/* ==========================================================================
   ZINOO PORTFOLIO - PREMIUM DESIGN SYSTEM & STYLES
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. ROOT VARIABLES & SPACING SCALE (8pt Grid System)
   -------------------------------------------------------------------------- */
:root {
  /* Accent Colors */
  --primary-color: #28e98c;
  --primary-rgb: 40, 233, 140;
  --primary-hover: #1fce7c;
  --primary-text: var(--primary-text-dark, #28e98c);

  /* Spacing Scale */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  /* Backgrounds */
  --bg-dark: #111318;
  --bg-surface: rgba(255, 255, 255, 0.028);
  --bg-surface-hover: rgba(255, 255, 255, 0.055);
  --bg-sidebar: rgba(13, 15, 20, 0.92);
  --bg-input: rgba(255, 255, 255, 0.04);

  /* Typography Colors (High Contrast WCAG AA Compliant) */
  --text-primary: #f3f4f6;
  --text-secondary: #9da3af;
  --text-tertiary: #767d8d;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);

  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0,0,0,0.28), 0 20px 48px rgba(0,0,0,0.32);
  --shadow-glow: 0 0 30px rgba(var(--primary-rgb), 0.16);
  --shadow-btn: 0 8px 24px rgba(var(--primary-rgb), 0.28);

  /* Radii */
  --radius-xs: 8px;
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --radius-pill: 999px;

  /* Fonts */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Motion */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.0, 0, 0.2, 1);
  --dur-fast: 200ms;
  --dur-normal: 380ms;
  --dur-slow: 600ms;
}

/* --------------------------------------------------------------------------
   2. GLOBAL RESET
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
}

/* --------------------------------------------------------------------------
   ACCESSIBILITY & FOCUS VISIBLE (WCAG 2.4.7)
   -------------------------------------------------------------------------- */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
  box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.25);
}

.social-btn:focus-visible,
.nav-link:focus-visible,
.mode-btn:focus-visible,
.theme-color-btn:focus-visible,
.color-dot:focus-visible,
.modal-close-btn:focus-visible,
.testimonial-dot:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  border-radius: var(--radius-pill);
}

.sidebar-action-btn:focus-visible,
.resume-btn:focus-visible,
.filter-btn:focus-visible,
.submit-btn:focus-visible,
.service-link:focus-visible,
.modal-footer-btn:focus-visible,
.switcher-toggle:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.35);
}

.project-card:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 4px;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-color); }

/* --------------------------------------------------------------------------
   3. LAYOUT
   -------------------------------------------------------------------------- */
.app-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
  display: grid;
  grid-template-columns: 340px 1fr 72px;
  gap: var(--space-5);
  position: relative;
  z-index: 1;
  align-items: start;
}

/* --------------------------------------------------------------------------
   4. LEFT PROFILE SIDEBAR
   -------------------------------------------------------------------------- */
.left-sidebar {
  position: sticky;
  top: var(--space-5);
  height: calc(100vh - 96px);
  max-height: 860px;
  background: var(--bg-sidebar);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  box-shadow: var(--shadow-card);
  z-index: 10;
  overflow: hidden;
}

.left-sidebar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.14), transparent);
  pointer-events: none;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-logo {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.4px;
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--text-primary);
  text-decoration: none;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.sidebar-logo:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

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

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(var(--primary-rgb), 0.25);
  background: rgba(var(--primary-rgb), 0.08);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--primary-text);
  letter-spacing: 0.3px;
}

.status-dot {
  flex-shrink: 0;
  width: 7px;
  height: 7px;
  background: var(--primary-color);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--primary-color);
  animation: pulse-dot 2.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.85); }
}

.profile-img-wrap {
  flex-shrink: 0;
  width: 176px;
  height: 176px;
  margin: var(--space-1) auto 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1.5px solid var(--border-medium);
  box-shadow: var(--shadow-glow);
  transition: transform var(--dur-normal) var(--ease-spring),
              border-color var(--dur-fast) var(--ease-out);
}

.profile-img-wrap:hover {
  border-color: rgba(var(--primary-rgb), 0.6);
  transform: translateY(-5px);
}

.profile-img-wrap img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
}

.profile-details {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.profile-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.4px;
  line-height: 1.2;
}

.profile-title {
  font-size: 0.86rem;
  color: var(--primary-text);
  font-weight: 600;
  letter-spacing: 0.3px;
}

