:root {
  color-scheme: light;
  --bg: #f7f4ef;
  --bg-deep: #0f1c24;
  --surface: #ffffff;
  --ink: #0b1116;
  --muted: #5b6872;
  --primary: #0f6a5f;
  --primary-strong: #0b4f47;
  --accent: #f39c38;
  --accent-strong: #e6791f;
  --ring: rgba(15, 106, 95, 0.18);
  --shadow: 0 24px 60px rgba(13, 25, 33, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --content-width: 1160px;
  --transition: 200ms ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Vazirmatn RD UI FD";
  background: radial-gradient(
    circle at 30% -10%,
    #fff6e6 0%,
    #f7f4ef 45%,
    #edf0f2 100%
  );
  color: var(--ink);
  line-height: 1.9;
  min-height: 100vh;
}

body.menu-open {
  overflow: hidden;
}

button,
input,
select,
textarea {
  font-family: inherit;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition:
    color var(--transition),
    transform var(--transition);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

.wrap {
  width: min(100% - 40px, var(--content-width));
  margin: 0 auto;
}

.hidden {
  display: none;
}

.skip-link {
  position: absolute;
  top: -100px;
  right: 20px;
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: 999px;
  z-index: 999;
}

.skip-link:focus {
  top: 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(247, 244, 239, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(15, 28, 36, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(140deg, var(--primary), #22a296);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.2rem;
  box-shadow: 0 12px 20px rgba(15, 106, 95, 0.25);
}

.brand-title {
  display: flex;
  flex-direction: column;
  font-weight: 700;
  font-size: 1rem;
}

.brand-title span {
  font-family: "Vazirmatn RD UI FD";
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-weight: 500;
  color: var(--muted);
}

.main-nav a {
  position: relative;
  transition: color var(--transition);
}

.main-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

.main-nav a:hover,
.main-nav a:focus {
  color: var(--primary-strong);
  transform: translateY(-1px);
}

.main-nav a:hover::after,
.main-nav a:focus::after,
.main-nav a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 22px;
  font-weight: 600;
  border: 1px solid transparent;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    background var(--transition),
    color var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 14px 28px rgba(15, 106, 95, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--primary-strong);
}

.btn-ghost {
  border-color: rgba(15, 106, 95, 0.25);
  color: var(--primary-strong);
  background: #fff;
}

.btn-ghost:hover {
  box-shadow: inset 0 0 0 999px rgba(15, 106, 95, 0.08);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero {
  padding: 80px 0 60px;
  position: relative;
  overflow: visible;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
  gap: 40px;
}

.hero h1 {
  font-size: clamp(2.4rem, 3.6vw, 3.6rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 18px;
}

.hero p {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 26px;
}

.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 26px;
  box-shadow: var(--shadow);
  position: relative;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.hero-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 26px 55px rgba(13, 25, 33, 0.18);
}

.hero-card img {
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(15, 28, 36, 0.18);
}

.hero-badge {
  position: absolute;
  top: 22px;
  right: 22px;
  background: rgba(15, 106, 95, 0.95);
  color: #fff;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  box-shadow: 0 10px 20px rgba(15, 106, 95, 0.3);
  transition: transform var(--transition);
}

.hero-bg {
  display: none;
}

.section {
  padding: 70px 0;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 18px;
}

.section-subtitle {
  color: var(--muted);
  margin-bottom: 32px;
  max-width: 640px;
}

/* Video player section specific styles */
.video-player ~ .section:first-of-type > .grid-3 {
  margin-top: 0;
}

.video-player ~ .section:last-of-type > div {
  border-top: none;
  padding-top: 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: 0 16px 30px rgba(13, 25, 33, 0.08);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 45px rgba(13, 25, 33, 0.14);
}

.stat-card strong {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary-strong);
}

.stat-card span {
  color: var(--muted);
  display: block;
  margin-top: 6px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(15, 28, 36, 0.06);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 28px 60px rgba(13, 25, 33, 0.18);
}

.feature-card h3 {
  margin-bottom: 4px;
  font-size: 1.16rem;
  font-weight: 700;
}

.feature-card p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 8px;
  flex-grow: 1;
}

.feature-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: rgba(15, 106, 95, 0.12);
  margin-bottom: 16px;
}

.grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.grade-card {
  padding: 24px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #ffffff, #f8f8f8);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.grade-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 50px rgba(13, 25, 33, 0.16);
}

