/* ==========================================================================
   PrusaSlicer 官网设计系统
   配色基于 Logo：Prusa Orange #ED6B21 + Charcoal #2A2A2A
   风格：扁平 / 现代 / 专业 / 无 emoji
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand Colors */
  --color-primary: #ED6B21;
  --color-primary-dark: #C95A15;
  --color-primary-light: #FF8A3D;
  --color-primary-soft: #FFF1E8;

  /* Neutral Colors */
  --color-charcoal: #2A2A2A;
  --color-text: #1F1F1F;
  --color-text-secondary: #5F6368;
  --color-text-muted: #8A8F94;
  --color-border: #E5E5E7;
  --color-border-soft: #F0F0F2;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F7F9;
  --color-bg-dark: #1A1A1A;

  /* Status Colors */
  --color-success: #2E7D32;
  --color-info: #1A73E8;
  --color-warning: #F9AB00;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
               Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, Consolas, "Liberation Mono",
               "Courier New", monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
  --shadow-orange: 0 8px 24px rgba(237, 107, 33, 0.25);

  /* Layout */
  --container-max: 1200px;
  --header-height: 64px;

  /* Transition */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: var(--color-primary-dark);
}

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

ul, ol {
  list-style: none;
}

/* ---------- Container ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-narrow {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-charcoal);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: clamp(20px, 2.4vw, 24px);
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: 18px;
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.text-center { text-align: center; }
.text-white { color: #fff; }
.text-white p { color: rgba(255,255,255,0.78); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.2s var(--ease);
  white-space: nowrap;
  border: 2px solid transparent;
  line-height: 1.2;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-orange);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(237, 107, 33, 0.35);
}

.btn-secondary {
  background: var(--color-charcoal);
  color: #fff;
}

.btn-secondary:hover {
  background: #000;
  color: #fff;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-charcoal);
  border-color: var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-color: rgba(255,255,255,0.25);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.18);
  color: #fff;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 17px;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ---------- Header / Navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border-soft);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 18px;
  color: var(--color-charcoal);
  letter-spacing: -0.01em;
}

.brand img {
  width: 32px;
  height: 32px;
}

.brand:hover {
  color: var(--color-charcoal);
}

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

.main-nav a {
  color: var(--color-text-secondary);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-charcoal);
}

.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
  color: var(--color-charcoal);
}

@media (max-width: 900px) {
  .header-cta .btn:not(.btn-primary) { display: none; }
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    gap: var(--space-md);
    transform: translateY(-150%);
    transition: transform 0.3s var(--ease);
    box-shadow: var(--shadow-lg);
  }
  .main-nav.open {
    transform: translateY(0);
  }
  .main-nav a {
    width: 100%;
    padding: 12px 0;
    font-size: 16px;
  }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(237,107,33,0.12), transparent 60%),
    radial-gradient(800px 500px at 0% 100%, rgba(237,107,33,0.06), transparent 60%),
    var(--color-bg);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.hero-title {
  margin-bottom: var(--space-lg);
}

.hero-title .accent {
  color: var(--color-primary);
}

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

.hero-stats {
  display: flex;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.stat .num {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-charcoal);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat .num span {
  color: var(--color-primary);
}

.stat .label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.hero-visual {
  position: relative;
}

.hero-card {
  background: linear-gradient(160deg, #2A2A2A 0%, #1A1A1A 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 70%;
  height: 100%;
  background: radial-gradient(circle, rgba(237,107,33,0.25), transparent 60%);
  pointer-events: none;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.hero-card-header .dots {
  display: flex;
  gap: 6px;
}

.hero-card-header .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
}

.hero-card-header .dot:nth-child(1) { background: #FF5F57; }
.hero-card-header .dot:nth-child(2) { background: #FEBC2E; }
.hero-card-header .dot:nth-child(3) { background: #28C840; }

.hero-card-header .filename {
  color: rgba(255,255,255,0.6);
  font-size: 13px;
  font-family: var(--font-mono);
  margin-left: var(--space-sm);
}

.gcode-preview {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: #c8c8c8;
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  max-height: 340px;
  overflow: hidden;
  position: relative;
}

.gcode-preview .line {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.gcode-preview .kw { color: var(--color-primary-light); }
.gcode-preview .val { color: #6BCB77; }
.gcode-preview .cm { color: #6E7681; }

