/* ═══════════════════════════════════════════════════════════════
   Scholar Naija — materials.css
   Course PDF Library · Premium Dark Academic Design System
   Creator: Nassir Al-Barnawi
   ═══════════════════════════════════════════════════════════════ */

/* ── TOKENS ── */
:root {
  --bg:          #07090F;
  --bg-2:        #0D1117;
  --surface:     #111827;
  --surface-2:   #1A2235;
  --surface-3:   #1E2D45;
  --border:      rgba(255,255,255,0.07);
  --border-md:   rgba(255,255,255,0.12);

  --blue:        #3B82F6;
  --blue-d:      #2563EB;
  --blue-dim:    rgba(59,130,246,0.12);
  --blue-bd:     rgba(59,130,246,0.25);

  --green:       #10B981;
  --green-dim:   rgba(16,185,129,0.1);
  --green-bd:    rgba(16,185,129,0.22);

  --amber:       #F59E0B;
  --amber-dim:   rgba(245,158,11,0.1);
  --amber-bd:    rgba(245,158,11,0.22);

  --purple:      #8B5CF6;
  --purple-dim:  rgba(139,92,246,0.1);
  --purple-bd:   rgba(139,92,246,0.22);

  --red:         #EF4444;
  --red-dim:     rgba(239,68,68,0.1);

  --text:        #E8F0FF;
  --text-2:      #94A3B8;
  --text-3:      #4B5A72;

  --font-display:'Space Grotesk', system-ui, sans-serif;
  --font-body:   'Inter', system-ui, sans-serif;
  --font-mono:   'JetBrains Mono', monospace;

  --r:    10px;
  --r-sm: 6px;
  --r-lg: 16px;
  --r-xl: 22px;
  --ease: cubic-bezier(0.4,0,0.2,1);
  --dur:  0.25s;

  --shadow:    0 4px 24px rgba(0,0,0,0.45);
  --shadow-sm: 0 2px 10px rgba(0,0,0,0.3);
  --glow-blue: 0 0 40px rgba(59,130,246,0.14);
  --glow-green:0 0 40px rgba(16,185,129,0.12);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
a { color: var(--blue); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: var(--amber); }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--blue-d); border-radius: 2px; }
::selection { background: var(--blue); color: var(--bg); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 4px; }
.hidden { display: none !important; }

/* ── PROGRESS ── */
.ml-progress {
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--blue), var(--green));
  z-index: 9999; transition: width 0.08s linear;
}


/* ════════════════════════════════════════════════════════════
   HEADER
════════════════════════════════════════════════════════════ */
.ml-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.ml-header--solid {
  background: rgba(7,9,15,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border), var(--shadow-sm);
}
.ml-header__inner {
  max-width: 1400px; margin: 0 auto;
  padding: 0 clamp(16px,3vw,36px);
  height: 66px;
  display: flex; align-items: center; gap: 20px;
}
.ml-logo {
  display: flex; align-items: center; gap: 8px;
  color: var(--text); flex-shrink: 0;
}
.ml-logo:hover { color: var(--text); }
.ml-logo__icon { font-size: 1.2rem; }
.ml-logo__name { font-family: var(--font-display); font-size: 1.05rem; font-weight: 500; color: var(--text-2); }
.ml-logo__name b { color: var(--blue); font-weight: 800; }

.ml-nav { display: flex; align-items: center; gap: 2px; flex: 1; overflow-x: auto; scrollbar-width: none; }
.ml-nav::-webkit-scrollbar { display: none; }
.ml-nav__link { color: var(--text-2); font-size: 0.82rem; font-weight: 500; padding: 6px 10px; border-radius: var(--r-sm); white-space: nowrap; transition: all var(--dur) var(--ease); }
.ml-nav__link:hover, .ml-nav__link--active { color: var(--text); background: rgba(255,255,255,0.05); }
.ml-nav__link--active { color: var(--blue) !important; }

.ml-header__actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.ml-upload-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--blue); color: #fff;
  font-size: 0.8rem; font-weight: 700; padding: 8px 16px;
  border-radius: 50px; transition: all var(--dur) var(--ease);
}
.ml-upload-btn:hover { background: var(--blue-d); transform: translateY(-1px); }

.ml-burger { display: none; flex-direction: column; gap: 4px; padding: 8px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-sm); }
.ml-burger span { display: block; width: 18px; height: 2px; background: var(--text-2); border-radius: 2px; transition: all var(--dur) var(--ease); }

.ml-mobile-nav { display: none; flex-direction: column; gap: 4px; background: var(--surface); border-top: 1px solid var(--border); padding: 12px 16px; }
.ml-mobile-nav--open { display: flex; }
.ml-mn-link { display: block; color: var(--text-2); font-size: 0.95rem; font-weight: 600; padding: 11px 14px; border-radius: var(--r-sm); border-left: 2px solid transparent; transition: all var(--dur) var(--ease); }
.ml-mn-link:hover { color: var(--blue); background: var(--blue-dim); border-left-color: var(--blue); }


