/* ============================================================
   AcadPro HK — 學術寫作協助服務
   商務專業風格：深藍 + 金色點綴
   ============================================================ */

/* === Google Fonts === */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&display=swap');

/* === Design Tokens === */
:root,
[data-theme='light'] {
  --color-bg: #f5f6f9;
  --color-surface: #ffffff;
  --color-surface-2: #eef0f5;
  --color-surface-offset: #e8eaf0;
  --color-border: #d0d4de;
  --color-divider: #e2e5ef;

  --color-text: #1a1e2e;
  --color-text-muted: #5a6080;
  --color-text-faint: #9aa0b8;
  --color-text-inverse: #f5f6f9;

  /* Navy primary */
  --color-primary: #1b2d6b;
  --color-primary-hover: #152256;
  --color-primary-active: #0f1940;
  --color-primary-highlight: #d0d6eb;

  /* Gold accent */
  --color-gold: #b8860b;
  --color-gold-light: #d4a017;
  --color-gold-highlight: #fdf3d7;

  /* Success / Error */
  --color-success: #2e7d32;
  --color-error: #c62828;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(27, 45, 107, 0.08);
  --shadow-md: 0 4px 16px rgba(27, 45, 107, 0.10);
  --shadow-lg: 0 12px 40px rgba(27, 45, 107, 0.14);

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Fonts */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'DM Sans', 'Helvetica Neue', sans-serif;

  /* Content widths */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:    1200px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme='dark'] {
  --color-bg: #0e1220;
  --color-surface: #141826;
  --color-surface-2: #1a1f30;
  --color-surface-offset: #1e2338;
  --color-border: #2e344e;
  --color-divider: #252b3e;

  --color-text: #e0e4f0;
  --color-text-muted: #8890b0;
  --color-text-faint: #555e7a;
  --color-text-inverse: #0e1220;

  --color-primary: #6b8fff;
  --color-primary-hover: #8aabff;
  --color-primary-active: #a8c3ff;
  --color-primary-highlight: #1e2844;

  --color-gold: #f0b429;
  --color-gold-light: #f9cb6a;
  --color-gold-highlight: #2d2410;

  --color-success: #4caf50;
  --color-error: #ef5350;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0e1220;
    --color-surface: #141826;
    --color-surface-2: #1a1f30;
    --color-surface-offset: #1e2338;
    --color-border: #2e344e;
    --color-divider: #252b3e;
    --color-text: #e0e4f0;
    --color-text-muted: #8890b0;
    --color-text-faint: #555e7a;
    --color-text-inverse: #0e1220;
    --color-primary: #6b8fff;
    --color-primary-hover: #8aabff;
    --color-primary-active: #a8c3ff;
    --color-primary-highlight: #1e2844;
    --color-gold: #f0b429;
    --color-gold-light: #f9cb6a;
    --color-gold-highlight: #2d2410;
    --color-success: #4caf50;
    --color-error: #ef5350;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.45);
  }
}

/* === Base Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
}
img, picture, video, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li { text-wrap: pretty; }
button { cursor: pointer; background: none; border: none; }
a { text-decoration: none; color: inherit; }
::selection { background: color-mix(in srgb, var(--color-primary) 25%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !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;
}

/* === Layout Utilities === */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}
.container--narrow { max-width: var(--content-narrow); }
.container--default { max-width: var(--content-default); }

/* === Navigation === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition-interactive);
}
.nav--scrolled { box-shadow: var(--shadow-md); }
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}
.nav__logo svg { flex-shrink: 0; }
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}
.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transition: transform var(--transition-interactive);
  border-radius: var(--radius-full);
}
.nav__links a:hover, .nav__links a.active { color: var(--color-text); }
.nav__links a:hover::after, .nav__links a.active::after { transform: scaleX(1); }
.nav__actions { display: flex; align-items: center; gap: var(--space-3); }

/* Theme toggle */
.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-2); }

/* Mobile menu button */
.nav__hamburger {
  display: none;
  flex-direction: column; justify-content: center; align-items: center;
  gap: 5px; width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.nav__hamburger span {
  display: block; width: 20px; height: 2px;
  background: currentColor; border-radius: 2px;
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile drawer */
.nav__mobile {
  display: none;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) 0 var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.nav__mobile.open { display: flex; }
.nav__mobile a {
  display: block; padding: var(--space-3) 0;
  font-size: var(--text-base); font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-divider);
  transition: color var(--transition-interactive);
}
.nav__mobile a:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .nav__cta { display: none; }
}

