/* ==========================================================================
   MAHMUD YAQUBBHAI RAJPURA - PREMIUM DEVELOPER PORTFOLIO STYLES
   Design: Deep Navy, Refined Slate, Electric Blue Accents, Crisp Typography
   ========================================================================== */

:root {
  /* Color Palette - Light Mode */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-surface: #1e293b;
  --bg-surface-elevated: #283548;
  --bg-glass: rgba(15, 23, 42, 0.75);
  --bg-glass-card: rgba(30, 41, 59, 0.65);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(56, 189, 248, 0.4);
  --border-accent: rgba(56, 189, 248, 0.25);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-emerald: #10b981;
  --accent-purple: #a855f7;

  --gradient-brand: linear-gradient(135deg, #38bdf8 0%, #3b82f6 50%, #6366f1 100%);
  --gradient-subtle: linear-gradient(180deg, rgba(56, 189, 248, 0.08) 0%, rgba(15, 23, 42, 0) 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --header-height: 80px;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-card: rgba(255, 255, 255, 0.7);

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(37, 99, 235, 0.4);
  --border-accent: rgba(37, 99, 235, 0.2);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #f8fafc;

  --accent-cyan: #0284c7;
  --accent-blue: #2563eb;
  --accent-indigo: #4f46e5;
  --accent-emerald: #059669;
  --accent-purple: #9333ea;

  --gradient-brand: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #4f46e5 100%);
  --gradient-subtle: linear-gradient(180deg, rgba(37, 99, 235, 0.05) 0%, rgba(241, 245, 249, 0) 100%);
  --gradient-card: linear-gradient(135deg, rgba(0, 0, 0, 0.02) 0%, rgba(0, 0, 0, 0.005) 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.15);
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  background-color: var(--bg-primary);
  min-height: 100vh;
  position: relative;
}

/* Scroll progress indicator */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--gradient-brand);
  width: 0%;
  z-index: 9999;
  transition: width 0.1s linear;
}

/* Background canvas/grid */
.ambient-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  transition: transform 0.5s ease;
}

.ambient-orb-1 {
  width: 500px;
  height: 500px;
  background: #38bdf8;
  top: -100px;
  left: -100px;
}

.ambient-orb-2 {
  width: 600px;
  height: 600px;
  background: #6366f1;
  top: 40%;
  right: -150px;
}

.ambient-orb-3 {
  width: 450px;
  height: 450px;
  background: #10b981;
  bottom: 10%;
  left: 20%;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.7;
}

/* Common Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* Section Common Styles */
section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--border-accent);
  color: var(--accent-cyan);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-title .gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   HEADER & NAVIGATION (Refined Glassmorphism & Micro-Interactions)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border-bottom: 1px solid transparent;
  background: rgba(10, 14, 23, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

[data-theme="light"] .site-header {
  background: rgba(248, 250, 252, 0.6);
}

.site-header.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  height: 70px;
}

[data-theme="light"] .site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.brand-logo:hover {
  transform: translateY(-1px);
}

.brand-mark {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.4);
  overflow: hidden;
}

.brand-mark-glow {
  position: absolute;
  inset: -100%;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.4) 0%,
    rgba(255, 255, 255, 0) 60%
  );
  transform: rotate(45deg);
  pointer-events: none;
}

.brand-name {
  display: flex;
  flex-direction: column;
}

.brand-name span.name {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-name span.role {
  font-size: 0.72rem;
  color: var(--accent-cyan);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-top: 1px;
}

/* Nav Links Menu */
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.03);
  padding: 4px 8px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

[data-theme="light"] .nav-links {
  background: rgba(0, 0, 0, 0.03);
}

.mobile-sidebar-header,
.mobile-sidebar-footer {
  display: none;
}

.mobile-nav-scroll {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-icon-box {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.nav-icon-box svg {
  width: 17px;
  height: 17px;
  stroke: var(--accent-cyan);
  stroke-width: 2.2;
}

[data-theme="light"] .nav-icon-box svg {
  stroke: var(--accent-blue);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

[data-theme="light"] .nav-link:hover {
  background: rgba(0, 0, 0, 0.05);
}

.nav-link.active {
  color: #ffffff;
  background: var(--gradient-brand);
  font-weight: 700;
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.35);
}

.nav-link.active::after {
  display: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-talk-btn {
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.3);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: rotate(20deg) scale(1.05);
}

/* Mobile Hamburger Button with CSS Animation */
.mobile-menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  border-color: var(--accent-cyan);
}

.hamburger-box {
  width: 22px;
  height: 16px;
  position: relative;
  display: inline-block;
}

.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  position: absolute;
  transition: transform 0.25s ease-in-out, background-color 0.25s ease;
}