/* ════════════════════════════════════════════════════════════
   HERO
════════════════════════════════════════════════════════════ */
.ml-hero {
  min-height: 75vh; display: flex; align-items: center;
  padding: clamp(100px,12vw,130px) clamp(16px,5vw,60px) clamp(56px,8vw,80px);
  position: relative; overflow: hidden; background: var(--bg);
}
.ml-hero__bg { position: absolute; inset: 0; pointer-events: none; }
.ml-hero__grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  -mask-image: radial-gradient(ellipse 80% 80% at 50% 30%, black 30%, transparent 100%);
}
.ml-hero__glow { position: absolute; border-radius: 50%; filter: blur(100px); }
.ml-hero__glow--1 { width: 500px; height: 500px; background: radial-gradient(circle, rgba(59,130,246,0.15), transparent 65%); top: -100px; right: -50px; }
.ml-hero__glow--2 { width: 400px; height: 400px; background: radial-gradient(circle, rgba(16,185,129,0.08), transparent 65%); bottom: -60px; left: 10%; animation: heroGlow 10s ease-in-out infinite; }
.ml-orb { position: absolute; border-radius: 50%; border: 1px solid rgba(59,130,246,0.06); }
.ml-orb--1 { width: 600px; height: 600px; top: -200px; right: -200px; }
.ml-orb--2 { width: 400px; height: 400px; top: -100px; right: -100px; }
@keyframes heroGlow { 0%,100% { opacity: 0.6; transform: scale(1); } 50% { opacity: 1; transform: scale(1.05); } }

.ml-hero__body { position: relative; z-index: 1; max-width: 900px; width: 100%; }

.ml-hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue-dim); border: 1px solid var(--blue-bd); color: var(--blue);
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500; letter-spacing: 0.04em;
  padding: 6px 14px; border-radius: 50px; margin-bottom: 24px;
  animation: mlFadeUp 0.7s var(--ease) both;
}
.ml-badge__dot { width: 6px; height: 6px; background: var(--green); border-radius: 50%; animation: mlPulse 1.5s ease infinite; }
@keyframes mlPulse { 0%,100% { box-shadow: 0 0 0 0 rgba(16,185,129,0.6); } 50% { box-shadow: 0 0 0 5px rgba(16,185,129,0); } }

.ml-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 6rem);
  font-weight: 700; line-height: 0.95; letter-spacing: -0.04em;
  color: var(--text); margin-bottom: 20px;
  animation: mlFadeUp 0.75s var(--ease) 0.06s both;
}
.ml-hero__title--accent { color: var(--blue); display: block; }

.ml-hero__sub {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem); color: var(--text-2); font-weight: 300;
  max-width: 620px; line-height: 1.75; margin-bottom: 32px;
  animation: mlFadeUp 0.75s var(--ease) 0.12s both;
}

/* Search bar */
.ml-search-wrap {
  position: relative; max-width: 700px; margin-bottom: 28px;
  animation: mlFadeUp 0.75s var(--ease) 0.18s both;
}
.ml-search__icon { position: absolute; left: 18px; top: 50%; transform: translateY(-50%); font-size: 1rem; color: var(--text-3); pointer-events: none; }
.ml-search__input {
  width: 100%; background: var(--surface); border: 1.5px solid var(--border-md);
  border-radius: 50px; padding: 16px 140px 16px 50px;
  font-family: var(--font-body); font-size: 0.95rem; color: var(--text);
  outline: none; transition: all var(--dur) var(--ease);
}
.ml-search__input::placeholder { color: var(--text-3); }
.ml-search__input:focus { border-color: var(--blue); background: var(--surface-2); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }
.ml-search__btn {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  background: var(--blue); color: #fff; font-size: 0.85rem; font-weight: 700;
  padding: 10px 22px; border-radius: 50px; transition: all var(--dur) var(--ease);
}
.ml-search__btn:hover { background: var(--blue-d); }

/* Hero stats */
.ml-hero__stats { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; animation: mlFadeUp 0.75s var(--ease) 0.24s both; }
.ml-hero-stat { display: flex; flex-direction: column; }
.ml-hero-stat__n { font-family: var(--font-display); font-size: clamp(1.6rem,3vw,2.4rem); font-weight: 700; color: var(--blue); line-height: 1; letter-spacing: -0.02em; }
.ml-hero-stat__l { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-3); letter-spacing: 0.07em; text-transform: uppercase; margin-top: 2px; }
.ml-hero-stat__div { width: 1px; height: 36px; background: var(--border-md); flex-shrink: 0; }

/* Level tabs */
.ml-level-tabs { display: flex; gap: 8px; flex-wrap: wrap; animation: mlFadeUp 0.75s var(--ease) 0.3s both; }
.ml-level-tab {
  background: var(--surface-2); border: 1px solid var(--border-md); color: var(--text-2);
  font-family: var(--font-body); font-size: 0.8rem; font-weight: 600;
  padding: 8px 18px; border-radius: 50px; transition: all var(--dur) var(--ease); cursor: pointer;
}
.ml-level-tab:hover { border-color: var(--blue-bd); color: var(--blue); background: var(--blue-dim); }
.ml-level-tab--active { background: var(--blue); border-color: var(--blue); color: #fff !important; }

