/* NilaPlayer Marketing — Light theme */

@font-face {
  font-family: 'IRANYekanWeb';
  src: url('../assets/fonts/IRANYekanWebRegular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IRANYekanWeb';
  src: url('../assets/fonts/IRANYekanWebMedium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IRANYekanWeb';
  src: url('../assets/fonts/IRANYekanWebBold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IRANYekanWeb';
  src: url('../assets/fonts/IRANYekanWebExtraBold.ttf') format('truetype');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f8faff;
  --bg-soft: #ffffff;
  --bg-muted: #eef2ff;
  --text: #0f172a;
  --text-soft: #475569;
  --text-muted: #64748b;
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-soft: #e0e7ff;
  --accent: #14b8a6;
  --accent-soft: #ccfbf1;
  --coral: #f97316;
  --coral-soft: #ffedd5;
  --violet: #8b5cf6;
  --violet-soft: #ede9fe;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(99, 102, 241, 0.08);
  --shadow-lg: 0 20px 50px rgba(99, 102, 241, 0.12);
  --radius: 16px;
  --radius-lg: 24px;
  --max: 1120px;
  --font: 'IRANYekanWeb', Tahoma, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
}

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

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  padding: 0.5rem 0.85rem;
  border-radius: 10px;
  color: var(--text-soft);
  font-weight: 500;
  font-size: 0.92rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-dark);
  background: var(--primary-soft);
}

.nav-cta {
  display: flex;
  gap: 0.5rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.45rem 0.65rem;
  font-size: 1.2rem;
  cursor: pointer;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.75rem 1.35rem;
  border-radius: 12px;
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.92rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
  text-decoration: none;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover { color: #fff; box-shadow: 0 8px 28px rgba(99, 102, 241, 0.45); }

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

.btn-secondary:hover { background: var(--bg-muted); color: var(--text); }

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #0d9488);
  color: #fff;
  box-shadow: 0 6px 20px rgba(20, 184, 166, 0.3);
}

.btn-accent:hover { color: #fff; }

.btn-lg { padding: 0.95rem 1.75rem; font-size: 1rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 4.5rem 0 5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(99, 102, 241, 0.12), transparent),
    radial-gradient(ellipse 60% 50% at 90% 10%, rgba(20, 184, 166, 0.1), transparent),
    radial-gradient(ellipse 50% 40% at 50% 100%, rgba(249, 115, 22, 0.08), transparent);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--primary), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-soft);
  margin: 0 0 1.75rem;
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.stat-item strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary-dark);
}

.stat-item span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-visual {
  position: relative;
}

.mock-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.mock-topbar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1rem;
  background: var(--bg-muted);
  border-bottom: 1px solid var(--border);
}

.mock-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #cbd5e1;
}

.mock-dot:nth-child(1) { background: #fca5a5; }
.mock-dot:nth-child(2) { background: #fde047; }
.mock-dot:nth-child(3) { background: #86efac; }

.mock-body {
  padding: 1.25rem;
}

.mock-video {
  aspect-ratio: 16/9;
  border-radius: 12px;
  background: linear-gradient(145deg, #1e293b, #334155);
  position: relative;
  display: grid;
  place-items: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
}

.mock-wm {
  position: absolute;
  bottom: 12%;
  left: 18%;
  padding: 0.35rem 0.65rem;
  background: rgba(0,0,0,0.35);
  border-radius: 6px;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.75);
}

.mock-badge {
  position: absolute;
  top: -12px;
  right: -12px;
  background: var(--accent-soft);
  color: #0f766e;
  padding: 0.5rem 0.85rem;
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid #99f6e4;
  box-shadow: var(--shadow);
}

/* ---------- Sections ---------- */
section { padding: 4.5rem 0; }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin: 0 0 0.75rem;
}

.section-head p {
  color: var(--text-soft);
  margin: 0;
  font-size: 1.02rem;
}

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

.feature-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.feature-icon.indigo { background: var(--primary-soft); }
.feature-icon.teal { background: var(--accent-soft); }
.feature-icon.coral { background: var(--coral-soft); }
.feature-icon.violet { background: var(--violet-soft); }