.grade-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 80% 20%,
    rgba(15, 106, 95, 0.15),
    transparent 60%
  );
  opacity: 0.8;
}

.grade-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.grade-card p,
.grade-card a {
  position: relative;
  z-index: 1;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.media-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.media-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 50px rgba(13, 25, 33, 0.16);
}

.media-card span {
  font-size: 0.85rem;
  color: var(--muted);
}

.media-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 106, 95, 0.12);
  color: var(--primary-strong);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.timeline-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 45px rgba(13, 25, 33, 0.14);
}

.timeline-time {
  font-weight: 700;
  color: var(--primary-strong);
}

.testimonial {
  padding: 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, #ffffff, #f8f5ef);
  box-shadow: var(--shadow);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.testimonial:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 45px rgba(13, 25, 33, 0.14);
}

.faq {
  display: grid;
  gap: 12px;
}

.faq details {
  background: var(--surface);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(15, 28, 36, 0.06);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.faq details:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(13, 25, 33, 0.12);
}

.faq summary {
  font-weight: 600;
  cursor: pointer;
}

.cta {
  background: linear-gradient(135deg, var(--primary), #0d8677);
  color: #fff;
  border-radius: var(--radius-xl);
  padding: 40px;
  display: grid;
  gap: 18px;
  box-shadow: var(--shadow);
}

.cta p {
  color: rgba(255, 255, 255, 0.85);
}

.site-footer {
  font-family: "Vazirmatn RD UI FD";
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 30px;
  margin-top: 40px;
}

.site-footer .footer-grid div:nth-child(3) a {
  direction: ltr;
  text-align: right;
  display: block; /* برای اینکه هر کدام در خط جداگانه قرار گیرند */
  unicode-bidi: embed; /* جلوگیری از تأثیر direction کلی روی اعداد */
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 26px;
}

.footer-grid h4 {
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
}

.footer-grid a {
  color: rgba(255, 255, 255, 0.7);
  display: block;
  margin-bottom: 8px;
  transition:
    color var(--transition),
    transform var(--transition);
}

.footer-grid a:hover {
  color: #fff;
  transform: translateX(-4px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  margin-top: 30px;
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(15, 28, 36, 0.2);
  border-radius: 12px;
  padding: 8px 10px;
  font-size: 1.2rem;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.mobile-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(13, 25, 33, 0.12);
}

.mobile-panel-close {
  position: absolute;
  top: 16px;
  left: 16px; /* چون پنل از راست می‌آید، دکمه بستن را چپ قرار می‌دهیم */
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 50%;
  font-size: 1.5rem;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background-color var(--transition),
    transform var(--transition);
  z-index: 215; /* بالاتر از nav */
}

.mobile-panel-close:hover {
  background: rgba(0, 0, 0, 0.1);
  transform: scale(1.1);
}

.mobile-panel {
  position: fixed;
  inset: 0;
  background: rgba(10, 18, 24, 0.3);
  backdrop-filter: blur(4px); /* افکت مات */
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 210;
}

.mobile-panel.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-panel nav {
  position: absolute;
  top: 0;
  right: 0;
  width: min(320px, 85vw);
  height: 100%;
  background: var(--surface);
  padding: 60px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transform: translateX(100%);
  transition: transform var(--transition);
  box-shadow: -5px 0 25px rgba(0, 0, 0, 0.15); /* سایه برای عمق بیشتر */
}

.mobile-panel.open nav {
  transform: translateX(0);
}

.mobile-panel a {
  font-weight: 500; /* کمی نرم‌تر */
  color: var(--ink);
  padding: 12px 16px;
  border-radius: 12px; /* گوشه‌های گرد */
  transition:
    background-color var(--transition),
    color var(--transition),
    transform var(--transition);
  text-decoration: none;
  display: block; /* برای padding */
}

.mobile-panel a:hover {
  background: rgba(15, 106, 95, 0.08); /* هایلایت ملایم */
  color: var(--primary-strong);
  transform: translateX(-4px); /* حرکت به چپ (جهت RTL) */
}

/* تغییر: استایل لینک ثبت مشاوره (متفاوت) */
.mobile-panel .consultation-btn {
  background: var(--primary); /* رنگ اصلی */
  color: white;
  text-align: center;
  margin-top: 8px;
  border: none;
  font-weight: 600;
}

