/* ================ VARIABLES ================ */
:root {
  --accent-3: #22d3ee;
  --radius-xl: 34px; --radius-lg: 26px; --radius-md: 20px; --radius-sm: 14px;
  --spring: cubic-bezier(0.2, 0.9, 0.3, 1);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}
html[data-theme="light"] {
  --bg: #f4f5f9; --bg-grad: radial-gradient(circle at 50% 40%, #eef0f8 0%, #e6e9f2 70%);
  --text: #0d0e12; --text-soft: rgba(13,14,18,0.72); --text-mute: rgba(13,14,18,0.52);
  --glass-bg: linear-gradient(135deg, rgba(255,255,255,0.75), rgba(255,255,255,0.45) 60%, rgba(255,255,255,0.6));
  --glass-bg-strong: linear-gradient(135deg, rgba(255,255,255,0.88), rgba(255,255,255,0.65));
  --glass-border: rgba(255,255,255,0.9); --glass-border-strong: rgba(255,255,255,1);
  --glass-top-light: rgba(255,255,255,0.95);
  --glass-shadow: 0 20px 50px -20px rgba(31,41,55,0.18);
  --glass-shadow-hover: 0 35px 70px -25px rgba(31,41,55,0.28);
  --overlay-bg: rgba(240,242,248,0.65);
  --border-soft: rgba(13,14,18,0.06); --border-strong: rgba(13,14,18,0.12);
  --orb-1: #a78bfa; --orb-2: #67e8f9; --orb-3: #f9a8d4; --orb-4: #93c5fd;
  --orb-opacity: 0.45; --orb-blur: 130px;
  --warn-bg: rgba(251,191,36,0.12); --warn-border: rgba(251,191,36,0.4); --warn-text: #b45309;
  --vpn-bg: rgba(59,130,246,0.1); --vpn-border: rgba(59,130,246,0.32); --vpn-text: #1d4ed8;
}
html[data-theme="dark"] {
  --bg: #030305; --bg-grad: radial-gradient(circle at 50% 40%, #0a0c14 0%, #030305 70%);
  --text: #ffffff; --text-soft: rgba(255,255,255,0.72); --text-mute: rgba(255,255,255,0.48);
  --glass-bg: linear-gradient(135deg, rgba(255,255,255,0.09), rgba(255,255,255,0.03) 60%, rgba(255,255,255,0.05));
  --glass-bg-strong: linear-gradient(135deg, rgba(255,255,255,0.13), rgba(255,255,255,0.05));
  --glass-border: rgba(255,255,255,0.11); --glass-border-strong: rgba(255,255,255,0.18);
  --glass-top-light: rgba(255,255,255,0.22);
  --glass-shadow: 0 20px 50px -20px rgba(0,0,0,0.7);
  --glass-shadow-hover: 0 35px 70px -25px rgba(0,0,0,0.85);
  --overlay-bg: rgba(3,3,5,0.65);
  --border-soft: rgba(255,255,255,0.06); --border-strong: rgba(255,255,255,0.12);
  --orb-1: #7c3aed; --orb-2: #06b6d4; --orb-3: #ec4899; --orb-4: #3b82f6;
  --orb-opacity: 0.55; --orb-blur: 110px;
  --warn-bg: rgba(251,191,36,0.1); --warn-border: rgba(251,191,36,0.3); --warn-text: #fcd34d;
  --vpn-bg: rgba(59,130,246,0.12); --vpn-border: rgba(59,130,246,0.35); --vpn-text: #93c5fd;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: 'Vazirmatn', -apple-system, BlinkMacSystemFont, "SF Pro", system-ui, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.75;
  min-height: 100vh; display: flex; flex-direction: column;
  overflow-x: hidden; letter-spacing: -0.005em; padding-top: 100px;
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
}
body.loading { overflow: hidden; }
a { color: inherit; text-decoration: none; cursor: pointer; }
button { font-family: inherit; }
.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* PRELOADER */
.preloader { position: fixed; inset: 0; z-index: 9999; display: flex; align-items: center; justify-content: center; background: var(--bg-grad); transition: opacity 0.7s var(--ease), visibility 0.7s; }
.preloader.hide { opacity: 0; visibility: hidden; pointer-events: none; }
.preloader-inner { display: flex; flex-direction: column; align-items: center; gap: 26px; animation: preloaderIn 0.8s var(--spring) both; }
@keyframes preloaderIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.preloader-logo { font-size: 2.6rem; font-weight: 800; letter-spacing: -0.03em; background: linear-gradient(135deg, #c4b5fd, #a78bfa 40%, #22d3ee); background-size: 200% 200%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: gradientMove 4s ease infinite; display: flex; align-items: center; gap: 12px; }
.preloader-logo::before { content: '</>'; font-size: 1.2rem; font-weight: 700; -webkit-text-fill-color: #22d3ee; color: #22d3ee; opacity: 0.9; }
.preloader-bar { width: 220px; height: 5px; border-radius: 999px; background: var(--border-soft); overflow: hidden; }
.preloader-bar-fill { height: 100%; width: 0%; border-radius: 999px; background: linear-gradient(90deg, #a78bfa, #6366f1, #22d3ee); box-shadow: 0 0 12px rgba(139,92,246,0.6); animation: fillBar 1.8s var(--ease) forwards; }
@keyframes fillBar { 0% { width: 0%; } 40% { width: 45%; } 70% { width: 75%; } 100% { width: 100%; } }