.hero-card-footer {
  margin-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: rgba(255,255,255,0.5);
  font-size: 13px;
}

.hero-card-footer .progress {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-card-footer .progress-bar {
  width: 80px;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  overflow: hidden;
}

.hero-card-footer .progress-bar > span {
  display: block;
  height: 100%;
  width: 76%;
  background: var(--color-primary);
  border-radius: 2px;
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .hero-stats { gap: var(--space-xl); }
}

/* ---------- Section ---------- */
.section {
  padding: var(--space-3xl) 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-dark {
  background: var(--color-bg-dark);
  color: #fff;
}

.section-dark h2,
.section-dark h3 {
  color: #fff;
}

.section-dark p {
  color: rgba(255,255,255,0.7);
}

.section-head {
  max-width: 720px;
  margin: 0 auto var(--space-2xl);
  text-align: center;
}

.section-head p {
  font-size: 17px;
}

/* ---------- Feature Grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all 0.25s var(--ease);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

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

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 15px;
  line-height: 1.65;
}

@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .feature-grid { grid-template-columns: 1fr; }
}

/* ---------- Usage Scenarios ---------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.scenario-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-charcoal);
  color: #fff;
  min-height: 280px;
  display: flex;
  align-items: flex-end;
  padding: var(--space-xl);
  isolation: isolate;
}

.scenario-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 30%, rgba(0,0,0,0.85) 100%);
  z-index: -1;
}

.scenario-card .scene {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-size: cover;
  background-position: center;
}

.scenario-card .scene-pattern {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 20% 30%, rgba(237,107,33,0.35), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255,138,61,0.25), transparent 50%),
    linear-gradient(135deg, #2A2A2A, #1A1A1A);
}

.scenario-card .scene-pattern.blue {
  background:
    radial-gradient(circle at 70% 20%, rgba(26,115,232,0.3), transparent 50%),
    linear-gradient(135deg, #1F2937, #111827);
}

.scenario-card .scene-pattern.green {
  background:
    radial-gradient(circle at 30% 70%, rgba(46,125,50,0.3), transparent 50%),
    linear-gradient(135deg, #1F2A26, #0F1411);
}

.scenario-card .scene-pattern.purple {
  background:
    radial-gradient(circle at 50% 30%, rgba(149,82,255,0.3), transparent 50%),
    linear-gradient(135deg, #2A1F3D, #1A1226);
}

.scenario-card h3 {
  color: #fff;
  font-size: 22px;
  margin-bottom: var(--space-sm);
}

.scenario-card p {
  color: rgba(255,255,255,0.85);
  font-size: 15px;
  margin: 0;
}

.scenario-tag {
  position: absolute;
  top: var(--space-lg);
  left: var(--space-lg);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  background: rgba(237,107,33,0.95);
  color: #fff;
  border-radius: var(--radius-full);
}

@media (max-width: 760px) {
  .scenario-grid { grid-template-columns: 1fr; }
}

/* ---------- Testimonials ---------- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.testimonial {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
}

.testimonial .quote-mark {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  font-size: 64px;
  font-family: Georgia, serif;
  color: var(--color-primary-soft);
  line-height: 1;
  user-select: none;
}

.testimonial-rating {
  display: flex;
  gap: 2px;
  color: var(--color-primary);
}

.testimonial-rating svg {
  width: 16px;
  height: 16px;
}

.testimonial-body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  flex: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-soft);
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.testimonial-name {
  font-weight: 600;
  color: var(--color-charcoal);
  font-size: 15px;
}

.testimonial-role {
  font-size: 13px;
  color: var(--color-text-muted);
}

@media (max-width: 900px) {
  .testimonial-grid { grid-template-columns: 1fr; }
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #D85A12 100%);
  color: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.15), transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1), transparent 40%);
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  margin-bottom: var(--space-md);
  position: relative;
}

.cta-banner p {
  color: rgba(255,255,255,0.9);
  font-size: 17px;
  margin-bottom: var(--space-xl);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cta-banner .hero-actions {
  justify-content: center;
  margin-bottom: 0;
  position: relative;
}