@keyframes mlFadeUp { from { opacity:0; transform: translateY(18px); } to { opacity:1; transform: translateY(0); } }


/* ════════════════════════════════════════════════════════════
   AD ZONES
════════════════════════════════════════════════════════════ */
.ml-ad { text-align: center; }
.ml-ad__label { font-family: var(--font-mono); font-size: 0.58rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-3); display: block; margin-bottom: 4px; }
.ml-ad--leader { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 8px 24px; }
.ml-ad--inline { background: rgba(255,255,255,0.02); border: 1px dashed var(--border-md); border-radius: var(--r); padding: 10px; margin: 28px 0; }
.ml-ad--sidebar { background: rgba(255,255,255,0.02); border: 1px dashed var(--border-md); border-radius: var(--r); padding: 10px; margin-top: 20px; }


/* ════════════════════════════════════════════════════════════
   SECTION WRAPPER
════════════════════════════════════════════════════════════ */
.ml-section-wrap { max-width: 1400px; margin: 0 auto; padding: 0 clamp(16px,3vw,36px); }
.ml-section-hdr { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.ml-section-title { font-family: var(--font-display); font-size: clamp(1.2rem,2.5vw,1.7rem); font-weight: 700; color: var(--text); letter-spacing: -0.02em; }
.ml-section-sub { font-size: 0.85rem; color: var(--text-2); margin-top: 4px; }
.ml-see-all-btn {
  font-family: var(--font-body); font-size: 0.8rem; font-weight: 700; color: var(--blue);
  border: 1px solid var(--blue-bd); padding: 7px 16px; border-radius: 50px;
  transition: all var(--dur) var(--ease); white-space: nowrap;
}
.ml-see-all-btn:hover { background: var(--blue-dim); }


/* ════════════════════════════════════════════════════════════
   DEPARTMENT SECTION
════════════════════════════════════════════════════════════ */
.ml-dept-section { padding: 48px 0; background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.ml-dept-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px,1fr)); gap: 12px; }
.ml-dept-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 18px 16px; display: flex; align-items: center; gap: 12px;
  cursor: pointer; transition: all var(--dur) var(--ease); text-decoration: none; color: inherit;
  position: relative; overflow: hidden;
}
.ml-dept-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform 0.35s var(--ease); }
.ml-dept-card:hover { border-color: var(--blue-bd); transform: translateY(-3px); box-shadow: var(--shadow), var(--glow-blue); }
.ml-dept-card:hover::before { transform: scaleX(1); }
.ml-dept-card--hidden { display: none; }
.ml-dept-card__icon { font-size: 1.5rem; flex-shrink: 0; }
.ml-dept-card__info { min-width: 0; }
.ml-dept-card__name { font-family: var(--font-display); font-size: 0.82rem; font-weight: 700; color: var(--text); line-height: 1.3; }
.ml-dept-card__count { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-3); margin-top: 3px; }


/* ════════════════════════════════════════════════════════════
   MAIN LAYOUT
════════════════════════════════════════════════════════════ */
.ml-main-wrap { padding: 0 clamp(16px,3vw,36px); }
.ml-main-layout {
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: 280px 1fr; gap: 36px;
  padding: 40px 0 60px; align-items: start;
}


/* ════════════════════════════════════════════════════════════
   FILTERS SIDEBAR
════════════════════════════════════════════════════════════ */
.ml-filters { position: sticky; top: 80px; }
.ml-filters__inner { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 24px; }
.ml-filters__header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.ml-filters__header h3 { font-family: var(--font-display); font-size: 0.95rem; font-weight: 700; color: var(--text); }
.ml-clear-filters { font-size: 0.75rem; font-weight: 700; color: var(--red); transition: opacity var(--dur); }
.ml-clear-filters:hover { opacity: 0.7; }

.ml-filter-group { margin-bottom: 20px; }
.ml-filter-label { display: block; font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-3); margin-bottom: 10px; }
.ml-filter-select {
  width: 100%; background: var(--bg-2); border: 1.5px solid var(--border-md); border-radius: var(--r-sm);
  padding: 10px 12px; font-family: var(--font-body); font-size: 0.85rem; color: var(--text);
  outline: none; appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234B5A72' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px;
  transition: all var(--dur) var(--ease);
}
.ml-filter-select:focus { border-color: var(--blue); }

.ml-filter-checks { display: flex; flex-direction: column; gap: 8px; }
.ml-check { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-2); cursor: pointer; transition: color var(--dur) var(--ease); }
.ml-check:hover { color: var(--text); }
.ml-check input[type=checkbox] { accent-color: var(--blue); width: 15px; height: 15px; flex-shrink: 0; cursor: pointer; }

.ml-apply-btn {
  width: 100%; background: var(--blue); color: #fff;
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 700;
  padding: 12px; border-radius: var(--r-sm); margin-top: 4px;
  transition: all var(--dur) var(--ease);
}
.ml-apply-btn:hover { background: var(--blue-d); transform: translateY(-1px); }