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-soft);
}

/* ---------- Split / Security ---------- */
.split-section {
  background: linear-gradient(180deg, var(--bg-soft) 0%, var(--bg-muted) 100%);
  border-block: 1px solid var(--border);
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.check-list li {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  margin-bottom: 0.85rem;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.check-list li::before {
  content: '✓';
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: #0d9488;
  font-size: 0.75rem;
  font-weight: 800;
  display: grid;
  place-items: center;
  margin-top: 0.15rem;
}

.security-stack {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.stack-item {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.15rem;
  display: flex;
  gap: 0.85rem;
  align-items: center;
  box-shadow: var(--shadow);
}

.stack-num {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.stack-item strong { display: block; font-size: 0.95rem; }
.stack-item span { font-size: 0.85rem; color: var(--text-muted); }

/* ---------- Audience cards ---------- */
.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.audience-card {
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--border);
}

.audience-card.instructor {
  background: linear-gradient(135deg, #faf5ff 0%, #ede9fe 100%);
  border-color: #ddd6fe;
}

.audience-card.student {
  background: linear-gradient(135deg, #f0fdfa 0%, #ccfbf1 100%);
  border-color: #99f6e4;
}

.audience-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
}

.audience-card ul {
  margin: 0 0 1.25rem;
  padding-right: 1.25rem;
  color: var(--text-soft);
  font-size: 0.92rem;
}

/* ---------- Publisher form ---------- */
.publisher-section {
  background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 50%, #fef3c7 100%);
  border-block: 1px solid #fed7aa;
}

.publisher-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.form-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

.form-group { margin-bottom: 1.15rem; }

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-family: var(--font);
  font-size: 0.95rem;
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-group textarea { min-height: 100px; resize: vertical; }

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.form-success {
  display: none;
  padding: 1rem;
  background: var(--accent-soft);
  border: 1px solid #99f6e4;
  border-radius: 12px;
  color: #0f766e;
  font-weight: 600;
  margin-top: 1rem;
}

.form-success.show { display: block; }

/* ---------- Download page ---------- */
.page-hero {
  padding: 3.5rem 0 2.5rem;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-muted) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 800;
  margin: 0 0 0.75rem;
}

.page-hero p {
  color: var(--text-soft);
  max-width: 560px;
  margin: 0 auto;
}

.download-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.download-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: box-shadow 0.2s;
}

.download-card:hover { box-shadow: var(--shadow-lg); }

.download-card .platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 1.75rem;
}

.download-card.windows .platform-icon {
  background: linear-gradient(135deg, #dbeafe, #bfdbfe);
}

.download-card.web .platform-icon {
  background: linear-gradient(135deg, var(--accent-soft), #99f6e4);
}

.download-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.download-card .version {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.steps {
  counter-reset: step;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.step:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.step-num {
  counter-increment: step;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff;
  font-weight: 800;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.step-num::before { content: counter(step); }

.step h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.step p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.step code {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.35rem 0.65rem;
  background: var(--bg-muted);
  border-radius: 8px;
  font-size: 0.85rem;
  direction: ltr;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.tab-btn {
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  color: var(--text-soft);
  transition: all 0.2s;
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-dark);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.faq-item {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-q {
  width: 100%;
  text-align: right;
  padding: 1rem 1.25rem;
  background: none;
  border: none;
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}

.faq-a {
  padding: 0 1.25rem 1rem;
  color: var(--text-soft);
  font-size: 0.92rem;
  display: none;
}

.faq-item.open .faq-a { display: block; }
.faq-item.open .faq-q span { transform: rotate(180deg); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--text);
  color: #cbd5e1;
  padding: 3rem 0 1.5rem;
  margin-top: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-grid h4 {
  color: #fff;
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li { margin-bottom: 0.5rem; }

.footer-grid a {
  color: #94a3b8;
  font-size: 0.9rem;
}

.footer-grid a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: #64748b;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid,
  .split-grid,
  .publisher-grid,
  .features-grid,
  .audience-grid,
  .download-cards,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }

  .nav-links.open { display: flex; }

  .nav-toggle { display: block; }

  .site-header .container { position: relative; }
}

@media (max-width: 600px) {
  .hero { padding: 3rem 0; }
  section { padding: 3rem 0; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
}