/* AMBIENT */
.ambient { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.orb { position: absolute; border-radius: 50%; filter: blur(var(--orb-blur)); will-change: transform; }
.orb.o1 { width: 620px; height: 620px; background: radial-gradient(circle at 30% 30%, var(--orb-1), transparent 70%); top: -220px; right: -180px; opacity: var(--orb-opacity); animation: drift1 26s ease-in-out infinite; }
.orb.o2 { width: 700px; height: 700px; background: radial-gradient(circle at 60% 40%, var(--orb-2), transparent 70%); bottom: -280px; left: -220px; opacity: calc(var(--orb-opacity) - 0.1); animation: drift2 32s ease-in-out infinite; }
.orb.o3 { width: 520px; height: 520px; background: radial-gradient(circle at 50% 50%, var(--orb-3), transparent 70%); top: 40%; left: 30%; opacity: calc(var(--orb-opacity) - 0.15); animation: drift3 38s ease-in-out infinite; }
.orb.o4 { width: 460px; height: 460px; background: radial-gradient(circle at 50% 50%, var(--orb-4), transparent 70%); top: 10%; left: -10%; opacity: calc(var(--orb-opacity) - 0.12); animation: drift1 30s ease-in-out infinite reverse; }
@keyframes drift1 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(-70px,60px) scale(1.1); } }
@keyframes drift2 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(90px,-80px) scale(1.05); } }
@keyframes drift3 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(-50px,-100px) scale(0.95); } }

