/* ============================================
   ThamaTek — Dark Theme Styles
   Visual style matched to ai.google.dev
   ============================================ */

/* ---------- CSS Variables / Theme Tokens ---------- */
:root {
  /* Colors — dark palette with purple tint */
  --color-bg: #06060a;
  --color-bg-elevated: #0e1019;
  --color-bg-card: #11121c;
  --color-bg-card-hover: #181a28;
  --color-surface: #151724;
  --color-surface-alt: #1b1e30;
  --color-border: #2b2f45;
  --color-border-hover: #3d4260;

  --color-text: #ffffff;
  --color-text-secondary: #9a9ec0;
  --color-text-muted: #636888;

  /* Blue-purple accent system */
  --color-primary: #5b6cf0;
  --color-primary-light: #7b8aff;
  --color-primary-soft: #8f9dff;
  --color-accent: #a78bfa;
  --color-accent-soft: #c4b5fd;

  /* Multi-color gradient (logo/branding) */
  --gradient-brand: linear-gradient(90deg, #4f6ef0 0%, #7c5bf5 40%, #c084fc 70%, #f472b6 100%);
  --gradient-blue: linear-gradient(135deg, #818cf8 0%, #6d28d9 50%, #4f46e5 100%);
  --gradient-btn: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a78bfa 100%);

  /* Glow */
  --glow-primary: 0 0 40px rgba(124, 58, 237, 0.2);
  --glow-card: 0 1px 2px 0 rgba(60, 50, 90, 0.3), 0 1px 3px 1px rgba(60, 50, 90, 0.15);
  --glow-card-hover: 0 4px 24px rgba(124, 58, 237, 0.15), 0 1px 3px rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, Helvetica, sans-serif;
  --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: 2.25rem;
  --font-size-4xl: 3rem;
  --font-size-5xl: 3.5rem;

  /* Spacing */
  --section-padding: 7rem 2.5rem;
  --container-max: 1200px;

  /* Borders */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 16px;
  --radius-xl: 32px;
  --radius-full: 99em;

  /* Transitions — cubic-bezier like Google's */
  --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-in-out);
  --transition-slow: 400ms var(--ease-in-out);

  /* Header */
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.65;
  letter-spacing: 0.01em;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

ul {
  list-style: none;
}

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

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

/* ---------- Page Loader ---------- */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s var(--ease-in-out), visibility 0.5s var(--ease-in-out);
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-logo {
  animation: loaderPulse 1.2s var(--ease-in-out) infinite;
}

@keyframes loaderPulse {
  0%, 100% { opacity: 0.4; transform: scale(0.96); }
  50% { opacity: 1; transform: scale(1); }
}

/* ---------- Scroll Reveal System ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Utility Classes ---------- */
.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Navigation ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(6, 6, 10, 0.75);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid rgba(43, 47, 69, 0.5);
  height: var(--header-height);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.site-header.scrolled {
  background: rgba(6, 6, 10, 0.92);
  border-bottom-color: var(--color-border);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: var(--font-size-xl);
  font-weight: 400;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-logo .logo-icon {
  transition: filter 0.3s var(--ease-in-out), transform 0.3s var(--ease-in-out);
  filter: drop-shadow(0 2px 8px rgba(124, 58, 237, 0.25));
}

.nav-logo:hover .logo-icon {
  filter: drop-shadow(0 4px 16px rgba(124, 58, 237, 0.45));
  transform: scale(1.05);
}

.nav-logo span {
  font-weight: 400;
}

.nav-logo span strong {
  font-weight: 700;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--color-border);
  border-radius: var(--radius-full);
  padding: 4px;
}

.nav-link {
  padding: 0.5rem 1.125rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

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

.nav-link.active {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav-toggle {
  display: none;
  color: var(--color-text);
  padding: 0.5rem;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  background: var(--color-surface);
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-border);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), transform 0.3s var(--ease-in-out);
  flex-shrink: 0;
  margin-left: 0.5rem;
}

.theme-toggle:hover {
  background: var(--color-border-hover);
  color: var(--color-text);
  transform: rotate(15deg);
}

/* Sun icon visible in dark mode, moon icon visible in light mode */
.theme-icon--light {
  display: none;
}

