/* ========================================
   Namira Parvez Portfolio - Design System
   ======================================== */

/* ----- CSS Variables (Design Tokens) ----- */
:root {
  /* Colors - Light Mode */
  --color-primary: #5B4CDB;
  --color-primary-hover: #4A3CC9;
  --color-primary-light: #E8E5FA;
  --color-secondary: #6C63FF;
  --color-accent: #7C3AED;
  
  --color-bg: #FAFBFC;
  --color-bg-alt: #FFFFFF;
  --color-bg-card: #FFFFFF;
  --color-bg-code: #F3F4F6;
  
  --color-text: #1F2937;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-text-inverse: #FFFFFF;
  
  --color-border: #E5E7EB;
  --color-border-hover: #D1D5DB;
  
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Typography */
  --font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --font-family-mono: 'Fira Code', 'Source Code Pro', Consolas, monospace;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-Index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 300;
  --z-modal: 400;
  --z-tooltip: 500;
  
  /* Container */
  --container-max: 1200px;
  --container-padding: var(--space-6);
}

/* ----- Dark Mode ----- */
[data-theme="dark"] {
  --color-primary: #7C6EF6;
  --color-primary-hover: #8B7FF7;
  --color-primary-light: #2D2A4E;
  --color-secondary: #8B83FF;
  --color-accent: #A78BFA;
  
  --color-bg: #0F1117;
  --color-bg-alt: #1A1D27;
  --color-bg-card: #1F2330;
  --color-bg-code: #2A2E3B;
  
  --color-text: #F3F4F6;
  --color-text-secondary: #9CA3AF;
  --color-text-muted: #6B7280;
  --color-text-inverse: #1F2937;
  
  --color-border: #2E3340;
  --color-border-hover: #3F4554;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

/* ----- Typography ----- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ----- Layout ----- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding: var(--space-20) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  margin-bottom: var(--space-4);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: var(--space-6) auto 0;
}

/* ----- Header ----- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-list {
  display: flex;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  z-index: var(--z-modal);
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: var(--color-text);
}

.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }

[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

/* ----- Hero Section ----- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 76, 219, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(124, 58, 237, 0.1), transparent);
  z-index: -1;
}

[data-theme="dark"] .hero::before {
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 76, 219, 0.25), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(124, 58, 237, 0.15), transparent);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero-text {
  max-width: 600px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.hero-catch {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-8);
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-primary);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-graphic {
  width: 100%;
  max-width: 500px;
  aspect-ratio: 1;
  position: relative;
}

.hero-shape {
  position: absolute;
  border-radius: var(--radius-2xl);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  opacity: 0.1;
  animation: float 6s ease-in-out infinite;
}

.hero-shape:nth-child(1) {
  width: 80%;
  height: 80%;
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.hero-shape:nth-child(2) {
  width: 60%;
  height: 60%;
  top: 20%;
  left: 20%;
  opacity: 0.15;
  animation-delay: -2s;
}

.hero-shape:nth-child(3) {
  width: 40%;
  height: 40%;
  top: 30%;
  left: 30%;
  opacity: 0.2;
  animation-delay: -4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-text-inverse);
  border-color: transparent;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-text-inverse);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Link Button */
.btn-link {
  padding: var(--space-2);
  color: var(--color-primary);
  background: transparent;
}

.btn-link:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
}

/* ----- Project Cards ----- */
.projects-section {
  background: var(--color-bg);
}

.projects-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.search-box {
  flex: 1;
  min-width: 250px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-12);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
}

.filter-group {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.sort-select {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  cursor: pointer;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6);
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.project-thumbnail {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-code);
}

.project-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-thumbnail img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  align-items: flex-end;
  padding: var(--space-4);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-category {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
}

.project-content {
  padding: var(--space-5);
}

.project-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.project-catch {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-actions {
  display: flex;
  gap: var(--space-3);
}

/* ----- Tags ----- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  background: var(--color-bg-code);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
}

.tag-primary {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ----- Skills Section ----- */
.skills-section {
  background: var(--color-bg-alt);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.skill-category {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

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

.skill-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.skill-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.skill-category-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-4);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-item {
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.skill-item:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ----- About Section ----- */
.about-section {
  background: var(--color-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-12);
  align-items: start;
}

.about-image {
  position: relative;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: var(--color-bg-code);
}

.about-image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-xl);
  transform: translate(16px, 16px);
  z-index: -1;
}