/* NAV */
.site-header { position: fixed; top: 18px; left: 50%; transform: translateX(-50%); z-index: 50; width: calc(100% - 32px); max-width: 1160px; pointer-events: none; }
.nav-pill { pointer-events: auto; display: flex; align-items: center; justify-content: space-between; height: 62px; padding: 0 22px; border-radius: 999px; background: var(--glass-bg); backdrop-filter: blur(30px) saturate(180%); -webkit-backdrop-filter: blur(30px) saturate(180%); border: 1px solid var(--glass-border); box-shadow: inset 0 1px 0 var(--glass-top-light), 0 20px 50px -20px rgba(0,0,0,0.15); position: relative; overflow: hidden; }
.nav-pill::before { content: ''; position: absolute; top: 0; left: 8%; right: 8%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.logo { font-size: 1.15rem; font-weight: 800; display: flex; align-items: center; gap: 8px; cursor: pointer; background: linear-gradient(135deg, #a78bfa, #22d3ee); -webkit-background-clip: text; background-clip: text; color: transparent; position: relative; z-index: 1; }
.logo::before { content: '</>'; font-size: 0.85rem; font-weight: 700; -webkit-text-fill-color: var(--accent-3); opacity: 0.9; }
.nav { display: flex; gap: 6px; align-items: center; position: relative; z-index: 1; }
.nav a { color: var(--text-soft); padding: 9px 18px; border-radius: 999px; font-weight: 500; font-size: 0.9rem; transition: all 0.4s var(--spring); border: 1px solid transparent; }
.nav a:hover { color: var(--text); background: rgba(139,92,246,0.08); }
.nav a.active { color: var(--text); background: var(--glass-bg-strong); border-color: var(--glass-border-strong); box-shadow: inset 0 1px 0 var(--glass-top-light); }
.theme-toggle { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--glass-border); background: var(--glass-bg); color: var(--text); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; transition: all 0.4s var(--spring); margin-right: 6px; position: relative; overflow: hidden; }
.theme-toggle:hover { transform: rotate(20deg) scale(1.08); }
.theme-toggle .icon-sun, .theme-toggle .icon-moon { position: absolute; transition: opacity 0.4s var(--ease), transform 0.5s var(--spring); }
html[data-theme="light"] .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
html[data-theme="light"] .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.5); }
html[data-theme="dark"] .icon-sun { opacity: 0; transform: rotate(90deg) scale(0.5); }
html[data-theme="dark"] .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* BUTTONS */
.btn { position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 16px 36px; border-radius: 999px; font-family: inherit; font-size: 1rem; font-weight: 700; border: none; cursor: pointer; transition: all 0.5s var(--spring); overflow: hidden; white-space: nowrap; }
.btn-primary { color: #fff; background: linear-gradient(135deg, #a78bfa, #6366f1 45%, #22d3ee); box-shadow: inset 0 1px 0 rgba(255,255,255,0.45), 0 20px 45px -12px rgba(139,92,246,0.55), 0 4px 16px -4px rgba(34,211,238,0.4); isolation: isolate; }
.btn-primary::before { content: ''; position: absolute; inset: 0; border-radius: inherit; background: linear-gradient(180deg, rgba(255,255,255,0.28), transparent 55%); z-index: 1; }
.btn-primary::after { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.35) 50%, transparent 70%); transition: left 0.8s var(--ease); }
.btn-primary:hover::after { left: 100%; }
.btn-primary:hover { transform: translateY(-3px) scale(1.015); }
.btn-sm { padding: 12px 24px; font-size: 0.88rem; font-weight: 600; }

/* HERO */
.hero { padding: 70px 0 90px; text-align: center; }
.hero .badge-top { display: inline-flex; align-items: center; gap: 10px; padding: 9px 20px; border-radius: 999px; background: var(--glass-bg); border: 1px solid var(--glass-border); box-shadow: inset 0 1px 0 var(--glass-top-light), 0 8px 24px -8px rgba(0,0,0,0.1); color: var(--text-soft); font-size: 0.82rem; font-weight: 600; margin-bottom: 32px; animation: fadeUp 0.7s var(--spring) both; }
.hero .badge-top::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: #22d3ee; box-shadow: 0 0 12px #22d3ee; animation: pulseDot 2.4s ease-in-out infinite; }
@keyframes pulseDot { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.55; transform: scale(0.85); } }
.hero h1 { font-size: clamp(2.3rem, 6.5vw, 4.2rem); font-weight: 800; letter-spacing: -0.045em; margin-bottom: 26px; line-height: 1.22; animation: fadeUp 0.85s var(--spring) 0.05s both; }
.hero h1 .grad { background: linear-gradient(115deg, #8b5cf6, #a78bfa 30%, #22d3ee 60%, #ec4899); background-size: 250% 250%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: gradientMove 8s ease infinite; display: inline-block; }
@keyframes gradientMove { 0%,100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.hero p { color: var(--text-soft); font-size: 1.12rem; max-width: 620px; margin: 0 auto 44px; animation: fadeUp 0.95s var(--spring) 0.1s both; }
.hero .btn { animation: fadeUp 1.05s var(--spring) 0.15s both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* FEATURES */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; padding: 30px 0 100px; }
.feature { background: var(--glass-bg); backdrop-filter: blur(28px) saturate(180%); -webkit-backdrop-filter: blur(28px) saturate(180%); border: 1px solid var(--glass-border); border-radius: var(--radius-lg); padding: 32px; box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow); transition: all 0.55s var(--spring); position: relative; overflow: hidden; }
.feature::before { content: ''; position: absolute; top: 0; left: 15%; right: 15%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.feature:hover { transform: translateY(-6px); border-color: var(--glass-border-strong); box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow-hover); }
.feature .icon { width: 56px; height: 56px; display: flex; align-items: center; justify-content: center; font-size: 1.7rem; background: var(--glass-bg-strong); border: 1px solid var(--glass-border-strong); border-radius: 18px; margin-bottom: 20px; }
.feature h3 { font-size: 1.12rem; margin-bottom: 8px; font-weight: 700; }
.feature p { color: var(--text-soft); font-size: 0.93rem; }