.profile-location {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  margin-top: 5px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-1);
  margin-top: var(--space-1);
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--dur-fast) var(--ease-out);
}

.social-btn:hover {
  color: var(--primary-color);
  border-color: rgba(var(--primary-rgb), 0.35);
  background: rgba(var(--primary-rgb), 0.08);
  transform: translateY(-3px);
}

.sidebar-action-btn {
  margin-top: auto;
  width: 100%;
  padding: 14px var(--space-3);
  background: var(--primary-color);
  color: #0b0d10;
  font-weight: 700;
  font-size: 0.93rem;
  letter-spacing: 0.2px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: all var(--dur-fast) var(--ease-out);
}

.sidebar-action-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(var(--primary-rgb), 0.38);
}

/* --------------------------------------------------------------------------
   5. RIGHT FLOATING NAV RAIL
   -------------------------------------------------------------------------- */
.right-nav {
  position: sticky;
  top: 50%;
  transform: translateY(-50%);
  height: fit-content;
  background: var(--bg-sidebar);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-3) 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  box-shadow: var(--shadow-card);
  z-index: 20;
}

.nav-item { position: relative; }

.nav-link {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--dur-fast) var(--ease-out);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background: rgba(var(--primary-rgb), 0.1);
}

.nav-link::after {
  content: attr(data-tooltip);
  position: absolute;
  right: 52px;
  top: 50%;
  transform: translateY(-50%) translateX(8px);
  background: var(--bg-sidebar);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 5px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--dur-fast) var(--ease-out);
  pointer-events: none;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.nav-link:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

/* --------------------------------------------------------------------------
   6. MAIN CONTENT AREA
   -------------------------------------------------------------------------- */
.main-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding: 0 0 var(--space-6);
}

.content-section { scroll-margin-top: var(--space-5); }

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.3px;
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

.section-tag i {
  color: var(--primary-text);
  font-size: 0.95rem;
}

.section-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.2px;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.section-title span { color: var(--primary-text); }

.section-desc {
  font-size: 1.03rem;
  color: var(--text-secondary);
  line-height: 1.78;
  max-width: 620px;
}

/* --------------------------------------------------------------------------
   7. HERO SECTION
   -------------------------------------------------------------------------- */
.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: 0;
}

.hero-heading {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.8px;
  color: var(--text-primary);
}

.hero-heading .highlight { color: var(--primary-text); }

.hero-subtext {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.78;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-3);
  transition: all var(--dur-normal) var(--ease-spring);
}

.stat-card:hover {
  border-color: rgba(var(--primary-rgb), 0.3);
  background: var(--bg-surface-hover);
  transform: translateY(-4px);
}

.stat-num {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--primary-text);
  line-height: 1;
  margin-bottom: 7px;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

/* --------------------------------------------------------------------------
   8. ABOUT SECTION
   -------------------------------------------------------------------------- */
.about-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.about-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  pointer-events: none;
}

.about-text {
  font-size: 1.04rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: var(--space-4);
}

.info-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.info-label {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 600;
}

.info-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   9. RESUME / TIMELINE
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1.5px;
  background: linear-gradient(to bottom, var(--border-medium), transparent);
}

.timeline-item { position: relative; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-4));
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 2px solid var(--text-tertiary);
  transition: all var(--dur-fast) var(--ease-out);
}

.timeline-item:hover::before {
  border-color: var(--primary-color);
  background: var(--primary-color);
  box-shadow: 0 0 14px rgba(var(--primary-rgb), 0.6);
}

.timeline-date {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-text);
  text-transform: uppercase;
  letter-spacing: 0.9px;
  margin-bottom: var(--space-1);
}

.timeline-role {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.3px;
}

.timeline-company {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

.timeline-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.72;
}

/* --------------------------------------------------------------------------
   10. SERVICES
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: all var(--dur-normal) var(--ease-spring);
}

.service-card:hover {
  border-color: rgba(var(--primary-rgb), 0.28);
  background: var(--bg-surface-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.service-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: rgba(var(--primary-rgb), 0.1);
  border: 1px solid rgba(var(--primary-rgb), 0.25);
  color: var(--primary-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.65rem;
  margin-bottom: var(--space-1);
}