.hamburger-inner {
  top: 50%;
  transform: translateY(-50%);
}

.hamburger-inner::before {
  content: '';
  top: -7px;
}

.hamburger-inner::after {
  content: '';
  bottom: -7px;
}

.mobile-menu-toggle.active .hamburger-inner {
  background-color: transparent;
}

.mobile-menu-toggle.active .hamburger-inner::before {
  transform: translateY(7px) rotate(45deg);
  background-color: var(--accent-cyan);
}

.mobile-menu-toggle.active .hamburger-inner::after {
  transform: translateY(-7px) rotate(-45deg);
  background-color: var(--accent-cyan);
}

/* Mobile Nav Backdrop */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.mobile-nav-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  outline: none;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.35);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.05);
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-muted);
}

.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: rotate(15deg);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 80px;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-full);
  color: var(--accent-emerald);
  font-size: 0.8125rem;
  font-weight: 600;
  width: fit-content;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-role {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
}

.hero-tech-stack {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tech-stack-label {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.tech-badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tech-pill:hover {
  border-color: var(--border-focus);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* Hero Visual / Avatar Card */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-visual-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--gradient-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

.avatar-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-subtle);
}

.avatar-illustration {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  background: radial-gradient(circle at center, rgba(56, 189, 248, 0.15) 0%, rgba(15, 23, 42, 0.8) 70%);
}

.avatar-initials-badge {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.75rem;
  font-weight: 800;
  color: #ffffff;
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.4);
  margin-bottom: 16px;
}

.avatar-caption {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
}

.avatar-subcaption {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

.floating-badge {
  position: absolute;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  animation: float-slow 4s ease-in-out infinite;
  backdrop-filter: blur(8px);
}

.floating-badge-1 {
  top: -15px;
  right: -15px;
  animation-delay: 0s;
}

.floating-badge-2 {
  bottom: -15px;
  left: -15px;
  animation-delay: 2s;
}

@keyframes float-slow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ==========================================================================
   ABOUT ME SECTION
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: flex-start;
}

.about-text-col {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-text-col p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.75;
}

.about-highlights-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.about-highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.about-highlight-icon {
  width: 22px;
  height: 22px;
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

.about-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.info-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.info-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.info-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.info-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   TECHNICAL SKILLS SECTION
   ========================================================================== */
.skills-categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 24px;
}

.skill-category-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
}

.skill-category-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.category-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.category-level-badge {
  margin-left: auto;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 8px;
  border-radius: var(--radius-full);
}

.badge-strong {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-learning {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.skills-items-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.skill-item-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skill-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-level-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.skill-progress-bar {
  height: 6px;
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
}

[data-theme="light"] .skill-progress-bar {
  background: rgba(0, 0, 0, 0.06);
}

.skill-progress-fill {
  height: 100%;
  border-radius: 4px;
  background: var(--gradient-brand);
  transition: width 1s ease-out;
}

.skill-progress-fill.secondary {
  background: linear-gradient(90deg, #6366f1, #a855f7);
}

/* ==========================================================================
   EXPERIENCE SECTION (TIMELINE)
   ========================================================================== */
.experience-timeline {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  padding-left: 36px;
}

.experience-timeline::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 11px;
  width: 2px;
  background: var(--border-subtle);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  top: 6px;
  left: -36px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-dot::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.timeline-content-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
}

.timeline-content-card:hover {
  border-color: var(--border-focus);
  transform: translateX(4px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.timeline-role {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-company {
  font-size: 1rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-top: 2px;
}

.timeline-badge {
  font-size: 0.8125rem;
  padding: 4px 12px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  font-weight: 600;
}

.timeline-description {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.timeline-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.timeline-bullet {
  position: relative;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline-bullet::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: bold;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ==========================================================================
   FEATURED PROJECTS SECTION
   ========================================================================== */
.projects-controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 40px;
}

.projects-search-bar {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.9375rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 18px;
  height: 18px;
}

.filter-categories {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.filter-pill {
  padding: 8px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-pill:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.filter-pill.active {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #0f172a;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.project-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.project-banner {
  position: relative;
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.project-preview-mockup {
  width: 85%;
  height: 75%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  padding: 10px;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.project-card:hover .project-preview-mockup {
  transform: scale(1.04);
}

.mockup-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.mockup-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #64748b;
}

.mockup-dot:nth-child(1) { background: #ef4444; }
.mockup-dot:nth-child(2) { background: #f59e0b; }
.mockup-dot:nth-child(3) { background: #10b981; }

.mockup-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
}

.project-category-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  backdrop-filter: blur(4px);
}

.project-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 14px;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.project-description {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.project-modules-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.module-pill {
  font-size: 0.75rem;
  padding: 3px 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.project-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

