/* ============================================
   PORTFOLIO — Complete Design System
   Dual-theme (Light + Dark), system fonts,
   responsive, accessible, modern badge design.
   ============================================ */

/* ============================================
   COLOR PALETTE GUIDE
   ============================================
   
   CURRENT PALETTE (Warm Amber / Stone):
   
   Light Mode:
   --text:    #1c1917 (Stone 900)
   --bg:      #fafaf9 (Stone 50)
   --primary: #f59f0a (Amber 500 - Main Accent)
   --secondary: #f5f5f4 (Stone 100 - Surface)
   
   Dark Mode:
   --text:    #e8e5e3 (Warm Grey)
   --bg:      #0c0a09 (Stone 950 - Deep Warm Black)
   --primary: #f59f0a (Amber 500 - Main Accent)
   --secondary: #1c1917 (Stone 900 - Surface)
   
   ============================================ */

/* ============================================
   🎨 QUICK COLOR CUSTOMIZATION
   Changes here affect the entire site theming
   ============================================ */
:root {
  /* LIGHT MODE BASE COLORS */
  --light-bg: #fafaf9;
  --light-text: #1c1917;
  --light-accent: #f59f0a;

  /* DARK MODE BASE COLORS */
  --dark-bg: #0c0a09;
  --dark-text: #e8e5e3;
  --dark-accent: #f59f0a;

  /* Pure colors */
  --color-white: #ffffff;
  --color-black: #000000;
}

/* ============================================
   Auto-generated accent variations
   ============================================ */
/* Defined within blocks below */

/* ============================================
   1. CSS Custom Properties — Light Theme (Default)
   ============================================ */
:root {
  /* Base Accent for Light Mode (Warm Amber) */
  --accent-base: #f59f0a;
  --accent-base-hover: #d97706;
  /* Amber 600 */

  /* Alpha variations */
  --accent-alpha-10: color-mix(in srgb, var(--accent-base) 10%, transparent);
  --accent-alpha-15: color-mix(in srgb, var(--accent-base) 15%, transparent);
  --accent-alpha-20: color-mix(in srgb, var(--accent-base) 20%, transparent);
  --accent-alpha-30: color-mix(in srgb, var(--accent-base) 30%, transparent);
  --accent-alpha-50: color-mix(in srgb, var(--accent-base) 50%, transparent);

  /* Background - Warm Stone */
  --bg-primary: #fafaf9;
  --bg-surface: #f5f5f4;
  --bg-surface-hover: #e7e5e4;
  --bg-input: var(--color-white);
  --bg-nav: rgba(250, 250, 249, 0.95);
  --bg-nav-scrolled: rgba(250, 250, 249, 0.98);

  /* Text - Warm Stone */
  --text-primary: #1c1917;
  --text-secondary: #44403c;
  /* Stone 700 - User's secondary/accent */
  --text-muted: #78716c;
  /* Stone 500 */
  /* Stone 500 */
  --text-link: #d97706;
  /* Darker amber to match Dark Mode hue but accessible */

  /* Accent */
  --accent: #f59f0a;
  --accent-hover: #d97706;
  --accent-glow: rgba(245, 159, 10, 0.15);
  --accent-subtle: rgba(245, 159, 10, 0.08);

  /* Borders */
  --border: #e7e5e4;
  /* Stone 200 */
  --border-hover: var(--accent-alpha-30);
  --border-input: #d6d3d1;
  /* Stone 300 */

  /* Badges */
  /* Badges - Matching Dark Mode Structure (Surface + Border) */
  --badge-bg: #f5f5f4;
  --badge-border: #e7e5e4;
  --badge-hover-bg: #e7e5e4;
  --badge-hover-shadow: 0 4px 16px rgba(245, 159, 10, 0.15);

  /* Feedback */
  --success: #15803d;
  --success-bg: rgba(21, 128, 61, 0.1);
  --error: #b91c1c;
  --error-bg: rgba(185, 28, 28, 0.1);

  /* Success variations */
  --success-alpha-20: rgba(21, 128, 61, 0.2);
  --success-alpha-70: rgba(21, 128, 61, 0.7);
  --success-alpha-80: rgba(21, 128, 61, 0.8);

  /* Error variations */
  --error-alpha-20: rgba(185, 28, 28, 0.2);

  /* Shadows - Warm Amber Tinted */
  --shadow-card: 0 4px 12px rgba(245, 159, 10, 0.08);
  --shadow-nav: 0 2px 8px rgba(245, 159, 10, 0.06);
  --shadow-glow: 0 4px 24px rgba(245, 159, 10, 0.25);