.service-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.service-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.service-projects-count {
  font-size: 0.74rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 600;
  margin-top: var(--space-1);
}

/* --------------------------------------------------------------------------
   11. SKILLS
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
}

.skill-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  transition: all var(--dur-normal) var(--ease-spring);
}

.skill-card:hover {
  border-color: rgba(var(--primary-rgb), 0.28);
  background: var(--bg-surface-hover);
  transform: translateY(-6px);
}

.skill-icon { font-size: 2.3rem; color: var(--primary-text); line-height: 1; }
.skill-name { font-size: 0.88rem; font-weight: 700; color: var(--text-primary); }
.skill-percent { font-size: 1.05rem; font-weight: 800; color: var(--primary-text); }

/* --------------------------------------------------------------------------
   12. PORTFOLIO / PROJECTS
   -------------------------------------------------------------------------- */
.portfolio-filter {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}

.filter-btn:hover,
.filter-btn.active {
  color: #0b0d10;
  background: var(--primary-color);
  border-color: var(--primary-color);
  font-weight: 700;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--dur-normal) var(--ease-spring);
}

.project-card:hover {
  border-color: rgba(var(--primary-rgb), 0.28);
  transform: translateY(-8px);
  box-shadow: var(--shadow-card);
}

.project-thumb {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: #161820;
}

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

.project-card:hover .project-thumb img { transform: scale(1.06); }

.project-tags {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag-pill {
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  background: rgba(10, 12, 18, 0.82);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}

.tag-pill.badge-public {
  background: rgba(var(--primary-rgb), 0.18);
  border-color: rgba(var(--primary-rgb), 0.45);
  color: var(--primary-text);
  font-weight: 700;
  box-shadow: 0 0 14px rgba(var(--primary-rgb), 0.2);
}

.project-community-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--primary-text);
  margin-top: 2px;
}

.project-body {
  padding: var(--space-3) var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex-grow: 1;
}

.project-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.2px;
  margin-top: var(--space-1);
}

.project-desc {
  font-size: 0.89rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: 1px solid var(--border-subtle);
  align-items: center;
}

.project-detail-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(var(--primary-rgb), 0.14);
  border: 1px solid rgba(var(--primary-rgb), 0.35);
  color: var(--primary-text);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.2px;
  transition: all var(--dur-fast) var(--ease-spring);
}

.project-detail-btn:hover {
  background: var(--primary-color);
  color: #0b0d10;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(var(--primary-rgb), 0.35);
}

.project-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--dur-fast) var(--ease-out);
}

.project-link-btn:hover {
  color: var(--text-primary);
  border-color: rgba(var(--primary-rgb), 0.3);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   13. TESTIMONIALS
   -------------------------------------------------------------------------- */
.testimonials-slider {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.testimonial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: all var(--dur-normal) var(--ease-spring);
}

.testimonial-card:hover {
  border-color: rgba(var(--primary-rgb), 0.22);
  background: var(--bg-surface-hover);
}

.quote-icon { font-size: 1.8rem; color: var(--primary-color); opacity: 0.55; }

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-style: italic;
  flex-grow: 1;
}

.client-info {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--border-subtle);
}

.client-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  object-fit: cover;
  border: 2px solid rgba(var(--primary-rgb), 0.28);
  flex-shrink: 0;
}

.client-name { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); }
.client-role { font-size: 0.78rem; color: var(--text-secondary); margin-top: 2px; }

/* --------------------------------------------------------------------------
   14. CONTACT FORM
   -------------------------------------------------------------------------- */
.contact-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.contact-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  pointer-events: none;
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.form-group { display: flex; flex-direction: column; gap: var(--space-1); }
.form-group.full-width { grid-column: span 2; }

.form-group label {
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: var(--text-secondary);
}

.form-group label span { color: var(--primary-color); }

.form-control {
  width: 100%;
  padding: 13px 17px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.93rem;
  transition: all var(--dur-fast) var(--ease-out);
}

.form-control::placeholder { 
  color: var(--text-tertiary); 
  opacity: 1;
}

.form-control:focus {
  border-color: rgba(var(--primary-rgb), 0.5);
  background: rgba(255,255,255,0.06);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

textarea.form-control { resize: vertical; min-height: 140px; line-height: 1.65; }