.ml-sidebar-promo { background: var(--surface-2); border: 1px solid var(--border-md); border-radius: var(--r); padding: 18px; margin-top: 16px; text-align: center; }
.ml-sp__icon { font-size: 1.8rem; display: block; margin-bottom: 8px; }
.ml-sidebar-promo h4 { font-family: var(--font-display); font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.ml-sidebar-promo p { font-size: 0.8rem; color: var(--text-2); line-height: 1.5; margin-bottom: 12px; }
.ml-sp__btn { display: inline-flex; align-items: center; background: var(--green); color: var(--bg); font-size: 0.8rem; font-weight: 700; padding: 8px 16px; border-radius: 50px; transition: all var(--dur) var(--ease); }
.ml-sp__btn:hover { background: #059669; color: var(--bg); transform: translateY(-1px); }


/* ════════════════════════════════════════════════════════════
   CONTENT PANEL
════════════════════════════════════════════════════════════ */
.ml-content { min-width: 0; }

/* Results header */
.ml-results-hdr { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; flex-wrap: wrap; gap: 10px; }
.ml-results-hdr__left { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ml-results-count { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-2); font-weight: 500; }
.ml-active-filters { display: flex; gap: 6px; flex-wrap: wrap; }
.ml-active-tag { display: inline-flex; align-items: center; gap: 5px; font-family: var(--font-mono); font-size: 0.65rem; background: var(--blue-dim); border: 1px solid var(--blue-bd); color: var(--blue); padding: 3px 9px; border-radius: 50px; }
.ml-active-tag button { color: var(--blue); font-size: 0.8rem; opacity: 0.7; cursor: pointer; background: none; border: none; }

.ml-results-hdr__right { display: flex; align-items: center; gap: 10px; }
.ml-toggle-filter-btn { display: none; font-size: 0.8rem; font-weight: 700; color: var(--text-2); background: var(--surface); border: 1px solid var(--border-md); padding: 7px 14px; border-radius: 50px; transition: all var(--dur) var(--ease); }
.ml-toggle-filter-btn:hover { color: var(--blue); border-color: var(--blue-bd); }
.ml-view-toggle { display: flex; gap: 4px; }
.ml-view-btn { width: 34px; height: 34px; background: var(--surface); border: 1px solid var(--border-md); border-radius: var(--r-sm); color: var(--text-2); font-size: 1rem; display: flex; align-items: center; justify-content: center; transition: all var(--dur) var(--ease); }
.ml-view-btn:hover, .ml-view-btn--active { background: var(--blue-dim); border-color: var(--blue-bd); color: var(--blue); }

/* Subsection titles */
.ml-subsection-title { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }


/* ── FEATURED SCROLL ── */
.ml-featured-section { margin-bottom: 32px; }
.ml-featured-scroll { display: flex; gap: 14px; overflow-x: auto; padding-bottom: 8px; scrollbar-width: thin; scrollbar-color: var(--blue-d) transparent; }
.ml-featured-scroll::-webkit-scrollbar { height: 3px; }
.ml-featured-scroll::-webkit-scrollbar-thumb { background: var(--blue-d); border-radius: 2px; }


/* ── POPULAR LIST ── */
.ml-popular-section { margin-bottom: 32px; }
.ml-popular-list { display: flex; flex-direction: column; gap: 8px; }
.ml-popular-item {
  display: flex; align-items: center; gap: 14px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--r); padding: 14px 18px;
  cursor: pointer; transition: all var(--dur) var(--ease);
}
.ml-popular-item:hover { border-color: var(--blue-bd); transform: translateX(4px); box-shadow: var(--shadow-sm); }
.ml-popular-num { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; color: var(--blue); background: var(--blue-dim); border: 1px solid var(--blue-bd); width: 26px; height: 26px; border-radius: 4px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.ml-popular-info { flex: 1; min-width: 0; }
.ml-popular-code { font-family: var(--font-mono); font-size: 0.65rem; font-weight: 700; color: var(--green); margin-bottom: 2px; }
.ml-popular-title { font-size: 0.88rem; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ml-popular-dept { font-size: 0.75rem; color: var(--text-2); }
.ml-popular-dl { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-3); white-space: nowrap; }


/* ── RECENT SCROLL ── */
.ml-recent-section { margin-bottom: 28px; }
.ml-recent-scroll { display: flex; gap: 14px; overflow-x: auto; padding-bottom: 8px; scrollbar-width: thin; scrollbar-color: var(--blue-d) transparent; }
.ml-recent-scroll::-webkit-scrollbar { height: 3px; }
.ml-recent-scroll::-webkit-scrollbar-thumb { background: var(--blue-d); border-radius: 2px; }


/* ════════════════════════════════════════════════════════════
   MATERIAL CARDS
════════════════════════════════════════════════════════════ */
.ml-materials-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 16px; margin-bottom: 28px; }
.ml-materials-grid--list { grid-template-columns: 1fr; }