.tech-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
}

.view-details-btn {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: none;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 6px 0;
}

.view-details-btn:hover {
  text-decoration: underline;
}

/* ==========================================================================
   APPLICATION ARCHITECTURE SHOWCASE
   ========================================================================== */
.architecture-container {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
  backdrop-filter: blur(12px);
}

.architecture-notice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  margin-bottom: 30px;
  font-size: 0.875rem;
  color: var(--accent-cyan);
}

.arch-interactive-diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  margin-bottom: 30px;
  overflow-x: auto;
  padding: 20px 0;
}

.arch-node {
  background: var(--bg-surface);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 170px;
}

.arch-node:hover, .arch-node.active-node {
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.25);
}

.arch-node-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.arch-node-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.arch-node-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.arch-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.arch-connector-line {
  width: 40px;
  height: 2px;
  background: var(--border-focus);
  position: relative;
}

.arch-connector-line::after {
  content: '';
  position: absolute;
  right: 0;
  top: -3px;
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--accent-cyan);
  border-right: 2px solid var(--accent-cyan);
  transform: rotate(45deg);
}

.arch-details-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-fast);
}

.arch-details-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.arch-details-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   SERVICES SECTION
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  transition: all var(--transition-normal);
}

.service-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.service-icon-box {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.service-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.service-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   EDUCATION SECTION
   ========================================================================== */
.education-timeline {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.education-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-start;
  gap: 24px;
  transition: all var(--transition-normal);
}

.education-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
}

.education-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.education-body {
  flex: 1;
}

.education-degree {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.education-status {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-full);
  color: var(--accent-emerald);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.education-institution {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   RESUME / CV SECTION
   ========================================================================== */
.resume-preview-card {
  max-width: 960px;
  margin: 0 auto;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg);
}

.resume-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 30px;
}

.resume-candidate-name {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
}

.resume-candidate-title {
  font-size: 1rem;
  color: var(--accent-cyan);
  font-weight: 600;
}

.resume-grid-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.resume-sub-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.resume-summary-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.resume-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.resume-tag {
  font-size: 0.8125rem;
  padding: 4px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.resume-download-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.resume-path-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: all var(--transition-normal);
}

.contact-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.contact-card-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}

.contact-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-action-btn {
  padding: 8px 14px;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.contact-action-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Contact Form with client-side verification */
.contact-form-container {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(8px);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input, .form-textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-feedback {
  display: none;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
}

.form-feedback.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
}

.form-feedback.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

/* ==========================================================================
   MODAL & LIGHTBOX
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  max-width: 780px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-backdrop.open .modal-dialog {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px;
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  z-index: 10;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.modal-content-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Lightbox Gallery Controls */
.gallery-viewer {
  position: relative;
  width: 100%;
  height: 280px;
  background: #090d16;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-subtle);
}

.gallery-screen-slide {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
  background: radial-gradient(circle at center, rgba(56, 189, 248, 0.1) 0%, #090d16 80%);
}

.gallery-screen-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 10px;
}

.gallery-screen-caption {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.gallery-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-subtle);
  color: #ffffff;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.gallery-nav-btn:hover {
  background: var(--accent-cyan);
  color: #0f172a;
}

.gallery-nav-prev { left: 12px; }
.gallery-nav-next { right: 12px; }

/* ==========================================================================
   FOOTER & BACK TO TOP
   ========================================================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px 0;
  position: relative;
}

.footer-top-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-tagline {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  max-width: 360px;
  line-height: 1.6;
}

.footer-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
}

.footer-bottom-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 30px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.back-to-top-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 999;
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.5);
}

/* Toast Notification */
.toast-notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-focus);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.toast-notice.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (Mobile 320px - Desktop 1920px)
   ========================================================================== */

/* Laptop & Medium Desktops (max-width: 1200px) */
@media (max-width: 1200px) {
  .nav-links {
    gap: 4px;
    padding: 3px 6px;
  }

  .nav-link {
    padding: 6px 10px;
    font-size: 0.775rem;
  }
}

/* Tablet Landscape & Small Laptops (max-width: 1024px) */
@media (max-width: 1024px) {
  :root {
    --header-height: 72px;
  }

  .nav-links {
    display: none; /* Handled by mobile drawer */
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }

  .hero-content {
    align-items: center;
  }

  .hero-description {
    margin: 0 auto;
    font-size: 1.05rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-tech-stack {
    align-items: center;
  }

  .tech-badges-list {
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .arch-interactive-diagram {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

  .arch-connector {
    display: none;
  }

  .arch-node {
    flex: 1 1 calc(33% - 16px);
    min-width: 200px;
  }
}

/* Mobile Devices & Tablet Portrait (max-width: 820px) */
@media (max-width: 820px) {
  :root {
    --header-height: 68px;
  }