  /* Typography — System Font Stack */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radii */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-badge: 1.25rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Hover Shadows - Pure Amber */
  --shadow-hover: 0 4px 16px var(--accent-alpha-20);
  --shadow-card-hover: 0 12px 32px var(--accent-alpha-15), 0 0 16px var(--accent-alpha-15);

  /* Layout */
  --nav-height: 4rem;
  --container-max: 72rem;
  --container-narrow: 42rem;

  /* Scrollbar */
  --scrollbar-track: #fafaf9;
  --scrollbar-thumb: #d6d3d1;
  --scrollbar-thumb-hover: #f59f0a;

  /* Selection */
  --selection-bg: rgba(245, 159, 10, 0.25);
  --selection-text: #1c1917;

  /* Button primary */
  --btn-submit-bg: #1c1917;
  --btn-submit-text: #ffffff;
  --btn-submit-hover-bg: #f59f0a;
  --btn-submit-hover-text: #000000;

  /* Timeline */
  --timeline-date-color: #57534e;
  /* Stone 600 - Matches Dark Mode Stone 400 inverse */
  --timeline-gpa-color: rgba(21, 128, 61, 1);
  /* Solid text for visibility */

  /* Nav Alpha */
  --nav-bg-alpha: rgba(250, 250, 249, 0.95);
  --nav-bg-scrolled-alpha: rgba(250, 250, 249, 0.98);
}

/* ============================================
   2. Dark Theme Overrides
   ============================================ */
[data-theme="dark"] {
  /* Base Accent for Dark Mode (Warm Amber) */
  --accent-base: #f59f0a;
  --accent-base-hover: #fbbf24;

  /* Alpha variations */
  --accent-alpha-10: color-mix(in srgb, var(--accent-base) 10%, transparent);
  --accent-alpha-15: color-mix(in srgb, var(--accent-base) 15%, transparent);
  --accent-alpha-20: color-mix(in srgb, var(--accent-base) 20%, transparent);
  --accent-alpha-30: color-mix(in srgb, var(--accent-base) 30%, transparent);
  --accent-alpha-50: color-mix(in srgb, var(--accent-base) 50%, transparent);

  /* Background - Deep Warm Black */
  --bg-primary: #0c0a09;
  /* Stone 950 */
  --bg-surface: #1c1917;
  /* Stone 900 */
  --bg-surface-hover: #292524;
  /* Stone 800 */
  --bg-input: #1c1917;

  /* Navigation for dark */
  --nav-bg-alpha: rgba(12, 10, 9, 0.85);
  --nav-bg-scrolled-alpha: rgba(12, 10, 9, 0.95);

  --bg-nav: var(--nav-bg-alpha);
  --bg-nav-scrolled: var(--nav-bg-scrolled-alpha);

  /* Text */
  --text-primary: #e8e5e3;
  /* Warm White */
  --text-secondary: #c3bfbb;
  /* Stone 300 - User's accent/secondary */
  --text-muted: #78716c;
  /* Stone 500 */
  --text-link: #fbbf24;

  /* Accent */
  --accent: #f59f0a;
  --accent-hover: #fbbf24;

  /* Dark mode accent variations */
  --accent-glow: rgba(245, 159, 10, 0.2);
  --accent-subtle: rgba(245, 159, 10, 0.1);

  /* Borders */
  --border: #292524;
  /* Stone 800 */
  --border-hover: var(--accent-alpha-30);
  --border-input: #44403c;
  /* Stone 700 */

  /* Badges */
  --badge-bg: #1c1917;
  --badge-border: #292524;
  --badge-hover-bg: #292524;
  --badge-hover-shadow: 0 4px 20px rgba(245, 159, 10, 0.2);

  /* Feedback */
  --success: #4ade80;
  --success-bg: rgba(74, 222, 128, 0.1);
  --error: #f87171;
  --error-bg: rgba(248, 113, 113, 0.1);

  /* Success variations dark */
  --success-alpha-20: rgba(74, 222, 128, 0.2);
  --success-alpha-70: rgba(74, 222, 128, 0.7);
  --success-alpha-80: rgba(74, 222, 128, 0.8);

  /* Error variations dark */
  --error-alpha-20: rgba(248, 113, 113, 0.2);

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.6);
  --shadow-nav: 0 1px 20px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 40px rgba(245, 159, 10, 0.2);