/* PAGE HEADER */
.page-header { padding: 40px 0 30px; text-align: center; }
.page-header h1 { font-size: clamp(1.9rem, 4.5vw, 2.7rem); font-weight: 800; letter-spacing: -0.035em; margin-bottom: 12px; background: linear-gradient(135deg, var(--text), #8b5cf6 60%, #22d3ee); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-header p { color: var(--text-soft); font-size: 1.02rem; }
.section { padding: 40px 0 60px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 20px; }

/* CARD */
.card { background: var(--glass-bg); backdrop-filter: blur(28px) saturate(180%); -webkit-backdrop-filter: blur(28px) saturate(180%); border: 1px solid var(--glass-border); border-radius: var(--radius-lg); padding: 30px; cursor: pointer; display: flex; flex-direction: column; box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow); transition: all 0.55s var(--spring); position: relative; overflow: hidden; }
.card::before { content: ''; position: absolute; top: 0; left: 15%; right: 15%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.card:hover { transform: translateY(-8px); border-color: var(--glass-border-strong); background: var(--glass-bg-strong); box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow-hover), 0 0 80px -20px rgba(139,92,246,0.35); }
.card .card-icon { width: 62px; height: 62px; display: flex; align-items: center; justify-content: center; font-size: 1.9rem; background: var(--glass-bg-strong); border: 1px solid var(--glass-border-strong); border-radius: 20px; margin-bottom: 20px; transition: transform 0.55s var(--spring); }
.card:hover .card-icon { transform: scale(1.08) rotate(-5deg); }
.card h3 { font-size: 1.18rem; margin-bottom: 10px; font-weight: 700; }
.card p { color: var(--text-soft); font-size: 0.92rem; margin-bottom: 22px; flex: 1; }
.card .card-meta { display: flex; justify-content: space-between; align-items: center; color: var(--text-mute); font-size: 0.84rem; padding-top: 18px; border-top: 1px solid var(--border-soft); }
.card .card-meta .arrow { color: #8b5cf6; font-weight: 600; display: inline-flex; gap: 6px; transition: gap 0.4s var(--spring); }
.card:hover .card-meta .arrow { gap: 12px; }

/* SECTION CARD */
.section-card { position: relative; background: var(--glass-bg); backdrop-filter: blur(28px) saturate(180%); -webkit-backdrop-filter: blur(28px) saturate(180%); border: 1px solid var(--glass-border); border-radius: var(--radius-lg); padding: 28px; cursor: pointer; display: flex; align-items: center; gap: 20px; box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow); transition: all 0.5s var(--spring); overflow: hidden; }
.section-card::before { content: ''; position: absolute; top: 0; left: 15%; right: 15%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.section-card:hover { transform: translateY(-6px); border-color: var(--glass-border-strong); background: var(--glass-bg-strong); box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow-hover), 0 0 60px -15px rgba(139,92,246,0.35); }
.section-card .sc-num { width: 60px; height: 60px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 1.4rem; font-weight: 800; background: linear-gradient(135deg, #a78bfa, #22d3ee); color: #fff; border-radius: 18px; box-shadow: 0 12px 28px -10px rgba(139,92,246,0.6); }
.section-card .sc-content { flex: 1; }
.section-card h3 { font-size: 1.15rem; margin-bottom: 6px; font-weight: 700; }
.section-card .sc-meta { color: var(--text-mute); font-size: 0.85rem; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.section-card .sc-arrow { color: #8b5cf6; font-weight: 700; font-size: 1.3rem; transition: transform 0.4s var(--spring); flex-shrink: 0; }
.section-card:hover .sc-arrow { transform: translateX(-6px); }