[data-theme="light"] .theme-icon--dark {
  display: none;
}

[data-theme="light"] .theme-icon--light {
  display: block;
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
  --color-bg: #f9f8fc;
  --color-bg-elevated: #ffffff;
  --color-bg-card: #ffffff;
  --color-bg-card-hover: #f3f0fa;
  --color-surface: #f0eef8;
  --color-surface-alt: #e9e6f4;
  --color-border: #ddd8ec;
  --color-border-hover: #c5bfda;

  --color-text: #1a1625;
  --color-text-secondary: #4b4660;
  --color-text-muted: #9590a8;

  --color-primary: #6d28d9;
  --color-primary-light: #7c3aed;
  --color-primary-soft: #7c3aed;
  --color-accent: #6d28d9;
  --color-accent-soft: #8b5cf6;

  --gradient-brand: linear-gradient(90deg, #4f46e5 0%, #7c3aed 40%, #c084fc 70%, #f472b6 100%);
  --gradient-blue: linear-gradient(135deg, #6d28d9 0%, #7c3aed 50%, #8b5cf6 100%);
  --gradient-btn: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a78bfa 100%);

  --glow-primary: 0 0 40px rgba(124, 58, 237, 0.1);
  --glow-card: 0 1px 3px 0 rgba(100, 60, 160, 0.06), 0 1px 2px -1px rgba(100, 60, 160, 0.05);
  --glow-card-hover: 0 8px 30px rgba(124, 58, 237, 0.1), 0 2px 6px rgba(0, 0, 0, 0.05);
}

/* Light theme header */
[data-theme="light"] .site-header {
  background: rgba(249, 248, 252, 0.8);
  border-bottom-color: rgba(221, 216, 236, 0.6);
}

[data-theme="light"] .site-header.scrolled {
  background: rgba(249, 248, 252, 0.95);
  border-bottom-color: var(--color-border);
}

/* Light theme nav links pill bar */
[data-theme="light"] .nav-links {
  background: var(--color-surface);
}

[data-theme="light"] .nav-link.active {
  background: var(--color-bg-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* Light theme mobile menu */
[data-theme="light"] .nav-links.open {
  background: rgba(249, 248, 252, 0.98);
}

/* Light hero bg */
[data-theme="light"] .hero-glow {
  background:
    radial-gradient(ellipse 60% 50% at 50% 20%, rgba(109, 40, 217, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 25% 45%, rgba(192, 132, 252, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 75% 40%, rgba(79, 70, 229, 0.04) 0%, transparent 60%);
}

/* Light theme cards have soft shadow */
[data-theme="light"] .about-card,
[data-theme="light"] .why-card,
[data-theme="light"] .blog-card {
  box-shadow: var(--glow-card);
}

[data-theme="light"] .contact-form {
  box-shadow: var(--glow-card);
}

/* Light theme form inputs */
[data-theme="light"] .form-group input,
[data-theme="light"] .form-group textarea {
  background: var(--color-bg);
}

/* Light theme tech stack */
[data-theme="light"] .tech-stack-section {
  background: var(--color-bg-elevated);
}

/* Light theme CTA banner */
[data-theme="light"] .cta-banner {
  background:
    radial-gradient(ellipse 70% 50% at 50% 50%, rgba(124, 58, 237, 0.04) 0%, transparent 70%),
    var(--color-bg);
}

/* Light theme page loader */
[data-theme="light"] .page-loader {
  background: var(--color-bg);
}

/* Light theme footer */
[data-theme="light"] .site-footer {
  background: #eeedf5;
}

[data-theme="light"] .footer-glow {
  background: radial-gradient(ellipse at center, rgba(124, 58, 237, 0.04) 0%, transparent 70%);
}

/* Light theme back-to-top */
[data-theme="light"] .back-to-top {
  background: var(--color-bg-elevated);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* Light theme blog search */
[data-theme="light"] .blog-search {
  background: var(--color-bg-elevated);
}

/* Light theme scrollbar */
[data-theme="light"] ::-webkit-scrollbar-track {
  background: var(--color-bg);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: var(--color-border);
}

[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* Light theme selection */
[data-theme="light"] ::selection {
  background: rgba(124, 58, 237, 0.18);
  color: var(--color-text);
}

/* ---------- Sections Base ---------- */
.section {
  padding: var(--section-padding);
  padding-top: calc(var(--header-height) + 5rem);
  opacity: 0;
  transform: translateY(48px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