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm); font-weight: 600; letter-spacing: 0.02em;
  border-radius: var(--radius-md);
  transition: all var(--transition-interactive);
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary); color: #fff;
}
.btn--primary:hover { background: var(--color-primary-hover); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.btn--primary:active { background: var(--color-primary-active); transform: translateY(0); box-shadow: none; }

.btn--gold {
  background: var(--color-gold); color: #fff;
}
.btn--gold:hover { background: var(--color-gold-light); box-shadow: var(--shadow-md); transform: translateY(-1px); }

.btn--outline {
  background: transparent; color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn--outline:hover { background: var(--color-primary-highlight); }

.btn--ghost {
  background: transparent; color: var(--color-text-muted);
}
.btn--ghost:hover { color: var(--color-text); background: var(--color-surface-2); }

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

/* === Hero Section === */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 86vh;
  display: flex; align-items: center;
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  background: var(--color-surface);
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 60% at 70% 50%, color-mix(in srgb, var(--color-primary) 8%, transparent) 0%, transparent 70%);
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-gold);
  margin-bottom: var(--space-5);
}
.hero__eyebrow::before {
  content: '';
  display: block; width: 24px; height: 2px;
  background: var(--color-gold); border-radius: var(--radius-full);
}
.hero__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}
.hero__heading em { font-style: italic; color: var(--color-gold); }
.hero__subtext {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}
.hero__actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.hero__stats {
  display: flex; gap: var(--space-8);
  margin-top: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}
.hero__stat-num {
  font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: 700;
  color: var(--color-primary);
}
.hero__stat-label {
  font-size: var(--text-xs); color: var(--color-text-muted);
  letter-spacing: 0.05em; text-transform: uppercase; font-weight: 500;
  margin-top: var(--space-1);
}

/* Hero visual side */
.hero__visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3;
}
.hero__visual img {
  width: 100%; height: 100%; object-fit: cover;
}
.hero__badge {
  position: absolute; bottom: var(--space-5); left: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: var(--space-3);
}
.hero__badge-icon {
  width: 40px; height: 40px; border-radius: var(--radius-md);
  background: var(--color-gold-highlight);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.hero__badge-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}
.hero__badge-text strong {
  display: block;
  font-size: var(--text-sm); color: var(--color-text); font-weight: 600;
}

@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-height: 320px; }
  .hero { min-height: auto; }
}

/* === Section Shared === */
.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}
.section--alt { background: var(--color-surface); }
.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}
.section__eyebrow {
  display: inline-block;
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-gold);
  margin-bottom: var(--space-4);
}
.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-5);
}
.section__desc {
  font-size: var(--text-base); color: var(--color-text-muted);
  max-width: 56ch; margin-inline: auto; line-height: 1.7;
}

/* === Services Grid === */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  opacity: 0;
  transition: opacity var(--transition-interactive);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-highlight);
}
.service-card:hover::before { opacity: 1; }
.service-card__icon {
  width: 52px; height: 52px; border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; margin-bottom: var(--space-5);
  transition: background var(--transition-interactive);
}
.service-card:hover .service-card__icon { background: color-mix(in srgb, var(--color-primary) 15%, transparent); }
.service-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg); font-weight: 600;
  color: var(--color-text); margin-bottom: var(--space-3);
}
.service-card__desc { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.7; }
.service-card__tag {
  display: inline-block; margin-top: var(--space-4);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.05em;
  padding: var(--space-1) var(--space-3);
  background: var(--color-gold-highlight);
  color: var(--color-gold);
  border-radius: var(--radius-full);
}
[data-theme='dark'] .service-card__tag { color: var(--color-gold-light); }

/* === Process Steps === */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-2);
  position: relative;
}
.step {
  display: flex; flex-direction: column;
  align-items: center; text-align: center;
  padding: var(--space-8) var(--space-6);
  position: relative;
}
.step:not(:last-child)::after {
  content: '→';
  position: absolute; right: -10px; top: var(--space-8);
  font-size: 1.25rem; color: var(--color-text-faint);
}
.step__num {
  width: 56px; height: 56px; border-radius: var(--radius-full);
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700;
  margin-bottom: var(--space-5); flex-shrink: 0;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--color-primary) 35%, transparent);
}
.step__title { font-size: var(--text-base); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-2); }
.step__desc { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6; }