/* COURSE CARD */
.course-card { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 20px; background: var(--glass-bg); backdrop-filter: blur(28px) saturate(180%); -webkit-backdrop-filter: blur(28px) saturate(180%); border: 1px solid var(--glass-border); border-radius: var(--radius-md); padding: 22px 26px; box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow); transition: all 0.5s var(--spring); margin-bottom: 14px; position: relative; overflow: hidden; }
.course-card::before { content: ''; position: absolute; top: 0; left: 20%; right: 20%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.course-card:hover { border-color: var(--glass-border-strong); transform: translateX(-4px); box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow-hover); }
.course-card h4 { font-size: 1.05rem; margin-bottom: 10px; font-weight: 700; }
.course-card .meta { color: var(--text-mute); font-size: 0.84rem; display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

/* BADGE */
.badge { display: inline-flex; align-items: center; padding: 4px 12px; border-radius: 999px; font-size: 0.72rem; font-weight: 700; background: linear-gradient(135deg, rgba(167,139,250,0.18), rgba(139,92,246,0.1)); color: #7c3aed; border: 1px solid rgba(167,139,250,0.4); }
html[data-theme="dark"] .badge { color: #c4b5fd; }
.badge-green { background: linear-gradient(135deg, rgba(16,185,129,0.18), rgba(16,185,129,0.08)); color: #059669; border-color: rgba(16,185,129,0.4); }
html[data-theme="dark"] .badge-green { color: #6ee7b7; }

/* PREREQ */
.prereq-note { display: flex; align-items: flex-start; gap: 14px; padding: 20px 22px; margin-bottom: 34px; border-radius: 20px; background: var(--warn-bg); border: 1px solid var(--warn-border); }
.prereq-note .prereq-icon { font-size: 1.5rem; flex-shrink: 0; }
.prereq-note strong { color: var(--warn-text); font-weight: 700; display: block; margin-bottom: 4px; font-size: 0.95rem; }
.prereq-note p { color: var(--text-soft); font-size: 0.9rem; margin: 0; }
.prereq-note a { color: #8b5cf6; font-weight: 600; text-decoration: underline; }

/* BREADCRUMB */
.breadcrumb { color: var(--text-mute); font-size: 0.88rem; margin: 32px 0 20px; display: flex; align-items: center; flex-wrap: wrap; }
.breadcrumb a:hover { color: #8b5cf6; }
.breadcrumb .sep { margin: 0 10px; opacity: 0.4; }

/* COURSE DETAIL */
.course-detail { display: grid; grid-template-columns: 1fr 340px; gap: 28px; padding: 24px 0 80px; }
.course-main { background: var(--glass-bg); backdrop-filter: blur(30px) saturate(180%); -webkit-backdrop-filter: blur(30px) saturate(180%); border: 1px solid var(--glass-border); border-radius: var(--radius-xl); padding: 40px; box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow); position: relative; overflow: hidden; }
.course-main::before { content: ''; position: absolute; top: 0; left: 20%; right: 20%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.course-main h1 { font-size: 1.75rem; margin-bottom: 18px; font-weight: 800; }
.course-main h2 { font-size: 1.18rem; margin: 32px 0 16px; font-weight: 700; display: flex; align-items: center; gap: 12px; }
.course-main h2::before { content: ''; width: 4px; height: 22px; background: linear-gradient(180deg, #a78bfa, #22d3ee); border-radius: 4px; }
.course-main p { color: var(--text-soft); margin-bottom: 16px; }
.course-main ul { padding-right: 4px; color: var(--text-soft); list-style: none; }
.course-main li { margin-bottom: 12px; padding-right: 26px; position: relative; }
.course-main li::before { content: ''; position: absolute; right: 0; top: 12px; width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(135deg, #a78bfa, #22d3ee); }
.course-side { position: sticky; top: 100px; height: fit-content; background: var(--glass-bg-strong); backdrop-filter: blur(34px) saturate(200%); -webkit-backdrop-filter: blur(34px) saturate(200%); border: 1px solid var(--glass-border-strong); border-radius: var(--radius-xl); padding: 32px; box-shadow: inset 0 1px 0 var(--glass-top-light), var(--glass-shadow-hover); }
.course-side .price { font-size: 2rem; font-weight: 800; margin-bottom: 6px; background: linear-gradient(135deg, #22d3ee, #8b5cf6 50%, #ec4899); background-size: 200% 200%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: gradientMove 6s ease infinite; }
.course-side .price-sub { color: var(--text-mute); font-size: 0.85rem; margin-bottom: 22px; }
.course-side .btn { width: 100%; }
.course-side hr { border: none; border-top: 1px solid var(--border-soft); margin: 24px 0; }
.course-side .info-row { display: flex; justify-content: space-between; font-size: 0.88rem; color: var(--text-mute); margin-bottom: 12px; }
.course-side .info-row span:last-child { color: var(--text); font-weight: 600; }