  --shadow-hover: 0 4px 16px var(--accent-alpha-30);
  --shadow-card-hover: 0 12px 32px rgba(0, 0, 0, 0.4), 0 0 20px var(--accent-alpha-15);

  /* Scrollbar */
  --scrollbar-track: #0c0a09;
  --scrollbar-thumb: #44403c;
  --scrollbar-thumb-hover: #f59f0a;

  /* Selection */
  --selection-bg: rgba(245, 159, 10, 0.3);
  --selection-text: #ffffff;

  /* Button primary */
  --btn-submit-bg: #e7e5e4;
  --btn-submit-text: #0c0a09;
  --btn-submit-hover-bg: #f59f0a;
  --btn-submit-hover-text: #000000;

  /* Timeline colors for dark mode */
  --timeline-date-color: #a8a29e;
  --timeline-gpa-color: rgba(74, 222, 128, 0.9);
}

/* ============================================
   3. Theme Transitions (enabled after first paint)
   ============================================ */
.theme-transitions,
.theme-transitions *,
.theme-transitions *::before,
.theme-transitions *::after {
  transition: background-color 0.3s ease,
    color 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease,
    fill 0.3s ease,
    stroke 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

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

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

ul,
ol {
  list-style: none;
}

/* ============================================
   5. Accessibility
   ============================================ */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  background: var(--accent);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
  color: var(--color-white);
}

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}

.hidden {
  display: none !important;
}

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

.honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

/* ============================================
   6. Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

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

/* ============================================
   8. Layout
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ============================================
   9. Navigation
   ============================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg-alpha);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

#navbar.scrolled {
  background: var(--nav-bg-scrolled-alpha);
  box-shadow: var(--shadow-nav);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

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

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

.nav-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link--accent {
  color: var(--text-link);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

.theme-toggle-btn:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-secondary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-menu-btn.open .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.open .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.open .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Right side of nav: theme toggle + hamburger */
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Mobile menu panel */
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--space-lg);
  gap: var(--space-md);
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}

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

.mobile-menu-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
}

.mobile-menu-link:hover {
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

/* ============================================
   10. Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-base);
  line-height: 1.4;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-alpha-30);
}

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

.btn-outline:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}

.btn-full {
  width: 100%;
  justify-content: center;
  padding: 1rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 700;
  border-radius: var(--radius-lg);
}

.btn-full.btn-primary {
  background: var(--btn-submit-bg);
  color: var(--btn-submit-text);
}

.btn-full.btn-primary:hover {
  background: var(--btn-submit-hover-bg);
  color: var(--btn-submit-hover-text);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.btn-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ============================================
   11. Hero Section
   ============================================ */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-4xl) var(--space-lg);
  border-bottom: 1px solid var(--border);
}

.hero-content {
  text-align: center;
  max-width: 48rem;
}

.hero-profile {
  margin-bottom: var(--space-xl);
}

.hero-avatar {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-full);
  border: 3px solid var(--border);
  object-fit: cover;
  margin: 0 auto;
  transition: border-color var(--transition-base);
}

.hero-avatar:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-alpha-30);
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.1;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-weight: 400;
}

.hero-bio {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 36rem;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.hero-social {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
}

.hero-social a {
  color: var(--text-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.hero-social a:hover {
  color: var(--text-link);
  transform: translateY(-2px);
}

.hero-social svg {
  width: 22px;
  height: 22px;
}

/* ============================================
   12. Sections
   ============================================ */
.section {
  padding: var(--space-4xl) 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: var(--nav-height);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.section-accent {
  width: 3.5rem;
  height: 3px;
  background: var(--accent);
  margin: 0 auto;
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-top: var(--space-xl);
}

/* ============================================
   13. About Section
   ============================================ */
.about-bio {
  font-size: 1.15rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 48rem;
  margin: 0 auto var(--space-2xl);
  line-height: 1.8;
}

.about-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: 40rem;
  margin: 0 auto;
}

@supports not (display: grid) {
  .about-details {
    display: flex;
    flex-wrap: wrap;
  }

  .about-details>* {
    flex: 1 1 45%;
    margin: var(--space-sm);
  }
}

.about-detail-item {
  display: flex;
  flex-direction: column;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}

.about-detail-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.about-detail-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  word-break: break-all;
}

.about-detail-value a {
  color: var(--text-link);
}

.about-detail-value a:hover {
  color: var(--accent-hover);
}

@media (max-width: 480px) {
  .about-details {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   14. Skills Section — Modern Badge Design
   ============================================ */
.skills-category {
  margin-bottom: var(--space-2xl);
}