/* Standard Material Card */
.ml-mat-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  overflow: hidden; display: flex; flex-direction: column;
  cursor: pointer; transition: all var(--dur) var(--ease);
  animation: mlCardReveal 0.4s var(--ease) both;
}
.ml-mat-card:hover { border-color: var(--blue-bd); transform: translateY(-4px); box-shadow: var(--shadow), var(--glow-blue); }

@keyframes mlCardReveal { from { opacity:0; transform: translateY(14px); } to { opacity:1; transform: translateY(0); } }

/* Card top accent */
.ml-mat-card__accent { height: 3px; }
.ml-mat-card__accent--lecture  { background: var(--blue); }
.ml-mat-card__accent--past     { background: var(--amber); }
.ml-mat-card__accent--handout  { background: var(--green); }
.ml-mat-card__accent--outline  { background: var(--purple); }
.ml-mat-card__accent--practical{ background: #EC4899; }
.ml-mat-card__accent--assign   { background: #14B8A6; }

.ml-mat-card__body { padding: 18px; flex: 1; display: flex; flex-direction: column; gap: 10px; }

.ml-mat-card__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.ml-mat-card__code { font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700; color: var(--green); background: var(--green-dim); border: 1px solid var(--green-bd); padding: 3px 8px; border-radius: 4px; white-space: nowrap; }
.ml-mat-card__type-badge { font-family: var(--font-mono); font-size: 0.6rem; font-weight: 700; padding: 3px 8px; border-radius: 4px; white-space: nowrap; }
.ml-type--lecture  { background: var(--blue-dim);   border: 1px solid var(--blue-bd);   color: var(--blue); }
.ml-type--past     { background: var(--amber-dim);  border: 1px solid var(--amber-bd);  color: var(--amber); }
.ml-type--handout  { background: var(--green-dim);  border: 1px solid var(--green-bd);  color: var(--green); }
.ml-type--outline  { background: var(--purple-dim); border: 1px solid var(--purple-bd); color: var(--purple); }
.ml-type--practical{ background: rgba(236,72,153,0.1); border: 1px solid rgba(236,72,153,0.22); color: #EC4899; }
.ml-type--assign   { background: rgba(20,184,166,0.1); border: 1px solid rgba(20,184,166,0.22); color: #14B8A6; }

.ml-mat-card__title { font-family: var(--font-display); font-size: 0.92rem; font-weight: 700; color: var(--text); line-height: 1.3; transition: color var(--dur) var(--ease); }
.ml-mat-card:hover .ml-mat-card__title { color: var(--blue); }

.ml-mat-card__dept { font-size: 0.78rem; color: var(--text-2); }
.ml-mat-card__level-sem { display: flex; gap: 6px; flex-wrap: wrap; }
.ml-mat-chip { font-family: var(--font-mono); font-size: 0.6rem; font-weight: 500; background: var(--surface-2); border: 1px solid var(--border-md); color: var(--text-3); padding: 2px 7px; border-radius: 4px; }

.ml-mat-card__stats { display: flex; gap: 12px; margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-3); }
.ml-mat-stat { display: flex; align-items: center; gap: 4px; }

.ml-mat-card__rating { display: flex; gap: 2px; margin-top: 2px; }
.ml-star-filled { color: var(--amber); font-size: 0.7rem; }
.ml-star-empty  { color: var(--text-3); font-size: 0.7rem; }

.ml-mat-card__footer { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; gap: 8px; }
.ml-preview-btn, .ml-download-btn {
  flex: 1; font-family: var(--font-body); font-size: 0.78rem; font-weight: 700;
  padding: 9px 10px; border-radius: var(--r-sm); display: flex; align-items: center; justify-content: center; gap: 5px;
  transition: all var(--dur) var(--ease);
}
.ml-preview-btn { background: var(--surface-2); border: 1px solid var(--border-md); color: var(--text-2); }
.ml-preview-btn:hover { border-color: var(--blue-bd); color: var(--blue); }
.ml-download-btn { background: var(--blue); color: #fff; }
.ml-download-btn:hover { background: var(--blue-d); transform: translateY(-1px); }

/* List view variant */
.ml-materials-grid--list .ml-mat-card { flex-direction: row; }
.ml-materials-grid--list .ml-mat-card__accent { width: 3px; height: auto; flex-shrink: 0; }
.ml-materials-grid--list .ml-mat-card__body { padding: 14px 16px; }
.ml-materials-grid--list .ml-mat-card__footer { border-top: none; border-left: 1px solid var(--border); padding: 14px 12px; flex-direction: column; width: 130px; flex-shrink: 0; }

/* Featured card (wider) */
.ml-mat-card--featured { min-width: 280px; flex-shrink: 0; }

/* Skeleton */
.ml-loading-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 16px; }
.ml-skel-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); height: 220px; background: linear-gradient(90deg, var(--surface) 25%, var(--surface-2) 50%, var(--surface) 75%); background-size: 200% 100%; animation: shimmer 1.6s infinite; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }


/* ── EMPTY STATE ── */
.ml-empty-state { text-align: center; padding: 80px 24px; }
.ml-empty__icon { font-size: 3.5rem; opacity: 0.5; display: block; margin-bottom: 14px; }
.ml-empty-state h4 { font-family: var(--font-display); font-size: 1.1rem; color: var(--text); margin-bottom: 8px; }
.ml-empty-state p { font-size: 0.9rem; color: var(--text-2); }

/* ── PAGINATION ── */
.ml-pagination { display: flex; justify-content: center; align-items: center; gap: 6px; margin-top: 32px; flex-wrap: wrap; }
.ml-page-btn {
  background: var(--surface); border: 1px solid var(--border-md); color: var(--text-2);
  font-family: var(--font-mono); font-size: 0.82rem; font-weight: 700;
  width: 38px; height: 38px; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all var(--dur) var(--ease);
}
.ml-page-btn:hover { border-color: var(--blue-bd); color: var(--blue); }
.ml-page-btn--active { background: var(--blue); border-color: var(--blue); color: #fff; }
.ml-page-btn--nav { width: auto; padding: 0 14px; gap: 5px; font-size: 0.78rem; }


/* ════════════════════════════════════════════════════════════
   REQUEST SECTION
════════════════════════════════════════════════════════════ */
.ml-request-section { padding: 60px 0; background: var(--bg-2); border-top: 1px solid var(--border); }
.ml-request-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }

.ml-request-card, .ml-contribute-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-xl); padding: 36px;
}
.ml-request-card { border-top: 3px solid var(--blue); }
.ml-contribute-card { border-top: 3px solid var(--green); }

.ml-req__icon, .ml-contrib__icon { font-size: 2.2rem; display: block; margin-bottom: 14px; }
.ml-request-card h2, .ml-contribute-card h3 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; color: var(--text); margin-bottom: 8px; letter-spacing: -0.02em; }
.ml-request-card p, .ml-contribute-card p { font-size: 0.88rem; color: var(--text-2); line-height: 1.65; margin-bottom: 20px; }

.ml-req-form, .ml-upload-form { display: flex; flex-direction: column; gap: 10px; }
.ml-req-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.ml-req-input {
  background: var(--bg-2); border: 1.5px solid var(--border-md); border-radius: var(--r-sm);
  padding: 11px 14px; font-family: var(--font-body); font-size: 0.88rem; color: var(--text);
  outline: none; transition: all var(--dur) var(--ease); width: 100%;
}
.ml-req-input::placeholder { color: var(--text-3); }
.ml-req-input:focus { border-color: var(--blue); }
.ml-req-textarea {
  background: var(--bg-2); border: 1.5px solid var(--border-md); border-radius: var(--r-sm);
  padding: 11px 14px; font-family: var(--font-body); font-size: 0.88rem; color: var(--text);
  outline: none; resize: vertical; transition: all var(--dur) var(--ease);
}
.ml-req-textarea:focus { border-color: var(--blue); }
.ml-req-submit {
  background: var(--blue); color: #fff;
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 700;
  padding: 13px; border-radius: var(--r-sm); transition: all var(--dur) var(--ease);
}
.ml-req-submit:hover { background: var(--blue-d); transform: translateY(-1px); }

.ml-contrib-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.ml-contrib-list li { font-size: 0.88rem; color: var(--text-2); display: flex; align-items: center; gap: 8px; }
.ml-contrib-btn {
  width: 100%; background: var(--green); color: var(--bg);
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 700;
  padding: 13px; border-radius: var(--r-sm); transition: all var(--dur) var(--ease);
}
.ml-contrib-btn:hover { background: #059669; transform: translateY(-1px); }


/* ════════════════════════════════════════════════════════════
   FOOTER
════════════════════════════════════════════════════════════ */
.ml-footer { background: var(--surface); border-top: 1px solid var(--border); }
.ml-footer__inner { max-width: 1400px; margin: 0 auto; padding: 48px clamp(16px,3vw,36px) 40px; display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr; gap: 36px; }
.ml-footer-logo .ml-logo__name { color: rgba(232,240,255,0.5); }
.ml-footer-logo .ml-logo__name b { color: var(--blue); }
.ml-footer__brand p { font-size: 0.85rem; color: var(--text-2); line-height: 1.65; margin-top: 10px; }
.ml-footer__socials { display: flex; gap: 10px; margin-top: 14px; }
.ml-footer__socials a { font-size: 1.2rem; transition: transform var(--dur) var(--ease); display: inline-block; }
.ml-footer__socials a:hover { transform: translateY(-2px) scale(1.1); }
.ml-footer__col { display: flex; flex-direction: column; gap: 0; }
.ml-footer__col h4 { font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-3); margin-bottom: 14px; }
.ml-footer__col a { font-size: 0.85rem; color: var(--text-2); padding: 4px 0; transition: all var(--dur) var(--ease); font-weight: 500; }
.ml-footer__col a:hover { color: var(--blue); padding-left: 4px; }
.ml-footer__bottom { max-width: 1400px; margin: 0 auto; padding: 18px clamp(16px,3vw,36px); border-top: 1px solid var(--border); text-align: center; }
.ml-footer__bottom p { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-3); }
.ml-footer__bottom b { color: var(--amber); }