/* MODAL */
.modal-overlay { position: fixed; inset: 0; background: var(--overlay-bg); backdrop-filter: blur(20px) saturate(160%); -webkit-backdrop-filter: blur(20px) saturate(160%); display: none; align-items: center; justify-content: center; z-index: 100; padding: 20px; animation: fadeIn 0.3s var(--ease); }
.modal-overlay.active { display: flex; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalPop { from { transform: translateY(30px) scale(0.94); opacity: 0; } to { transform: translateY(0) scale(1); opacity: 1; } }
.modal { position: relative; max-width: 500px; width: 100%; padding: 40px 34px; border-radius: 32px; background: var(--glass-bg-strong); backdrop-filter: blur(40px) saturate(200%); -webkit-backdrop-filter: blur(40px) saturate(200%); border: 1px solid var(--glass-border-strong); box-shadow: inset 0 1px 0 var(--glass-top-light), 0 50px 100px -30px rgba(0,0,0,0.35); animation: modalPop 0.5s var(--spring); overflow: hidden; max-height: 90vh; overflow-y: auto; }
.modal::before { content: ''; position: absolute; top: 0; left: 15%; right: 15%; height: 1px; background: linear-gradient(90deg, transparent, var(--glass-top-light), transparent); }
.modal h3 { font-size: 1.45rem; margin-bottom: 10px; text-align: center; font-weight: 800; position: relative; z-index: 1; }
.modal .modal-sub { color: var(--text-soft); text-align: center; margin-bottom: 26px; font-size: 0.94rem; position: relative; z-index: 1; }
.platform-btn { position: relative; display: flex; flex-direction: column; align-items: center; gap: 8px; width: 100%; padding: 24px 20px; margin-bottom: 12px; border-radius: 22px; background: var(--glass-bg); border: 1px solid var(--glass-border-strong); color: var(--text); cursor: pointer; font-weight: 700; overflow: hidden; z-index: 1; transition: all 0.5s var(--spring); box-shadow: inset 0 1px 0 var(--glass-top-light), 0 10px 28px -12px rgba(0,0,0,0.15); }
.platform-btn::after { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.4) 50%, transparent 70%); transition: left 0.9s var(--ease); }
.platform-btn:hover::after { left: 100%; }
.platform-btn:hover { border-color: rgba(139,92,246,0.5); transform: translateY(-3px); box-shadow: inset 0 1px 0 var(--glass-top-light), 0 25px 50px -15px rgba(139,92,246,0.4); }
.platform-btn .platform-icon { font-size: 2.2rem; }
.platform-btn .platform-name { font-size: 1.05rem; }
.platform-btn .platform-hint { font-size: 0.78rem; color: var(--text-mute); font-weight: 500; }
.copy-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; padding: 14px 20px; margin-bottom: 16px; border-radius: 16px; background: var(--glass-bg); border: 1px dashed var(--glass-border-strong); color: var(--text-soft); cursor: pointer; font-family: inherit; font-size: 0.9rem; font-weight: 600; transition: all 0.4s var(--spring); position: relative; z-index: 1; }
.copy-btn:hover { color: var(--text); border-style: solid; border-color: rgba(139,92,246,0.5); background: var(--glass-bg-strong); }
.vpn-note { display: flex; align-items: flex-start; gap: 12px; padding: 14px 18px; margin-bottom: 14px; border-radius: 16px; background: var(--vpn-bg); border: 1px solid var(--vpn-border); position: relative; z-index: 1; }
.vpn-note .vpn-icon { font-size: 1.2rem; flex-shrink: 0; line-height: 1.5; }
.vpn-note p { color: var(--text-soft); font-size: 0.85rem; line-height: 1.85; margin: 0; }
.vpn-note strong { color: var(--vpn-text); font-weight: 700; }
.copy-note { display: flex; align-items: flex-start; gap: 12px; padding: 14px 18px; margin-bottom: 20px; border-radius: 16px; background: linear-gradient(135deg, rgba(34,211,238,0.1), rgba(167,139,250,0.08)); border: 1px solid rgba(34,211,238,0.28); position: relative; z-index: 1; }
.copy-note-icon { font-size: 1.2rem; flex-shrink: 0; line-height: 1.5; }
.copy-note p { color: var(--text-soft); font-size: 0.85rem; line-height: 1.85; margin: 0; }
.copy-note strong { color: #0891b2; font-weight: 700; }
html[data-theme="dark"] .copy-note strong { color: var(--accent-3); }
.modal-close { display: block; margin: 4px auto 0; background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-soft); cursor: pointer; padding: 11px 28px; border-radius: 999px; font-size: 0.88rem; transition: all 0.3s var(--spring); position: relative; z-index: 1; }
.modal-close:hover { color: var(--text); border-color: var(--glass-border-strong); background: var(--glass-bg-strong); }