/* ---------- Page Header (interior pages) ---------- */
.page-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  background:
    radial-gradient(1000px 500px at 80% -50%, rgba(237,107,33,0.1), transparent 60%),
    var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border-soft);
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-header p {
  font-size: 17px;
  max-width: 640px;
}

.breadcrumb {
  display: flex;
  gap: var(--space-sm);
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb .sep {
  color: var(--color-text-muted);
}

/* ---------- Download Page ---------- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.platform-card {
  background: #fff;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all 0.2s var(--ease);
}

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

.platform-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-md);
  color: var(--color-charcoal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 100%;
  height: 100%;
}

.platform-card h3 {
  margin-bottom: var(--space-xs);
}

.platform-version {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.platform-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-soft);
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

@media (max-width: 900px) {
  .platform-grid { grid-template-columns: 1fr; }
}

/* ---------- Requirements Table ---------- */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.spec-table {
  width: 100%;
  min-width: 640px;
  border-collapse: separate;
  border-spacing: 0;
  background: #fff;
}

.spec-table th,
.spec-table td {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border-soft);
  vertical-align: top;
}

.spec-table th {
  background: var(--color-bg-alt);
  font-weight: 700;
  color: var(--color-charcoal);
  font-size: 14px;
}

.spec-table tr:last-child th,
.spec-table tr:last-child td {
  border-bottom: none;
}

.spec-table td .req-key {
  font-weight: 600;
  color: var(--color-charcoal);
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
}

.spec-table td .req-val {
  font-size: 14px;
  color: var(--color-text-secondary);
}

@media (max-width: 760px) {
  .spec-table th,
  .spec-table td {
    padding: var(--space-sm) var(--space-md);
    font-size: 13px;
  }
  .spec-table td .req-key { font-size: 13px; }
  .spec-table td .req-val { font-size: 13px; }
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-left: var(--space-2xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

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

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: -52px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-date {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
  text-transform: uppercase;
}

.timeline-item h4 {
  font-size: 17px;
  margin-bottom: var(--space-sm);
  color: var(--color-charcoal);
}

/* ---------- Tutorial Card ---------- */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.tutorial-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.25s var(--ease);
  display: flex;
  flex-direction: column;
}

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

.tutorial-thumb {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--color-charcoal), #1A1A1A);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tutorial-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(237,107,33,0.4), transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(255,138,61,0.2), transparent 50%);
}

.tutorial-thumb .play-icon {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.tutorial-thumb .play-icon svg {
  width: 22px;
  height: 22px;
  margin-left: 3px;
}

.tutorial-thumb .duration {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

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

.tutorial-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
  align-self: flex-start;
}

.tutorial-card h4 {
  font-size: 17px;
  margin-bottom: var(--space-sm);
  color: var(--color-charcoal);
}

.tutorial-card p {
  font-size: 14px;
  margin-bottom: var(--space-md);
  flex: 1;
}

.tutorial-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-soft);
}

@media (max-width: 900px) {
  .tutorial-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .tutorial-grid { grid-template-columns: 1fr; }
}

/* ---------- Resource list ---------- */
.resource-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.resource-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s var(--ease);
}

.resource-item:hover {
  border-color: var(--color-primary);
  transform: translateX(4px);
}

.resource-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.resource-icon svg {
  width: 20px;
  height: 20px;
}

.resource-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}

.resource-item p {
  font-size: 14px;
  margin: 0;
}

@media (max-width: 760px) {
  .resource-list { grid-template-columns: 1fr; }
}

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: var(--color-border);
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-num {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  background: #fff;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
}

.step h4 {
  font-size: 16px;
  margin-bottom: var(--space-xs);
}

.step p {
  font-size: 14px;
  margin: 0;
}

@media (max-width: 900px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }
  .steps::before { display: none; }
}

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

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  font-weight: 600;
  color: var(--color-charcoal);
  font-size: 16px;
  text-align: left;
  background: #fff;
  transition: background 0.2s var(--ease);
}

.faq-q:hover {
  background: var(--color-bg-alt);
}

.faq-q .icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.2s var(--ease);
}

.faq-item.open .faq-q .icon {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--ease);
}

.faq-a-inner {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- Community / Channels ---------- */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.channel-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all 0.2s var(--ease);
}

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

.channel-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-charcoal);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.channel-icon svg {
  width: 28px;
  height: 28px;
}