@media (max-width: 600px) {
  .step:not(:last-child)::after { display: none; }
}

/* === Testimonials === */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}
.testimonial-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
}
.testimonial-card::before {
  content: '"';
  position: absolute; top: var(--space-4); left: var(--space-6);
  font-family: var(--font-display); font-size: 4rem; font-weight: 700;
  color: var(--color-gold); opacity: 0.3; line-height: 1;
}
.testimonial-card__text {
  font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.75;
  margin-bottom: var(--space-6); padding-top: var(--space-6);
}
.testimonial-card__author { display: flex; align-items: center; gap: var(--space-3); }
.testimonial-card__avatar {
  width: 42px; height: 42px; border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-gold));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: var(--text-base); color: #fff; font-weight: 600;
  flex-shrink: 0;
}
.testimonial-card__name { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.testimonial-card__school { font-size: var(--text-xs); color: var(--color-text-faint); }
.stars { color: var(--color-gold); font-size: var(--text-sm); letter-spacing: 2px; margin-bottom: var(--space-2); }

/* === FAQ === */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); }
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-item__btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); padding: var(--space-5) var(--space-6);
  text-align: left;
  font-size: var(--text-base); font-weight: 600; color: var(--color-text);
  transition: background var(--transition-interactive);
}
.faq-item__btn:hover { background: var(--color-surface-2); }
.faq-item__btn svg {
  flex-shrink: 0; color: var(--color-text-muted);
  transition: transform var(--transition-interactive);
}
.faq-item.open .faq-item__btn svg { transform: rotate(180deg); }
.faq-item__body {
  display: none; padding: 0 var(--space-6) var(--space-5);
  font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.75;
}
.faq-item.open .faq-item__body { display: block; }

/* === Contact Form === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-16);
  align-items: start;
}
.contact-info__title {
  font-family: var(--font-display);
  font-size: var(--text-xl); font-weight: 700; color: var(--color-text);
  margin-bottom: var(--space-5);
}
.contact-info__desc { font-size: var(--text-base); color: var(--color-text-muted); line-height: 1.7; margin-bottom: var(--space-8); }
.contact-links { display: flex; flex-direction: column; gap: var(--space-4); }
.contact-link {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 500; color: var(--color-text);
  transition: all var(--transition-interactive);
}
.contact-link:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); color: var(--color-primary); }
.contact-link__icon {
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  background: var(--color-primary-highlight);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; flex-shrink: 0;
}

/* Form */
.form { display: flex; flex-direction: column; gap: var(--space-5); }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface); border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md); font-size: var(--text-sm); color: var(--color-text);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
  outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent);
}
.form-textarea { min-height: 140px; resize: vertical; }
.form-select { appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235a6080' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right var(--space-4) center;
  padding-right: var(--space-10);
}
.form-success {
  display: none;
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-sm); color: var(--color-success); font-weight: 500;
}
.form-success.show { display: block; }

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* === About Page === */
.about-hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  text-align: center;
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: center;
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}
.about-grid--reverse .about-content { order: 2; }
.about-grid--reverse .about-visual { order: 1; }
.about-visual {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 3/2;
  background: var(--color-surface-2);
}
.about-visual img { width: 100%; height: 100%; object-fit: cover; }
.about-content__label {
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-gold);
  margin-bottom: var(--space-4);
}
.about-content__title {
  font-family: var(--font-display);
  font-size: var(--text-xl); font-weight: 700; color: var(--color-text);
  margin-bottom: var(--space-5); line-height: 1.2;
}
.about-content__text { font-size: var(--text-base); color: var(--color-text-muted); line-height: 1.75; }
.about-content__text + .about-content__text { margin-top: var(--space-4); }

.values-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-5);
}
.value-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-6);
  text-align: center;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.value-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.value-card__icon { font-size: 2rem; margin-bottom: var(--space-4); }
.value-card__title { font-size: var(--text-base); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-2); }
.value-card__desc { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.65; }

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-grid--reverse .about-content, .about-grid--reverse .about-visual { order: unset; }
}