.ml-footer__cols { display: contents; }


/* ── BTT ── */
.ml-btt {
  position: fixed; bottom: 28px; right: 28px;
  width: 44px; height: 44px; background: var(--surface); border: 1px solid var(--border-md);
  border-radius: 50%; color: var(--text-2); font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  z-index: 900; opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: all var(--dur) var(--ease); cursor: pointer;
}
.ml-btt--show { opacity: 1; pointer-events: all; transform: translateY(0); }
.ml-btt:hover { background: var(--blue); border-color: var(--blue); color: #fff; transform: translateY(-2px); }


/* ════════════════════════════════════════════════════════════
   MODALS
════════════════════════════════════════════════════════════ */
.ml-modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.75);
  z-index: 2000; display: none; align-items: center; justify-content: center; padding: 20px;
}
.ml-modal-overlay--open { display: flex !important; }

.ml-modal {
  background: var(--surface); border: 1px solid var(--border-md); border-radius: var(--r-xl);
  width: 100%; max-width: 780px; max-height: 90vh; overflow-y: auto;
  position: relative; animation: modalReveal 0.3s var(--ease) both;
  box-shadow: 0 20px 80px rgba(0,0,0,0.6);
}
@keyframes modalReveal { from { opacity:0; transform: scale(0.95) translateY(20px); } to { opacity:1; transform: scale(1) translateY(0); } }

.ml-modal--upload { max-width: 600px; padding: 32px; }
.ml-modal__close {
  position: absolute; top: 16px; right: 16px;
  width: 32px; height: 32px; background: var(--surface-2); border: 1px solid var(--border-md);
  border-radius: 50%; color: var(--text-2); font-size: 0.8rem;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--dur) var(--ease); z-index: 1;
}
.ml-modal__close:hover { background: var(--red-dim); color: var(--red); border-color: rgba(239,68,68,0.2); }

.ml-modal__header { padding: 28px 28px 0; border-bottom: 1px solid var(--border); padding-bottom: 20px; margin-bottom: 0; }
.ml-modal__course-code { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; color: var(--green); background: var(--green-dim); border: 1px solid var(--green-bd); padding: 4px 10px; border-radius: 4px; display: inline-block; margin-bottom: 8px; }
.ml-modal__title { font-family: var(--font-display); font-size: clamp(1.1rem,2.5vw,1.5rem); font-weight: 700; color: var(--text); letter-spacing: -0.02em; margin-bottom: 10px; }
.ml-modal__meta { display: flex; gap: 8px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-3); }
.ml-modal__sep { opacity: 0.4; }

.ml-modal__body { padding: 24px 28px; }
.ml-modal__description { font-size: 0.9rem; color: var(--text-2); line-height: 1.7; margin-bottom: 20px; padding: 16px; background: var(--surface-2); border-radius: var(--r); border-left: 3px solid var(--blue); }

/* PDF preview */
.ml-pdf-preview-wrap { width: 100%; border-radius: var(--r); overflow: hidden; border: 1px solid var(--border); margin-bottom: 20px; background: var(--bg-2); }
.ml-pdf-placeholder { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px; gap: 8px; color: var(--text-3); }
.ml-pdf-placeholder span { font-size: 3rem; }
.ml-pdf-note { font-size: 0.78rem; opacity: 0.7; }
.ml-pdf-frame { width: 100%; height: 480px; border: none; display: block; }

/* Modal stats */
.ml-modal__stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; margin-bottom: 20px; }
.ml-modal-stat { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--r); padding: 14px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.ml-modal-stat span { font-size: 1.2rem; }
.ml-modal-stat strong { font-family: var(--font-mono); font-size: 1.1rem; font-weight: 700; color: var(--text); }
.ml-modal-stat small { font-size: 0.68rem; color: var(--text-3); letter-spacing: 0.06em; text-transform: uppercase; }

/* Star rating */
.ml-rating-input { margin-bottom: 20px; }
.ml-rating-input p { font-size: 0.82rem; color: var(--text-2); margin-bottom: 8px; }
.ml-stars { display: flex; gap: 6px; }
.ml-star { font-size: 1.4rem; color: var(--text-3); transition: all var(--dur) var(--ease); background: none; border: none; cursor: pointer; line-height: 1; }
.ml-star:hover, .ml-star--active { color: var(--amber); transform: scale(1.2); }