  .site-header {
    height: 68px;
  }

  .site-header.scrolled {
    height: 64px;
  }

  /* Sleek Modern Mobile Side-Drawer */
  .nav-links {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    width: min(340px, 86vw);
    height: 100vh;
    height: 100dvh;
    background: #0f172a;
    border-left: 1px solid var(--border-subtle);
    border-radius: 0;
    flex-direction: column;
    padding: 0;
    gap: 0;
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.7);
    opacity: 0;
    visibility: hidden;
    transform: translateX(100%);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1001;
  }

  [data-theme="light"] .nav-links {
    background: #ffffff;
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.15);
  }

  .nav-links.open {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
  }

  /* Mobile Drawer Header */
  .mobile-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.02);
  }

  .mobile-brand-box {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .brand-mark.small {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
    border-radius: 10px;
  }

  .mobile-brand-text {
    display: flex;
    flex-direction: column;
  }

  .mobile-brand-text .m-name {
    font-size: 0.92rem;
    font-weight: 800;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
  }

  .mobile-brand-text .m-role {
    font-size: 0.7rem;
    color: var(--accent-cyan);
    font-weight: 600;
  }

  .mobile-menu-close-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
  }

  .mobile-menu-close-btn svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-primary);
    stroke-width: 2.2;
  }

  .mobile-menu-close-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
  }

  /* Mobile Navigation Links Scroll Area */
  .mobile-nav-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .nav-icon-box {
    display: inline-flex;
    margin-right: 12px;
  }

  .nav-link {
    width: 100%;
    text-align: left;
    padding: 10px 14px;
    font-size: 0.9375rem;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    color: var(--text-primary);
  }

  .nav-link .nav-text {
    font-weight: 600;
    color: var(--text-primary);
  }

  .nav-link:hover {
    background: var(--bg-surface);
    border-color: var(--border-subtle);
  }

  .nav-link:hover .nav-icon-box {
    background: var(--accent-cyan);
  }

  .nav-link:hover .nav-icon-box svg {
    stroke: #0f172a;
  }

  .nav-link.active {
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid var(--border-accent);
    color: var(--accent-cyan);
  }

  .nav-link.active .nav-icon-box {
    background: var(--gradient-brand);
    box-shadow: 0 2px 10px rgba(56, 189, 248, 0.4);
  }

  .nav-link.active .nav-icon-box svg {
    stroke: #ffffff;
  }

  .nav-link.active .nav-text {
    color: var(--accent-cyan);
    font-weight: 700;
  }

  /* Mobile Drawer Footer CTA */
  .mobile-sidebar-footer {
    display: flex;
    flex-direction: column;
    padding: 16px 20px 24px 20px;
    border-top: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.02);
  }

  .nav-talk-btn {
    display: none;
  }

  .hero-title {
    font-size: 2.6rem;
  }

  .hero-role {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .about-cards-grid {
    grid-template-columns: 1fr;
  }

  .resume-grid-preview {
    grid-template-columns: 1fr;
  }

  .resume-header-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-top-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* Small Smartphone Screen Widths (max-width: 480px) */
@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand-name span.name {
    font-size: 0.9rem;
  }

  .brand-name span.role {
    font-size: 0.65rem;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }

  .hero-title {
    font-size: 2rem;
    line-height: 1.2;
  }

  .hero-role {
    font-size: 0.95rem;
  }

  .hero-description {
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .section-subtitle {
    font-size: 0.95rem;
  }

  .btn {
    width: 100%;
    padding: 12px 18px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }

  .hero-visual-card {
    padding: 16px;
  }

  .floating-badge {
    position: static;
    margin-top: 10px;
    width: 100%;
    justify-content: center;
    animation: none;
  }

  .skills-categories-grid {
    grid-template-columns: 1fr;
  }

  .skill-category-card {
    padding: 20px 16px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .filter-categories {
    gap: 6px;
  }

  .filter-pill {
    padding: 6px 12px;
    font-size: 0.775rem;
  }

  .contact-card {
    flex-direction: column;
    align-items: stretch;
    padding: 18px 16px;
  }

  .contact-action-btn {
    width: 100%;
    justify-content: center;
  }

  .contact-form-container {
    padding: 20px 16px;
  }

  .resume-preview-card {
    padding: 24px 16px;
  }

  .architecture-container {
    padding: 20px 16px;
  }

  .arch-node {
    width: 100%;
    flex: 1 1 100%;
  }

  .modal-dialog {
    padding: 0;
  }

  .modal-header {
    padding: 16px 20px;
  }

  .modal-content-body {
    padding: 20px 16px;
  }

  .gallery-viewer {
    height: 220px;
  }
}