/* === Services Page === */
.services-hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  background: var(--color-surface);
  text-align: center;
  border-bottom: 1px solid var(--color-divider);
}
.pricing-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}
.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.pricing-card--featured {
  background: var(--color-primary); color: #fff;
  border-color: transparent;
}
.pricing-card--featured .pricing-card__price,
.pricing-card--featured .pricing-card__title { color: #fff; }
.pricing-card--featured .pricing-card__desc,
.pricing-card--featured .pricing-card__feature { color: rgba(255,255,255,0.75); }
.pricing-card--featured .pricing-card__divider { border-color: rgba(255,255,255,0.2); }
.pricing-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--color-gold); color: #fff;
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
  padding: var(--space-1) var(--space-4); border-radius: var(--radius-full);
}
.pricing-card__title { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-2); }
.pricing-card__desc { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-5); }
.pricing-card__price {
  font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 700;
  color: var(--color-primary); margin-bottom: var(--space-1);
}
.pricing-card__price-note { font-size: var(--text-xs); color: var(--color-text-faint); margin-bottom: var(--space-6); }
.pricing-card--featured .pricing-card__price { color: var(--color-gold-light); }
.pricing-card__divider { border: none; border-top: 1px solid var(--color-divider); margin-block: var(--space-5); }
.pricing-card__features { display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-6); }
.pricing-card__feature {
  display: flex; align-items: center; gap: var(--space-3);
  font-size: var(--text-sm); color: var(--color-text-muted);
}
.pricing-card__feature::before {
  content: '✓'; display: flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--color-success) 15%, transparent);
  color: var(--color-success); font-size: 0.7rem; font-weight: 700; flex-shrink: 0;
}
.pricing-card--featured .pricing-card__feature::before {
  background: rgba(255,255,255,0.2); color: #fff;
}

.samples-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}
.sample-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-6);
  display: flex; flex-direction: column;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.sample-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.sample-card__type {
  display: inline-block;
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em;
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  background: var(--color-primary-highlight); color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.sample-card__title { font-family: var(--font-display); font-size: var(--text-base); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-2); }
.sample-card__subject { font-size: var(--text-xs); color: var(--color-text-muted); margin-bottom: var(--space-4); }
.sample-card__grade {
  margin-top: auto; padding-top: var(--space-4); border-top: 1px solid var(--color-divider);
  display: flex; align-items: center; justify-content: space-between;
  font-size: var(--text-sm);
}
.sample-card__grade-label { color: var(--color-text-muted); }
.sample-card__grade-val { font-weight: 700; color: var(--color-gold); }

/* === CTA Banner === */
.cta-banner {
  background: var(--color-primary); color: #fff;
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  text-align: center;
  position: relative; overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 100%, rgba(255,255,255,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.cta-banner__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: 700; color: #fff;
  margin-bottom: var(--space-5);
}
.cta-banner__desc { font-size: var(--text-base); color: rgba(255,255,255,0.75); max-width: 52ch; margin-inline: auto; margin-bottom: var(--space-8); line-height: 1.65; }
.cta-banner .btn--gold { box-shadow: 0 4px 16px rgba(0,0,0,0.2); }

/* === Footer === */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12) var(--space-8);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-12);
  margin-bottom: var(--space-10);
}
.footer__brand-name { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-3); }
.footer__brand-desc { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.65; max-width: 28ch; }
.footer__col-title { font-size: var(--text-sm); font-weight: 700; color: var(--color-text); text-transform: uppercase; letter-spacing: 0.07em; margin-bottom: var(--space-4); }
.footer__links { display: flex; flex-direction: column; gap: var(--space-3); }
.footer__links a { font-size: var(--text-sm); color: var(--color-text-muted); transition: color var(--transition-interactive); }
.footer__links a:hover { color: var(--color-primary); }
.footer__bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: var(--space-8); border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs); color: var(--color-text-faint);
  flex-wrap: wrap; gap: var(--space-4);
}
.footer__disclaimer {
  font-size: var(--text-xs); color: var(--color-text-faint);
  max-width: 60ch; line-height: 1.6; margin-top: var(--space-6);
  padding: var(--space-4); background: var(--color-surface-2); border-radius: var(--radius-md);
}

@media (max-width: 768px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer__grid { grid-template-columns: 1fr; }
}

/* === Utility === */
.text-center { text-align: center; }
.text-gold { color: var(--color-gold); }
.text-primary { color: var(--color-primary); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-0 { margin-bottom: 0; }
.divider { border: none; border-top: 1px solid var(--color-divider); margin-block: var(--space-8); }

/* Scroll animations */
.fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.55s cubic-bezier(0.16,1,0.3,1), transform 0.55s cubic-bezier(0.16,1,0.3,1); }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up:nth-child(1) { transition-delay: 0ms; }
.fade-up:nth-child(2) { transition-delay: 80ms; }
.fade-up:nth-child(3) { transition-delay: 160ms; }
.fade-up:nth-child(4) { transition-delay: 240ms; }

/* ── Reviews screenshot grid ── */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-8);
}
@media (max-width: 900px) {
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 540px) {
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}
.review-screenshot img {
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.review-screenshot img:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}