/* Per-section backgrounds — subtle tint shifts for depth */
.section-services {
  background: #080712;
}

.section-about {
  background: #0a0a14;
}

.section-blog {
  background: #07080f;
}

.section-contact {
  background: #0b0916;
}

[data-theme="light"] .section-services {
  background: #f5f2fb;
}

[data-theme="light"] .section-about {
  background: #f8f6fd;
}

[data-theme="light"] .section-blog {
  background: #f3f1f9;
}

[data-theme="light"] .section-contact {
  background: #f6f4fc;
}

/* Hero is always visible (no scroll-in needed) */
.section-home {
  opacity: 1;
  transform: none;
}

/* CTA banner + tech stack also transition in */
.cta-banner,
.tech-stack-section {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.cta-banner.section-visible,
.tech-stack-section.section-visible {
  opacity: 1;
  transform: translateY(0);
}

.section-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4.5rem;
}

.section-tag {
  display: inline-block;
  padding: 0.4rem 1.125rem;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.18);
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.section-desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---------- Hero Section ---------- */
.section-home {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-height);
  overflow: hidden;
  min-height: 100vh;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: url('hero-bg.svg') center center / cover no-repeat;
}

/* Soft orb accents */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle 320px at 20% 30%, rgba(79, 70, 229, 0.12) 0%, transparent 100%),
    radial-gradient(circle 280px at 80% 60%, rgba(167, 139, 250, 0.10) 0%, transparent 100%),
    radial-gradient(circle 200px at 55% 15%, rgba(196, 132, 252, 0.08) 0%, transparent 100%);
  pointer-events: none;
}

[data-theme="light"] .hero-bg {
  background-image: url('hero-bg-light.svg');
}

[data-theme="light"] .hero-bg::after {
  background:
    radial-gradient(circle 320px at 20% 30%, rgba(79, 70, 229, 0.06) 0%, transparent 100%),
    radial-gradient(circle 280px at 80% 60%, rgba(167, 139, 250, 0.05) 0%, transparent 100%),
    radial-gradient(circle 200px at 55% 15%, rgba(196, 132, 252, 0.04) 0%, transparent 100%);
}

.hero-bg canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-glow {
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 80%;
  background:
    radial-gradient(ellipse 60% 50% at 50% 20%, rgba(124, 58, 237, 0.14) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 25% 45%, rgba(167, 139, 250, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 75% 40%, rgba(79, 70, 229, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 860px;
  padding: 2.5rem;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  margin-bottom: 2.5rem;
  letter-spacing: 0.04em;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  line-height: 1.08;
  margin-bottom: 1.75rem;
  letter-spacing: -0.035em;
  color: var(--color-text);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 3rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 2rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all 0.25s var(--ease-in-out);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  border: none;
  box-shadow: 0 2px 12px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 24px rgba(124, 58, 237, 0.45);
  transform: translateY(-2px) scale(1.02);
  filter: brightness(1.1);
  color: #fff;
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-border-hover);
  color: var(--color-text);
  transform: translateY(-1px);
}

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

.btn-lg {
  padding: 1.125rem 2.75rem;
  font-size: var(--font-size-base);
}

/* ---------- Tech Stack Section ---------- */
.tech-stack-section {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  overflow: hidden;
}

.tech-stack-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  overflow: hidden;
}

.tech-stack-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.tech-stack-marquee {
  display: flex;
  width: 100%;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
  mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
}

.tech-stack-logos {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-shrink: 0;
  padding-right: 1.25rem;
  animation: techScroll 30s linear infinite;
}

.tech-stack-marquee:hover .tech-stack-logos {
  animation-play-state: paused;
}

@keyframes techScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

.tech-stack-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  padding: 0.625rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: rgba(124, 58, 237, 0.03);
  transition: color 0.25s var(--ease-in-out), border-color 0.25s var(--ease-in-out), background 0.25s var(--ease-in-out);
  white-space: nowrap;
  flex-shrink: 0;
}

.tech-stack-item svg {
  color: var(--color-accent);
  opacity: 0.7;
  transition: opacity 0.25s var(--ease-in-out);
}

.tech-stack-item:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(124, 58, 237, 0.08);
}