.channel-card h4 {
  font-size: 17px;
  margin-bottom: var(--space-xs);
}

.channel-card .meta {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.channel-card p {
  font-size: 14px;
  margin-bottom: var(--space-md);
}

@media (max-width: 900px) {
  .channel-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .channel-grid { grid-template-columns: 1fr; }
}

/* ---------- Stats Strip ---------- */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stats-strip .stat {
  padding: var(--space-lg);
}

.stats-strip .num {
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stats-strip .label {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

@media (max-width: 760px) {
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Two Column ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.two-col.reverse .col-text { order: 2; }

@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; gap: var(--space-xl); }
  .two-col.reverse .col-text { order: -1; }
}

.col-visual-card {
  background: linear-gradient(160deg, #2A2A2A 0%, #1A1A1A 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  color: #fff;
  position: relative;
  overflow: hidden;
  min-height: 320px;
}

.col-visual-card::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle, rgba(237,107,33,0.3), transparent 60%);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}

.footer-brand img {
  width: 28px;
  height: 28px;
}

.footer-top p {
  color: rgba(255,255,255,0.55);
  font-size: 14px;
  max-width: 280px;
  margin-bottom: var(--space-md);
}

.footer-col h5 {
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-col a {
  color: rgba(255,255,255,0.6);
  font-size: 14px;
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin: 0;
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s var(--ease);
}

.footer-social a:hover {
  background: var(--color-primary);
  color: #fff;
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  .footer-top .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 540px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* ---------- Download Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s var(--ease), visibility 0.25s var(--ease);
  padding: var(--space-lg);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}
button { outline: none }
.modal {
  background: #fff;
  border-radius: var(--radius-xl);
  max-width: 720px;
  width: 100%;
  max-height: 92vh;
  overflow: auto;
  transform: translateY(20px) scale(0.98);
  transition: transform 0.3s var(--ease);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xl) var(--space-xl) var(--space-md);
  border-bottom: 1px solid var(--color-border-soft);
}

.modal-header h3 {
  margin: 0;
  font-size: 22px;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s var(--ease);
}

.modal-close:hover {
  background: var(--color-border);
  color: var(--color-charcoal);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  padding: var(--space-xl);
}

.platform-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding: 4px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}

.platform-tab {
  flex: 1;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: all 0.2s var(--ease);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.platform-tab svg {
  width: 16px;
  height: 16px;
}

.platform-tab.active {
  background: #fff;
  color: var(--color-charcoal);
  box-shadow: var(--shadow-sm);
}

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

.qr-card {
  text-align: center;
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s var(--ease);
}

.qr-card:hover {
  border-color: var(--color-primary);
}

.qr-card .qr-img {
  width: 180px;
  height: 180px;
  margin: 0 auto var(--space-md);
  background: #fff;
  padding: 8px;
  border-radius: var(--radius-sm);
  display: block;
}

.qr-card .qr-img img,
.qr-card .qr-img svg {
  width: 100%;
  height: 100%;
}

.qr-card h4 {
  font-size: 15px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.qr-card h4 svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
}

.qr-card .qr-desc {
  font-size: 12px;
  color: var(--color-text-muted);
}

.modal-footer-info {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-soft);
  display: flex;
  gap: var(--space-md);
  font-size: 13px;
  color: var(--color-text-muted);
}

.modal-footer-info svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 1px;
}

@media (max-width: 540px) {
  .qr-section { grid-template-columns: 1fr; }
  .platform-tabs { flex-direction: column; }
}

/* ---------- Misc Utilities ---------- */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xl) 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-radius: var(--radius-full);
}

.tag-neutral {
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
}

.badge-version {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--color-charcoal);
  color: #fff;
  border-radius: var(--radius-full);
}

.list-check {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.list-check li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--color-text-secondary);
}

.list-check li svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.list-check li strong {
  color: var(--color-charcoal);
  font-weight: 600;
}

/* Code block */
.code-block {
  background: var(--color-bg-dark);
  color: #e0e0e0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.code-block .kw { color: #FF8A3D; }
.code-block .val { color: #6BCB77; }
.code-block .cm { color: #6E7681; }

/* Skip link for a11y */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 1000;
}

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

/* Focus visibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}