/* TOAST */
.toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(140px); padding: 16px 26px; border-radius: 20px; background: var(--glass-bg-strong); backdrop-filter: blur(30px) saturate(200%); -webkit-backdrop-filter: blur(30px) saturate(200%); border: 1px solid rgba(16,185,129,0.5); color: var(--text); font-weight: 600; font-size: 0.92rem; display: flex; align-items: center; gap: 12px; z-index: 200; box-shadow: inset 0 1px 0 var(--glass-top-light), 0 30px 60px -20px rgba(0,0,0,0.4); transition: transform 0.5s var(--spring); }
.toast.show { transform: translateX(-50%) translateY(0); }
.toast .dot { width: 9px; height: 9px; border-radius: 50%; background: #10b981; box-shadow: 0 0 12px #10b981; }

/* FOOTER */
.site-footer { margin-top: auto; padding: 40px 0; color: var(--text-mute); text-align: center; font-size: 0.88rem; position: relative; }
.site-footer::before { content: ''; position: absolute; top: 0; left: 30%; right: 30%; height: 1px; background: linear-gradient(90deg, transparent, var(--border-strong), transparent); }
.empty { text-align: center; padding: 80px 20px; color: var(--text-soft); }
.empty h2 { color: var(--text); margin-bottom: 12px; font-size: 1.5rem; }

@media (max-width: 860px) {
  .course-detail { grid-template-columns: 1fr; }
  .course-side { position: static; }
}
@media (max-width: 640px) {
  body { padding-top: 88px; }
  .container { padding: 0 18px; }
  .nav-pill { padding: 0 12px; height: 58px; border-radius: 24px; }
  .logo { font-size: 1rem; }
  .logo::before { display: none; }
  .nav a { padding: 7px 12px; font-size: 0.82rem; }
  .theme-toggle { width: 36px; height: 36px; font-size: 1rem; }
  .hero { padding: 50px 0 60px; }
  .features { padding: 20px 0 60px; }
  .course-card { grid-template-columns: 1fr; padding: 20px; }
  .course-card .btn { width: 100%; }
  .card { padding: 26px; }
  .modal { padding: 32px 22px; border-radius: 28px; }
  .course-main { padding: 28px; }
  .course-side { padding: 26px; }
  .preloader-logo { font-size: 2.1rem; }
  .section-card { padding: 22px; gap: 14px; }
  .section-card .sc-num { width: 50px; height: 50px; font-size: 1.15rem; border-radius: 14px; }
  .section-card h3 { font-size: 1rem; }
}