.tech-stack-item:hover svg {
  opacity: 1;
}

/* ---------- Services Section — Card Grid ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* --- Service Card --- */
.svc-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s var(--ease-in-out), border-color 0.35s var(--ease-in-out), box-shadow 0.35s var(--ease-in-out);
}

.svc-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--glow-card-hover);
}

/* Image */
.svc-card-img {
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 9;
  background: #0a0918;
}

.svc-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s var(--ease-out);
}

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

/* Body */
.svc-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.svc-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.svc-card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-radius: var(--radius-sm);
  color: var(--color-primary-soft);
  flex-shrink: 0;
}

.svc-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.svc-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

/* Feature list */
.svc-card-features {
  list-style: none;
  margin: 0 0 1.5rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.svc-card-features li {
  position: relative;
  padding-left: 1.25rem;
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.svc-card-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient-blue);
}

/* CTA */
.svc-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast), gap 0.25s var(--ease-in-out);
  margin-top: auto;
}

.svc-card-cta:hover {
  color: var(--color-primary-light);
  gap: 0.75rem;
}

.svc-card-cta svg {
  transition: transform 0.25s var(--ease-in-out);
}

.svc-card-cta:hover svg {
  transform: translateX(2px);
}

/* --- Light theme --- */
[data-theme="light"] .svc-card {
  box-shadow: var(--glow-card);
}

[data-theme="light"] .svc-card:hover {
  box-shadow: var(--glow-card-hover);
}

[data-theme="light"] .svc-card-img {
  background: #ffffff;
}

[data-theme="light"] .svc-card-img img {
  opacity: 0.9;
  filter: brightness(1.4) saturate(0.9);
  mix-blend-mode: multiply;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .services-grid {
    gap: 1.25rem;
  }

  .svc-card-body {
    padding: 1.25rem;
  }

  .svc-card-title {
    font-size: var(--font-size-base);
  }
}

@media (max-width: 600px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- About Section ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 6rem;
}

.about-grid--two {
  grid-template-columns: repeat(2, 1fr);
}

.about-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 2.25rem;
  transition: all 0.3s var(--ease-in-out);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.about-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
}

/* Illustration inside about card */
.about-card-illustration {
  margin: -2.25rem -2.25rem 1.5rem -2.25rem;
  padding: 1.25rem 1.5rem;
  background: rgba(124, 58, 237, 0.04);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-card-illustration svg {
  width: 100%;
  max-width: 280px;
  height: auto;
}

[data-theme="light"] .about-card-illustration {
  background: rgba(124, 58, 237, 0.03);
}

.about-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(167, 139, 250, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  color: var(--color-accent);
}

.about-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.about-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.values-list {
  list-style: none;
}

.values-list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.75;
  padding: 0.4rem 0;
}

.values-list li strong {
  color: var(--color-text);
}

/* Why ThamaTek */
.why-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.why-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 2.25rem;
  transition: all 0.3s var(--ease-in-out);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.why-card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.why-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-blue);
  opacity: 0;
  transition: opacity 0.3s var(--ease-in-out);
}

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

.why-card:hover::before {
  opacity: 1;
}

.why-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  background: var(--gradient-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.why-card h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 0.625rem;
  letter-spacing: -0.01em;
}

.why-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* ---------- Blog Section ---------- */
.blog-controls {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.blog-search {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.875rem 1.25rem;
  max-width: 420px;
  transition: border-color var(--transition-fast);
  color: var(--color-text-muted);
}

.blog-search:focus-within {
  border-color: var(--color-primary);
}

.blog-search input {
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  width: 100%;
}

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

.blog-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.blog-tag {
  padding: 0.4rem 1rem;
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.blog-tag:hover {
  border-color: var(--color-border-hover);
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.03);
}

.blog-tag.active {
  background: var(--gradient-btn);
  border-color: transparent;
  color: #fff;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.blog-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all 0.3s var(--ease-in-out);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--glow-card-hover);
  background: var(--color-bg-card-hover);
}

.blog-card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.blog-card-tag {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(124, 58, 237, 0.08);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.blog-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.blog-card-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: 0.875rem;
}

.blog-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.75;
  flex: 1;
}

.blog-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: 1.25rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.blog-card-link:hover {
  color: var(--color-primary-soft);
}

