/* ===================================
   JAHID Portfolio - Style Sheet
   Modern, Minimal, Travel-inspired
   =================================== */

/* ===================================
   CSS Custom Properties (Themes)
   =================================== */
:root {
  /* Light Theme (Default) */
  --color-bg: #fafafa;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f5f5f5;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-tertiary: #6b6b6b;
  --color-text-muted: #8a8a8a;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;
  
  /* Accent Colors - Teal/Blue-Green (Travel-inspired) */
  --color-accent: #0d9488;
  --color-accent-light: #14b8a6;
  --color-accent-dark: #0f766e;
  --color-accent-bg: rgba(13, 148, 136, 0.08);
  --color-accent-bg-hover: rgba(13, 148, 136, 0.12);
  
  /* Status Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.08), 0 16px 48px rgba(0, 0, 0, 0.06);
  
  /* Typography */
  --font-sans: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  
  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;
  
  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: #0f0f0f;
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #242424;
  --color-text: #f5f5f5;
  --color-text-secondary: #d4d4d4;
  --color-text-tertiary: #a3a3a3;
  --color-text-muted: #737373;
  --color-border: #2a2a2a;
  --color-border-light: #333333;
  
  --color-accent: #14b8a6;
  --color-accent-light: #2dd4bf;
  --color-accent-dark: #0d9488;
  --color-accent-bg: rgba(20, 184, 166, 0.12);
  --color-accent-bg-hover: rgba(20, 184, 166, 0.18);
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.4), 0 16px 48px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
}

ul,
ol {
  list-style: none;
}

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

/* Selection */
::selection {
  background-color: var(--color-accent-bg);
  color: var(--color-text);
}

/* ===================================
   Utility Classes
   =================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-accent);
  color: white;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  z-index: var(--z-toast);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-accent);
  color: white;
}

.btn--primary:hover {
  background-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--secondary {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background-color: var(--color-border);
  transform: translateY(-2px);
}

.btn--ghost {
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-bg);
}

.btn--full {
  width: 100%;
}

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

/* ===================================
   Header & Navigation
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: var(--z-sticky);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

[data-theme="dark"] .header {
  background-color: rgba(15, 15, 15, 0.8);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  text-decoration: none;
}

.nav__logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  border-radius: var(--radius-md);
  letter-spacing: -0.02em;
}

.nav__logo-text {
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-bg);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
}

.theme-toggle__icon--moon {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--sun {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--moon {
  display: block;
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  margin: 0 auto;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===================================
   Section Base Styles
   =================================== */
.section {
  padding: var(--space-24) 0;
}

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

.section__label {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  background-color: var(--color-accent-bg);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

.section__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

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

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__pattern {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 1px 1px, var(--color-border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.5;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 60% at 50% 0%, var(--color-accent-bg) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(13, 148, 136, 0.06) 0%, transparent 40%);
}

[data-theme="dark"] .hero__gradient {
  background: 
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(20, 184, 166, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(20, 184, 166, 0.08) 0%, transparent 40%);
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  padding-top: var(--header-height);
}

.hero__text {
  max-width: 600px;
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__label-line {
  display: block;
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, transparent 100%);
  border-radius: 1px;
}

.hero__title {
  margin-bottom: var(--space-6);
}

.hero__name {
  display: block;
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

.hero__role {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  margin-top: var(--space-2);
}

.hero__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-8);
}

.hero__description-sub {
  display: block;
  font-size: var(--font-size-base);
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
}

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

/* Hero Visual - Compass */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__compass {
  width: 300px;
  height: 300px;
  animation: float 6s ease-in-out infinite;
}

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

.compass-svg {
  width: 100%;
  height: 100%;
}

.compass-ring {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 1.5;
}

.compass-ring--inner {
  stroke-dasharray: 4 4;
  opacity: 0.5;
}

.compass-tick {
  stroke: var(--color-text-muted);
  stroke-width: 2;
}

.compass-needle--north {
  fill: var(--color-accent);
}

.compass-needle--south {
  fill: var(--color-text-muted);
}

.compass-center {
  fill: var(--color-bg-secondary);
  stroke: var(--color-border);
  stroke-width: 2;
}

.compass-label {
  font-size: 12px;
  font-weight: var(--font-weight-semibold);
  fill: var(--color-text-tertiary);
  text-anchor: middle;
  dominant-baseline: middle;
}