.mobile-panel .consultation-btn:hover {
  background: var(--primary-strong);
  color: white;
  transform: translateY(-8px);
  box-shadow: 0 8px 16px rgba(15, 106, 95, 0.3);
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block; /* نمایش دکمه در موبایل */
  }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 500ms ease,
    transform 500ms ease;
}

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

.library-filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.library-filters label {
  font-size: 0.85rem;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}

.library-filters select,
.library-filters input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(15, 28, 36, 0.15);
  font-family: inherit;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}

/* Bookshelf Grade Tabs */
.grade-tabs-wrapper {
  margin: 40px 0 60px;
}

.grade-tabs {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 2px solid rgba(15, 28, 36, 0.1);
  padding-bottom: 20px;
}

.grade-tab {
  background: none;
  border: none;
  padding: 12px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  position: relative;
  transition: color var(--transition);
  border-radius: 12px 12px 0 0;
}

.grade-tab:hover {
  color: var(--primary-strong);
  background: rgba(15, 106, 95, 0.06);
}

.grade-tab.active {
  color: var(--primary);
  background: rgba(15, 106, 95, 0.1);
  border-bottom: 3px solid var(--primary);
}

/* Bookshelf Container */
.bookshelf-container {
  perspective: 1000px;
  padding: 20px 0;
}

.bookshelf-section {
  margin-bottom: 60px;
  opacity: 0;
  animation: fadeInShelf 400ms ease forwards;
}

@keyframes fadeInShelf {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.bookshelf-section h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(15, 28, 36, 0.08);
  color: var(--ink);
}

.shelf {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 28px 24px;
  background: linear-gradient(
    180deg,
    rgba(15, 106, 95, 0.04) 0%,
    rgba(15, 106, 95, 0.02) 100%
  );
  border-radius: 12px;
  border-top: 3px solid rgba(15, 106, 95, 0.15);
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(3deg);
  box-shadow: 0 10px 30px rgba(13, 25, 33, 0.08);
}

.shelf::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 1px;
  background: rgba(15, 106, 95, 0.2);
  transform: translateZ(1px);
}

/* Individual Book */
.book {
  position: relative;
  width: 90px;
  height: 140px;
  border-radius: 6px;
  padding: 12px 8px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  text-align: center;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition:
    transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 300ms ease,
    filter 300ms ease;
  box-shadow: 0 8px 16px rgba(13, 25, 33, 0.15);
  overflow: hidden;
  word-break: break-word;
  padding: 16px 8px;
  box-sizing: border-box;
}

.book::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 6px;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1),
    rgba(0, 0, 0, 0.1)
  );
  pointer-events: none;
}

/* Book Colors by Type */
.book.video {
  background: linear-gradient(135deg, var(--primary), #0d8677);
}

.book.notes {
  background: linear-gradient(135deg, var(--accent), #d66d1a);
}

/* Book Hover State */
.book:hover {
  transform: translateY(-24px) rotateZ(4deg) scale(1.08);
  box-shadow: 0 20px 40px rgba(13, 25, 33, 0.25);
  filter: brightness(1.1);
}

.book:active {
  transform: translateY(-20px) rotateZ(4deg) scale(1.05);
}

/* Book Preview Tooltip */
.book-preview {
  position: absolute;
  bottom: 100%;
  right: 50%;
  transform: translateX(50%) translateY(-12px);
  background: var(--ink);
  color: #fff;
  padding: 16px 20px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 500;
  width: max-content;
  max-width: 280px;
  z-index: 100;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 200ms ease,
    visibility 200ms ease,
    transform 200ms ease;
  box-shadow: 0 12px 32px rgba(13, 25, 33, 0.3);
  white-space: normal;
  text-align: right;
  direction: rtl;
}

.book-preview::after {
  content: "";
  position: absolute;
  top: 100%;
  right: 20px;
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid var(--ink);
}

.book:hover .book-preview {
  opacity: 1;
  visibility: visible;
  transform: translateX(50%) translateY(-16px);
}

.book-preview-title {
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.book-preview-meta {
  font-size: 0.8rem;
  opacity: 0.8;
  margin-bottom: 8px;
}

.book-preview-meta span {
  display: block;
  margin-bottom: 2px;
}

/* Empty State */
.library-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}

.library-empty p {
  font-size: 1.1rem;
}

.library-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.library-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 28px 60px rgba(13, 25, 33, 0.16);
}

.library-card .actions .btn {
  flex: 1 1 160px;
}

.library-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
}

.form-grid {
  display: grid;
  gap: 16px;
}

.form-grid input,
.form-grid textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(15, 28, 36, 0.12);
  font-family: inherit;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}