.submit-btn {
  padding: 15px var(--space-5);
  background: var(--primary-color);
  color: #0b0d10;
  font-weight: 700;
  font-size: 0.94rem;
  letter-spacing: 0.2px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  box-shadow: var(--shadow-btn);
  transition: all var(--dur-fast) var(--ease-out);
}

.submit-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(var(--primary-rgb), 0.38);
}

.form-alert {
  grid-column: span 2;
  padding: 13px var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.91rem;
  display: none;
}

.form-alert.success {
  display: block;
  background: rgba(var(--primary-rgb), 0.09);
  border: 1px solid rgba(var(--primary-rgb), 0.28);
  color: var(--primary-color);
}

.form-alert.error {
  display: block;
  background: rgba(255, 71, 87, 0.08);
  border: 1px solid rgba(255, 71, 87, 0.28);
  color: #ff4757;
}

/* --------------------------------------------------------------------------
   15. COLOR SWITCHER
   -------------------------------------------------------------------------- */
.color-switcher {
  position: fixed;
  left: var(--space-3);
  bottom: var(--space-3);
  z-index: 100;
}

.switcher-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: var(--bg-sidebar);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: all var(--dur-fast) var(--ease-out);
}

.switcher-toggle i { animation: spin-slow 10s linear infinite; }

@keyframes spin-slow { 100% { transform: rotate(360deg); } }

.switcher-toggle:hover {
  border-color: rgba(var(--primary-rgb), 0.4);
  transform: scale(1.08);
}

.switcher-panel {
  position: absolute;
  bottom: 56px;
  left: 0;
  background: var(--bg-sidebar);
  backdrop-filter: blur(24px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  width: 240px;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--dur-fast) var(--ease-out);
}

.switcher-panel.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.switcher-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1.1px;
  padding: 3px 2px;
}

.color-options { display: flex; gap: 8px; flex-wrap: wrap; padding: 3px 2px; }

.color-dot {
  width: 25px;
  height: 25px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  border: 2px solid transparent;
  display: inline-block;
  padding: 0;
  transition: all var(--dur-fast) var(--ease-out);
}

.color-dot:hover,
.color-dot.active {
  border-color: rgba(255, 255, 255, 0.8);
  transform: scale(1.18);
}

/* --------------------------------------------------------------------------
   16. SCROLL ANIMATION
   -------------------------------------------------------------------------- */
.scroll-anim {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-spring),
              transform var(--dur-slow) var(--ease-spring);
}

.scroll-anim.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   17. RESPONSIVE BREAKPOINTS
   -------------------------------------------------------------------------- */
@media (max-width: 1280px) {
  .app-container {
    grid-template-columns: 300px 1fr;
    gap: var(--space-4);
  }

  .right-nav {
    position: fixed;
    bottom: max(var(--space-3), env(safe-area-inset-bottom));
    top: auto;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    border-radius: var(--radius-pill);
    padding: 10px var(--space-3);
    gap: var(--space-1);
    z-index: 999;
    width: max-content;
    max-width: 90vw;
    overflow-x: auto;
  }

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

@media (max-width: 992px) {
  .app-container {
    grid-template-columns: 1fr;
    padding: var(--space-3) var(--space-3) 120px;
  }

  .left-sidebar {
    position: relative;
    top: 0;
    height: auto;
    max-height: none;
    margin-bottom: var(--space-2);
  }

  .color-switcher {
    bottom: 100px;
    z-index: 1000;
  }

  .services-grid,
  .projects-grid,
  .testimonials-slider { grid-template-columns: 1fr; }

  .skills-grid { grid-template-columns: repeat(3, 1fr); }

  .hero-heading { font-size: 2.6rem; }
  .section-title { font-size: 2.2rem; }

  .contact-form { grid-template-columns: 1fr; }
  .form-group.full-width, .submit-btn { grid-column: span 1; }
}

@media (max-width: 576px) {
  .app-container { padding: var(--space-2) var(--space-2) 110px; }

  .right-nav {
    padding: 8px 12px;
    gap: 4px;
    border-radius: var(--radius-pill);
    max-width: 96vw;
  }

  .nav-link {
    width: 40px;
    height: 40px;
    font-size: 1.15rem;
  }

  .social-btn {
    width: 44px;
    height: 44px;
  }

  .color-switcher {
    bottom: 90px;
    left: var(--space-2);
  }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }

  .stat-card { padding: var(--space-2); }
  .stat-num { font-size: 2rem; }
  .stat-label { font-size: 0.72rem; }

  .hero-heading { font-size: 2.1rem; letter-spacing: -1px; }
  .section-title { font-size: 1.9rem; letter-spacing: -0.8px; }

  .about-box,
  .contact-box,
  .service-card,
  .project-body,
  .testimonial-card { padding: var(--space-4) var(--space-3); }
}

/* --------------------------------------------------------------------------
   LIGHT MODE STYLES & OVERRIDES
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  --bg-dark: #f0f2f5;
  --bg-surface: #ffffff;
  --bg-surface-hover: #eef2f6;
  --bg-sidebar: rgba(255, 255, 255, 0.98);
  --bg-input: rgba(0, 0, 0, 0.04);
  
  --primary-text: var(--primary-text-light, #047857);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.14);
  
  --shadow-card: 0 4px 14px rgba(0, 0, 0, 0.06), 0 12px 28px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 25px rgba(var(--primary-rgb), 0.18);
}

[data-theme="light"] .right-nav {
  background: rgba(255, 255, 255, 0.96);
  border-color: rgba(0, 0, 0, 0.12);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .nav-link {
  color: #64748b;
}

[data-theme="light"] .nav-link:hover,
[data-theme="light"] .nav-link.active {
  color: var(--primary-color);
  background: rgba(var(--primary-rgb), 0.15);
}

[data-theme="light"] .nav-link::after {
  background: #ffffff;
  color: #0f172a;
  border-color: rgba(0, 0, 0, 0.12);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .tag-pill {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(0, 0, 0, 0.12);
  color: #0f172a;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .tag-pill.badge-public {
  background: rgba(var(--primary-rgb), 0.22);
  border-color: rgba(var(--primary-rgb), 0.55);
  color: #047857;
}

[data-theme="light"] .project-thumb {
  background: #e2e8f0;
}

[data-theme="light"] .project-link-btn {
  background: #f1f5f9;
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

[data-theme="light"] .project-link-btn:hover {
  color: var(--primary-color);
  background: #ffffff;
  border-color: rgba(var(--primary-rgb), 0.45);
}

[data-theme="light"] .social-btn {
  background: #f8fafc;
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

[data-theme="light"] .social-btn:hover {
  background: rgba(var(--primary-rgb), 0.12);
  border-color: rgba(var(--primary-rgb), 0.4);
  color: var(--primary-color);
}

[data-theme="light"] .filter-btn {
  background: #ffffff;
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

[data-theme="light"] .filter-btn:hover,
[data-theme="light"] .filter-btn.active {
  background: var(--primary-color);
  color: #0b0d10;
  border-color: var(--primary-color);
}

[data-theme="light"] .service-icon {
  background: rgba(var(--primary-rgb), 0.12);
  border-color: rgba(var(--primary-rgb), 0.3);
}

[data-theme="light"] .switcher-panel {
  background: rgba(255, 255, 255, 0.98);
  border-color: var(--border-medium);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .mode-toggle {
  background: #f1f5f9;
  border-color: var(--border-subtle);
}

[data-theme="light"] .timeline-item::before {
  background: #ffffff;
  border-color: #94a3b8;
}

[data-theme="light"] .timeline::before {
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.15), transparent);
}

[data-theme="light"] .stat-card,
[data-theme="light"] .about-box,
[data-theme="light"] .service-card,
[data-theme="light"] .skill-card,
[data-theme="light"] .project-card,
[data-theme="light"] .contact-box {
  background: #ffffff;
  border-color: var(--border-subtle);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .form-control {
  background: #f8fafc;
  border-color: var(--border-medium);
  color: #0f172a;
}

[data-theme="light"] .form-control:focus {
  background: #ffffff;
}

.mode-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  background: var(--bg-dark);
  padding: 5px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
}

.mode-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-main);
  padding: 8px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--dur-fast) var(--ease-out);
}

.mode-btn.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.mode-btn i {
  font-size: 1.2rem;
}

[data-theme="light"] #bg-canvas {
  opacity: 0.85;
  mix-blend-mode: darken;
}

/* --------------------------------------------------------------------------
   PREFERS REDUCED MOTION (WCAG 2.2 / 2.3.3)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .scroll-anim {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  #bg-canvas {
    opacity: 0.25;
  }
}