/* Files list */
.ml-modal__files, .ml-modal__related { margin-bottom: 20px; }
.ml-modal__files h4, .ml-modal__related h4 { font-family: var(--font-display); font-size: 0.88rem; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.ml-files-list { display: flex; flex-direction: column; gap: 8px; }
.ml-file-item { display: flex; align-items: center; gap: 12px; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--r-sm); padding: 12px 14px; transition: all var(--dur) var(--ease); }
.ml-file-item:hover { border-color: var(--blue-bd); }
.ml-file-icon { font-size: 1.3rem; flex-shrink: 0; }
.ml-file-name { flex: 1; font-size: 0.85rem; font-weight: 600; color: var(--text); }
.ml-file-size { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-3); white-space: nowrap; }
.ml-file-dl-btn { background: var(--blue); color: #fff; font-size: 0.75rem; font-weight: 700; padding: 6px 12px; border-radius: 50px; transition: all var(--dur) var(--ease); text-decoration: none; }
.ml-file-dl-btn:hover { background: var(--blue-d); color: #fff; }

/* Related list */
.ml-related-list { display: flex; flex-direction: column; gap: 6px; }
.ml-related-item { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; color: var(--text-2); padding: 8px 0; border-bottom: 1px solid var(--border); cursor: pointer; transition: color var(--dur) var(--ease); }
.ml-related-item:hover { color: var(--blue); }
.ml-related-item:last-child { border-bottom: none; }

/* Modal footer */
.ml-modal__footer { padding: 20px 28px; border-top: 1px solid var(--border); display: flex; gap: 12px; flex-wrap: wrap; }
.ml-modal__download-btn {
  flex: 1; background: var(--blue); color: #fff;
  font-family: var(--font-display); font-size: 0.92rem; font-weight: 700;
  padding: 13px 24px; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center; gap: 8px;
  transition: all var(--dur) var(--ease); min-width: 180px;
}
.ml-modal__download-btn:hover { background: var(--blue-d); color: #fff; transform: translateY(-1px); }
.ml-modal__share-btn {
  background: var(--surface-2); border: 1px solid var(--border-md); color: var(--text-2);
  font-family: var(--font-display); font-size: 0.88rem; font-weight: 700;
  padding: 13px 20px; border-radius: var(--r-sm);
  transition: all var(--dur) var(--ease);
}
.ml-modal__share-btn:hover { border-color: var(--blue-bd); color: var(--blue); }

/* Upload modal */
.ml-modal__upload-title { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; color: var(--text); margin-bottom: 6px; letter-spacing: -0.02em; }
.ml-modal__upload-sub { font-size: 0.85rem; color: var(--text-2); margin-bottom: 22px; }

/* File drop zone */
.ml-file-drop {
  background: var(--bg-2); border: 2px dashed var(--border-md); border-radius: var(--r);
  padding: 28px; text-align: center; color: var(--text-2); font-size: 0.88rem; line-height: 1.7;
  transition: all var(--dur) var(--ease); cursor: pointer;
}
.ml-file-drop:hover, .ml-file-drop--active { border-color: var(--blue); background: var(--blue-dim); }
.ml-file-drop span { display: block; font-size: 2rem; margin-bottom: 6px; }
.ml-file-label { color: var(--blue); font-weight: 700; cursor: pointer; text-decoration: underline; }
.ml-file-drop small { display: block; font-size: 0.72rem; color: var(--text-3); margin-top: 6px; }
.ml-file-name { font-family: var(--font-mono); font-size: 0.75rem; color: var(--green); margin-top: 8px; font-weight: 700; }


/* ════════════════════════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
  .ml-main-layout { grid-template-columns: 240px 1fr; gap: 24px; }
  .ml-footer__inner { grid-template-columns: 1fr 1fr 1fr; }
  .ml-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .ml-main-layout { grid-template-columns: 1fr; }
  .ml-filters { position: static; display: none; }
  .ml-filters--open { display: block !important; }
  .ml-toggle-filter-btn { display: flex !important; }

  .ml-request-grid { grid-template-columns: 1fr; }
  .ml-modal__stats { grid-template-columns: repeat(2,1fr); }
  .ml-footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .ml-nav { display: none; }
  .ml-burger { display: flex; }
  .ml-upload-btn span { display: none; }

  .ml-hero { min-height: auto; padding: 90px 16px 48px; }
  .ml-hero__title { font-size: clamp(2rem,10vw,3rem); }
  .ml-search__input { padding-right: 90px; font-size: 0.85rem; }
  .ml-search__btn { font-size: 0.75rem; padding: 8px 14px; }
  .ml-hero__stats { gap: 12px; }
  .ml-hero-stat__div { height: 28px; }

  .ml-dept-grid { grid-template-columns: repeat(auto-fill, minmax(140px,1fr)); }
  .ml-materials-grid { grid-template-columns: 1fr; }

  .ml-req-row { grid-template-columns: 1fr; }
  .ml-footer__inner { grid-template-columns: 1fr; }

  .ml-modal { max-height: 95vh; }
  .ml-modal__footer { flex-direction: column; }
  .ml-modal__download-btn { min-width: unset; }
}

@media (max-width: 480px) {
  .ml-main-wrap { padding: 0 12px; }
  .ml-level-tabs { gap: 5px; }
  .ml-level-tab { font-size: 0.72rem; padding: 6px 12px; }
  .ml-modal__stats { grid-template-columns: repeat(2,1fr); }
  .ml-request-card, .ml-contribute-card { padding: 24px 18px; }
}