.form-grid input:focus,
.form-grid textarea:focus,
.library-filters input:focus,
.library-filters select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--ring);
}

.form-grid textarea {
  min-height: 140px;
  resize: vertical;
}

.video-player {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.video-frame {
  position: relative;
  padding-top: 56.25%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(13, 25, 33, 0.18);
  background: #0b1116;
  transition: box-shadow var(--transition);
}

.video-frame:hover {
  box-shadow: 0 28px 80px rgba(13, 25, 33, 0.24);
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-meta {
  display: grid;
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 2px solid rgba(15, 28, 36, 0.08);
}

.video-meta .tag {
  width: fit-content;
  background: rgba(15, 106, 95, 0.15);
  color: var(--primary);
}

.video-meta h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.3;
  color: var(--ink);
  margin: 0;
}

.video-meta p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0;
}

@media (max-width: 980px) {
  .main-nav,
  .header-actions {
    display: none;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .video-player {
    gap: 32px;
  }

  .grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .shelf {
    padding: 24px 20px;
    gap: 10px;
  }

  .book {
    width: 80px;
    height: 130px;
    font-size: 0.65rem;
  }

  .book-preview {
    max-width: 240px;
  }
}

@media (max-width: 720px) {
  .header-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 12px;
  }

  .brand-title span {
    display: none;
  }

  .hero-badge {
    right: 50%;
    transform: translateX(50%);
    top: 14px;
    font-size: 0.75rem;
  }

  .hero-bg {
    inset: auto -30% -20% auto;
    width: 240px;
    height: 240px;
  }

  .video-player {
    gap: 24px;
  }

  .video-meta {
    gap: 14px;
    padding-bottom: 16px;
  }

  .video-meta h1 {
    font-size: clamp(1.4rem, 3vw, 2rem);
  }

  .video-meta p {
    font-size: 1rem;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .feature-card {
    padding: 20px;
  }

  .feature-icon {
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }

  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
  }

  .grade-tabs {
    gap: 12px;
    padding-bottom: 16px;
  }

  .grade-tab {
    padding: 10px 20px;
    font-size: 1rem;
  }

  .shelf {
    padding: 20px 16px;
    gap: 8px;
    transform: rotateX(1deg);
  }

  .book {
    width: 70px;
    height: 120px;
    font-size: 0.6rem;
    padding: 12px 6px;
  }

  .book:hover {
    transform: translateY(-20px) rotateZ(4deg) scale(1.05);
  }

  .book-preview {
    max-width: 220px;
    padding: 14px 16px;
    font-size: 0.85rem;
  }

  .bookshelf-section {
    margin-bottom: 48px;
  }

  .bookshelf-section h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    transition: none;
  }

  .btn,
  .hero-card,
  .feature-card,
  .media-card,
  .timeline-item,
  .testimonial,
  .library-card,
  .stat-card,
  .grade-card {
    transition: none;
  }
}

/* ---------- Vazirmatn RD UI FD (فارسی ارقام) ---------- */
@font-face {
  font-family: "Vazirmatn RD UI FD";
  src: url("../fonts/Vazirmatn/Round-Dots/misc/UI-Farsi-Digits/fonts/webfonts/Vazirmatn-RD-UI-FD-Regular.woff2")
    format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Vazirmatn RD UI FD";
  src: url("../fonts/Vazirmatn/Round-Dots/misc/UI-Farsi-Digits/fonts/webfonts/Vazirmatn-RD-UI-FD-Bold.woff2")
    format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* اگر وزن Medium یا سایر وزن‌ها لازم است، اضافه کنید. مثلاً: */
@font-face {
  font-family: "Vazirmatn RD UI FD";
  src: url("../fonts/Vazirmatn/Round-Dots/misc/UI-Farsi-Digits/fonts/webfonts/Vazirmatn-RD-UI-FD-Medium.woff2")
    format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* ---------- Vazirmatn RD UI (بدون ارقام فارسی) ---------- */
@font-face {
  font-family: "Vazirmatn RD UI";
  src: url("../fonts/Vazirmatn/Round-Dots/misc/UI/fonts/webfonts/Vazirmatn-RD-UI-Regular.woff2")
    format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Vazirmatn RD UI";
  src: url("../fonts/Vazirmatn/Round-Dots/misc/UI/fonts/webfonts/Vazirmatn-RD-UI-Bold.woff2")
    format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}