/* Scroll Indicator */
.hero__scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.hero__scroll:hover {
  color: var(--color-accent);
}

.hero__scroll-text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero__scroll-icon {
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(8px); }
  60% { transform: translateY(4px); }
}

/* ===================================
   About Section
   =================================== */
.about__content {
  display: grid;
  gap: var(--space-12);
}

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

.about__photo {
  flex-shrink: 0;
}

.about__photo-frame {
  position: relative;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.about__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  background-color: var(--color-bg-secondary);
}

.about__photo-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}

.about__text {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.about__intro {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-6);
}

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

.about__strengths {
  text-align: center;
}

.about__strengths-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-6);
}

/* Chip List */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.chip:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-bg);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* Travel Mindset */
.about__travel-mindset {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-8);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.about__travel-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-6);
}

.about__travel-accent {
  display: block;
  width: 4px;
  height: 24px;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: 2px;
}

.about__travel-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.about__travel-list li {
  text-align: left;
}

.about__travel-list strong {
  display: block;
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.about__travel-list span {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ===================================
   Projects Section
   =================================== */
.projects__controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.projects__search {
  position: relative;
  max-width: 400px;
  margin: 0 auto;
}

.projects__search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

.projects__search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-12);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.projects__search-input::placeholder {
  color: var(--color-text-muted);
}

.projects__search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-bg);
}

.projects__filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.filter-btn {
  padding: var(--space-2) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-btn.active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* Projects Grid */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-8);
}

.projects__empty {
  text-align: center;
  padding: var(--space-16) 0;
  color: var(--color-text-secondary);
}

/* Project Card */
.project-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-light);
}

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

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

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

.project-card__status {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-full);
}

[data-theme="dark"] .project-card__status {
  background-color: rgba(26, 26, 26, 0.9);
}

.project-card__status--live {
  color: var(--color-success);
}

.project-card__status--dev {
  color: var(--color-warning);
}

.project-card__status--archived {
  color: var(--color-text-muted);
}

.project-card__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
}

.project-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.project-card__summary {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
  flex: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.project-card__tag {
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
}

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

.project-card__btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.project-card__btn--primary {
  background-color: var(--color-accent);
  color: white;
}

.project-card__btn--primary:hover {
  background-color: var(--color-accent-dark);
}

.project-card__btn--secondary {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

.project-card__btn--secondary:hover {
  background-color: var(--color-border);
}

/* Placeholder Image */
.project-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent-bg) 0%, var(--color-bg-tertiary) 100%);
  color: var(--color-text-muted);
}

/* ===================================
   Skills Section
   =================================== */
.skills__content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-10);
}

.skills__category {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.skills__category-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-6);
}

.skills__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.skills__tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-bg);
  color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Legacy skill-item styles kept for reference, no longer used */
/*
.skill-item__header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.skill-item__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.skill-item__level {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.skill-item__bar {
  width: 100%;
  height: 6px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-item__progress {
  height: 100%;
  width: var(--progress);
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: var(--radius-full);
  transition: width 1s ease-out;
}
*/

/* Tags Section */
.skills__tags {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-8);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

.tag {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.tag:hover {
  background-color: var(--color-accent-bg);
  color: var(--color-accent);
}

/* ===================================
   Travels Section
   =================================== */
.travels__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

/* Trip Card */
.trip-card {
  position: relative;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.trip-card__image {
  aspect-ratio: 4 / 3;
  background-color: var(--color-bg-tertiary);
  overflow: hidden;
}

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

.trip-card:hover .trip-card__image img {
  transform: scale(1.05);
}

.trip-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent-bg) 0%, var(--color-bg-tertiary) 100%);
  color: var(--color-text-muted);
}

.trip-card__content {
  padding: var(--space-5);
}

.trip-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.trip-card__destination {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.trip-card__country {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-tertiary);
}

.trip-card__date {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.trip-card__note {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.trip-card__highlight {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-accent-bg);
  border-radius: var(--radius-sm);
}

.trip-card__highlight svg {
  flex-shrink: 0;
}

/* ===================================
   Contact Section
   =================================== */
.contact__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  max-width: 900px;
  margin: 0 auto;
}

/* Form Styles */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.required {
  color: var(--color-error);
}

.form-input,
.form-textarea {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

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

.form-input.error,
.form-textarea.error {
  border-color: var(--color-error);
}

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

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  min-height: 1.2em;
}

/* Contact Info */
.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact__card {
  padding: var(--space-6);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.contact__card-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-5);
}