.about-text h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-4);
}

.about-text p {
  margin-bottom: var(--space-4);
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.about-highlight {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.about-highlight-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.about-highlight-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

.about-highlight-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.about-highlight-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin: 0;
}

/* ----- Travel & Food Section ----- */
.travel-section {
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

.travel-section::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--color-primary-light), transparent);
  opacity: 0.5;
  z-index: 0;
}

.travel-header {
  text-align: center;
  margin-bottom: var(--space-8);
  position: relative;
  z-index: 1;
}

.travel-intro {
  max-width: 600px;
  margin: 0 auto var(--space-10);
  text-align: center;
  position: relative;
  z-index: 1;
}

.travel-intro p {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
}

.travel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
  position: relative;
  z-index: 1;
}

.travel-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.travel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.travel-card-image {
  aspect-ratio: 16 / 10;
  background: var(--color-bg-code);
  overflow: hidden;
}

.travel-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.travel-card-content {
  padding: var(--space-4);
}

.travel-card-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.travel-card-location {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.travel-card-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ----- Contact Section ----- */
.contact-section {
  background: var(--color-bg);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-12);
}

.contact-info h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-4);
}

.contact-links {
  margin-top: var(--space-6);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  transition: all var(--transition-fast);
}

.contact-link:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.contact-link-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-link-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

.contact-link-text {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

/* Contact Form */
.contact-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-label .required {
  color: var(--color-error);
  margin-left: var(--space-1);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

.form-submit {
  width: 100%;
}

/* ----- Footer ----- */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-8);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-logo {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.footer-social-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.footer-social-link:hover svg {
  color: white;
}

.footer-social-link svg {
  width: 18px;
  height: 18px;
  color: var(--color-text-secondary);
}

.footer-copyright {
  width: 100%;
  text-align: center;
  padding-top: var(--space-8);
  margin-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ----- Project Detail Page ----- */
.project-detail {
  padding-top: 72px;
}

.project-hero {
  background: var(--color-bg-alt);
  padding: var(--space-16) 0;
}

.project-hero-content {
  max-width: 800px;
}

.project-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  transition: color var(--transition-fast);
}

.project-back:hover {
  color: var(--color-primary);
}

.project-detail-category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.project-detail-title {
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
  margin-bottom: var(--space-4);
}

.project-detail-catch {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.project-meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.project-meta-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-meta-value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.project-links {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

/* Project Sections */
.project-section {
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-border);
}

.project-section:last-child {
  border-bottom: none;
}

.project-section-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.project-section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
}

.project-description {
  max-width: 800px;
}

.project-description p {
  margin-bottom: var(--space-4);
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.project-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.project-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  margin-top: 0.5em;
  flex-shrink: 0;
}

/* Tech Stack */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.tech-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.tech-item-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.tech-item-reason {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Gallery */
.project-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-4);
}

.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--color-bg-code);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Project Navigation */
.project-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  padding: var(--space-12) 0;
}

.project-nav-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-6);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-fast);
}

.project-nav-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.project-nav-item.next {
  text-align: right;
}

.project-nav-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-nav-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

/* ----- Animations ----- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Staggered Animation */
.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- Empty State ----- */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  color: var(--color-text-muted);
}

.empty-state-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

.empty-state-text {
  color: var(--color-text-muted);
}

/* ----- Responsive ----- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-text {
    max-width: 100%;
  }
  
  .hero-catch {
    border-left: none;
    padding-left: 0;
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: var(--space-4);
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-visual {
    display: none;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .about-image {
    max-width: 300px;
    margin: 0 auto;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: var(--space-4);
  }
  
  .header-inner {
    height: 64px;
  }
  
  .nav-list {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-alt);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: var(--z-dropdown);
  }
  
  .nav-list.active {
    transform: translateX(0);
  }
  
  .nav-link {
    font-size: var(--font-size-lg);
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .section {
    padding: var(--space-12) 0;
  }
  
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .about-highlights {
    grid-template-columns: 1fr;
  }
  
  .project-nav {
    grid-template-columns: 1fr;
  }
  
  .project-nav-item.next {
    text-align: left;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .filter-group {
    width: 100%;
    justify-content: center;
  }
}

/* ----- Focus Styles (Accessibility) ----- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ----- Skip Link (Accessibility) ----- */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: white;
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ----- Screen Reader Only ----- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ----- Placeholder Images ----- */
.placeholder-image {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-bg-code), var(--color-border));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}