.skills-category:last-child {
  margin-bottom: 0;
}

.skills-category-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--space-lg);
  position: relative;
  display: inline-block;
  width: 100%;
}

.skills-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--badge-bg);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-badge);
  border: 1px solid var(--badge-border);
  transition: all var(--transition-base);
  cursor: default;
}

.skill-badge:hover {
  background: var(--badge-hover-bg);
  transform: translateY(-2px);
  box-shadow: var(--badge-hover-shadow);
  border-color: var(--border-hover);
}

.skill-badge-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.skill-badge-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ============================================
   15. Projects Grid — Auto-Centering Layout
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 380px));
  justify-content: center;
  gap: var(--space-xl);
  width: 100%;
  max-width: calc((380px * 3) + (var(--space-xl) * 2));
  margin: 0 auto;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  width: 100%;
  max-width: 380px;
  transition: border-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

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

.project-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--border);
}

.project-card-body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

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

.project-card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-lg);
}

.tech-badge {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

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

.project-link--demo {
  color: var(--accent);
}

.project-link--demo:hover {
  color: var(--accent-hover);
}

.project-link svg {
  width: 16px;
  height: 16px;
}

/* Responsive: Tablet */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 350px));
  }

  .project-card {
    max-width: 350px;
  }
}

/* Responsive: Mobile */
@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .project-card {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .projects-grid {
    gap: var(--space-md);
  }
}

/* ============================================
   16. Experience / Timeline
   ============================================ */
.timeline {
  max-width: 48rem;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--bg-surface);
  border: 2px solid var(--accent);
  border-radius: var(--radius-full);
  z-index: 1;
}

.timeline-header {
  margin-bottom: var(--space-md);
}

.timeline-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.timeline-subtitle {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.85rem;
}

.timeline-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.timeline-meta-item svg {
  width: 14px;
  height: 14px;
}

.timeline-meta-item--date {
  color: var(--timeline-date-color);
  font-weight: 500;
}

/* Education GPA badge */
.timeline-meta-item--gpa {
  color: var(--timeline-gpa-color);
  font-weight: 600;
  background: var(--success-bg);
  padding: 2px 8px;
  border-radius: 12px;
}

.timeline-desc-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: var(--space-md);
}

.timeline-desc-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline-desc-item::before {
  content: '•';
  color: var(--accent);
  font-weight: bold;
}

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

.timeline-description {
  color: var(--text-secondary);
  margin-top: var(--space-sm);
}


/* ============================================
   17. Certifications
   ============================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.cert-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.cert-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.cert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.cert-issuer {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.cert-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: var(--space-md);
}

.cert-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.cert-meta-item svg {
  width: 14px;
  height: 14px;
}

.cert-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.cert-link:hover {
  text-decoration: underline;
}

.cert-link svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   18. Contact Section
   ============================================ */
.contact-card {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

@media (max-width: 600px) {
  .contact-card {
    padding: var(--space-lg);
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border-input);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

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

.form-input.error {
  border-color: var(--error);
  background: var(--error-bg);
}

.field-error {
  font-size: 0.8rem;
  color: var(--error);
  font-weight: 500;
}

.form-message {
  padding: 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
}

.form-message.success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-alpha-20);
}

.form-message.error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid var(--error-alpha-20);
}

/* ============================================
   19. Footer
   ============================================ */
.footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ============================================
   20. Animations
   ============================================ */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for grid items (up to 6) */
.animate-on-scroll:nth-child(1) {
  transition-delay: 0.1s;
}

.animate-on-scroll:nth-child(2) {
  transition-delay: 0.2s;
}

.animate-on-scroll:nth-child(3) {
  transition-delay: 0.3s;
}

.animate-on-scroll:nth-child(4) {
  transition-delay: 0.4s;
}

.animate-on-scroll:nth-child(5) {
  transition-delay: 0.5s;
}

.animate-on-scroll:nth-child(6) {
  transition-delay: 0.6s;
}

/* 🎨 THEME PRESETS - Uncomment to use
   
   Purple Theme:
   --accent-base: #8B5CF6;
   --accent-base-hover: #7C3AED;
   
   Teal Theme:
   --accent-base: #0D9488;
   --accent-base-hover: #0F766E;
   
   Emerald Theme:
   --accent-base: #10B981;
   --accent-base-hover: #059669;
*/