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

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.contact__link:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-bg);
}

.contact__map-hint {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.contact__map-icon {
  color: var(--color-accent);
  flex-shrink: 0;
}

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

.footer__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer__tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ===================================
   Modal
   =================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.modal__container {
  position: relative;
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  animation: modal-in 0.3s ease;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  z-index: 1;
  transition: all var(--transition-fast);
}

.modal__close:hover {
  color: var(--color-text);
  background-color: var(--color-border);
}

.modal__content {
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-8);
}

/* Modal Project Detail */
.modal__project-image {
  aspect-ratio: 16 / 9;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

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

.modal__project-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
}

.modal__project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.modal__meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.modal__meta-item svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

.modal__project-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.modal__project-description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-6);
}

.modal__project-section {
  margin-bottom: var(--space-6);
}

.modal__project-section h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
}

.modal__project-section p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.modal__project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.modal__project-actions {
  display: flex;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ===================================
   Toast
   =================================== */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.3s ease;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast--success {
  border-left: 4px solid var(--color-success);
}

.toast--success .toast__icon {
  color: var(--color-success);
}

.toast--error {
  border-left: 4px solid var(--color-error);
}

.toast--error .toast__icon {
  color: var(--color-error);
}

.toast__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

/* ===================================
   Responsive Styles
   =================================== */

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
  
  .hero__content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero__cta {
    justify-content: center;
  }
  
  .hero__visual {
    display: none;
  }
  
  .skills__content {
    grid-template-columns: 1fr;
  }
  
  .contact__content {
    grid-template-columns: 1fr;
  }
  
  .about__travel-list {
    grid-template-columns: 1fr;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --space-24: 4rem;
    --space-20: 3.5rem;
    --space-16: 3rem;
    --header-height: 64px;
  }
  
  .container {
    padding: 0 var(--space-4);
  }
  
  /* Mobile Navigation */
  .nav__menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-8) var(--space-6);
    background-color: var(--color-bg);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    gap: var(--space-2);
  }
  
  .nav__menu.active {
    transform: translateX(0);
  }
  
  .nav__link {
    display: block;
    padding: var(--space-4);
    font-size: var(--font-size-lg);
    text-align: center;
  }
  
  .nav__toggle {
    display: flex;
  }
  
  /* Hero */
  .hero__name {
    font-size: var(--font-size-4xl);
  }
  
  .hero__role {
    font-size: var(--font-size-lg);
  }
  
  .hero__description {
    font-size: var(--font-size-base);
  }
  
  .hero__cta {
    flex-direction: column;
  }
  
  .hero__cta .btn {
    width: 100%;
  }
  
  /* About */
  .about__main {
    gap: var(--space-6);
  }
  
  .about__photo-frame {
    width: 150px;
    height: 150px;
  }
  
  .about__intro,
  .about__detail {
    text-align: left;
  }
  
  .about__intro br,
  .about__detail br {
    display: none;
  }
  
  .about__travel-mindset {
    padding: var(--space-6);
  }
  
  /* Projects */
  .projects__grid {
    grid-template-columns: 1fr;
  }
  
  .projects__controls {
    gap: var(--space-4);
  }
  
  .projects__filters {
    gap: var(--space-1);
  }
  
  .filter-btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }
  
  /* Travels */
  .travels__grid {
    grid-template-columns: 1fr;
  }
  
  /* Modal */
  .modal {
    padding: var(--space-4);
  }
  
  .modal__content {
    padding: var(--space-6);
  }
  
  .modal__project-actions {
    flex-direction: column;
  }
  
  /* Toast */
  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    bottom: var(--space-4);
  }
  
  /* Contact */
  .contact__content {
    gap: var(--space-8);
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .section__title {
    font-size: var(--font-size-2xl);
  }
  
  .about__photo-frame {
    width: 120px;
    height: 120px;
  }
  
  .chip-list {
    justify-content: flex-start;
  }
  
  .chip {
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-3);
  }
  
  .skill-tag {
    font-size: var(--font-size-xs);
    padding: var(--space-2) var(--space-4);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Print Styles */
@media print {
  .header,
  .hero__scroll,
  .theme-toggle,
  .nav__toggle,
  .modal,
  .toast-container {
    display: none !important;
  }
  
  .section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}