.blog-expanded {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.blog-empty {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  padding: 4rem 0;
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  padding: 5rem 2.5rem;
  text-align: center;
  background:
    radial-gradient(ellipse 70% 50% at 50% 50%, rgba(124, 58, 237, 0.08) 0%, transparent 70%),
    var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta-container {
  max-width: 680px;
  margin: 0 auto;
}

.cta-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.cta-desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-text-secondary);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s var(--ease-in-out), visibility 0.3s var(--ease-in-out), transform 0.3s var(--ease-in-out), background 0.2s var(--ease-in-out), border-color 0.2s var(--ease-in-out);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

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

.back-to-top:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border-hover);
  color: var(--color-text);
}

/* ---------- Contact Section ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3.5rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

.contact-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-radius: var(--radius-sm);
  color: var(--color-primary-soft);
}

.contact-item h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 0.375rem;
}

.contact-item a,
.contact-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

/* Contact Form */
.contact-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.75rem;
}

.form-group {
  margin-bottom: 1.75rem;
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}

.required {
  color: var(--color-primary-soft);
}

.optional {
  color: var(--color-text-muted);
  font-weight: 400;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1.125rem;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.12);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ee4d5d;
}

.form-error {
  display: block;
  font-size: var(--font-size-xs);
  color: #ee4d5d;
  margin-top: 0.375rem;
  min-height: 1rem;
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

.form-success {
  text-align: center;
  padding: 2.5rem;
}

.form-success svg {
  color: var(--color-accent);
  margin: 0 auto 1.25rem;
}

.form-success h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-success p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.form-countdown {
  margin-top: 1rem;
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  font-variant-numeric: tabular-nums;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: 4.5rem 2.5rem 0;
  position: relative;
  overflow: hidden;
}

.footer-glow {
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 160px;
  background: radial-gradient(ellipse at center, rgba(124, 58, 237, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3.5rem;
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: 1rem;
  max-width: 300px;
  line-height: 1.7;
}

.footer-links h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 1.125rem;
  color: var(--color-text);
}

.footer-links li {
  margin-bottom: 0.625rem;
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 1.75rem 0;
  text-align: center;
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ---------- Form Loading State ---------- */
.btn-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.8;
}

.btn-loading .btn-text {
  visibility: hidden;
}

.btn-loading .btn-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: btnSpin 0.6s linear infinite;
}

@keyframes btnSpin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.form-success {
  animation: successFadeIn 0.5s var(--ease-out);
}

@keyframes successFadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Blog Tag Count ---------- */
.blog-tag-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  font-size: 0.625rem;
  font-weight: 700;
  background: rgba(124, 58, 237, 0.15);
  color: var(--color-accent);
  border-radius: 9px;
  padding: 0 4px;
  margin-left: 4px;
}

.blog-tag.active .blog-tag-count {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

.animate-in {
  animation: fadeInUp 0.5s var(--ease-out) forwards;
}

.animate-in:nth-child(1) { animation-delay: 0s; }
.animate-in:nth-child(2) { animation-delay: 0.08s; }
.animate-in:nth-child(3) { animation-delay: 0.16s; }
.animate-in:nth-child(4) { animation-delay: 0.24s; }
.animate-in:nth-child(5) { animation-delay: 0.32s; }
.animate-in:nth-child(6) { animation-delay: 0.40s; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .about-grid,
  .about-grid--two {
    grid-template-columns: 1fr;
  }

  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-container {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --section-padding: 4.5rem 1.25rem;
  }

  .nav-container {
    padding: 0 1.25rem;
  }

  .nav-toggle {
    display: block;
    order: 3;
  }

  .theme-toggle {
    order: 2;
    margin-left: auto;
    margin-right: 0.5rem;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(6, 6, 10, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 1.25rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

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

  .nav-link {
    width: 100%;
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
  }

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

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

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

  .tech-stack-container {
    gap: 1rem;
    text-align: center;
  }

  .tech-stack-logos {
    gap: 0.75rem;
  }

  .tech-stack-item {
    padding: 0.5rem 1rem;
  }

  .cta-banner {
    padding: 3.5rem 1.25rem;
  }

  .footer-container {
    grid-template-columns: 1fr;
  }

  .contact-form {
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 1.875rem;
    --font-size-4xl: 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

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

/* ---------- Selection ---------- */
::selection {
  background: rgba(124, 58, 237, 0.3);
  color: var(--color-text);
}