/* ═══════════════════════════════════════════════════════════
   HAZELITH — Claymorphism Design System
   Soft, inflated 3D clay look with pastel gradients
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800;900&display=swap');

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

:root{
  /* Base Palette */
  --bg: #e8eaf6;
  --bg2: #f0f1fa;
  --surface: #f5f6ff;
  --surface2: #eceef9;

  /* Clay Colors */
  --clay-white: #f0f2ff;
  --clay-shadow-out: 8px 8px 20px rgba(166,170,210,.35), -6px -6px 16px rgba(255,255,255,.8);
  --clay-shadow-in: inset 3px 3px 8px rgba(166,170,210,.25), inset -2px -2px 6px rgba(255,255,255,.7);
  --clay-shadow-hover: 4px 4px 12px rgba(166,170,210,.25), -3px -3px 10px rgba(255,255,255,.7);
  --clay-shadow-card: 10px 10px 30px rgba(166,170,210,.3), -8px -8px 24px rgba(255,255,255,.85);
  --clay-shadow-card-hover: 6px 6px 16px rgba(166,170,210,.22), -4px -4px 12px rgba(255,255,255,.7);

  /* Accent Colors */
  --purple: #7c5cfc;
  --purple-soft: #ece8ff;
  --blue: #5b8def;
  --blue-soft: #e4eeff;
  --green: #4ecb8d;
  --green-soft: #e0f8ed;
  --orange: #f7a046;
  --orange-soft: #fff0de;
  --pink: #f06b9e;
  --pink-soft: #ffe4ee;
  --red: #ef5a6f;
  --red-soft: #ffe4e8;
  --cyan: #3cc8d0;
  --cyan-soft: #defbfc;
  --yellow: #f0c940;
  --yellow-soft: #fff8db;

  --gradient: linear-gradient(135deg, #7c5cfc, #5b8def, #4ecb8d);
  --gradient-warm: linear-gradient(135deg, #f06b9e, #f7a046, #f0c940);

  /* Text */
  --text: #2d2b55;
  --text2: #6b6999;
  --text3: #9896c0;

  /* Misc */
  --radius: 24px;
  --radius-sm: 16px;
  --radius-xs: 12px;
  --transition: all .35s cubic-bezier(.4,0,.2,1);
}

html{scroll-behavior:smooth;}
body{font-family:'Nunito',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased;}
::selection{background:rgba(124,92,252,.2);color:var(--text);}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   CLAY COMPONENTS
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

.clay{
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.6);
  transition: var(--transition);
}
.clay:hover{
  box-shadow: var(--clay-shadow-card-hover);
  transform: translateY(-2px);
}

.clay-inset{
  background: var(--surface2);
  border-radius: var(--radius-sm);
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(255,255,255,.4);
}

.clay-flat{
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: 4px 4px 12px rgba(166,170,210,.2), -3px -3px 10px rgba(255,255,255,.6);
  border: 1px solid rgba(255,255,255,.5);
}

/* ━━━ NAV ━━━ */
.clay-nav{
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 14px 32px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(240, 241, 250, .75);
  backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid rgba(255,255,255,.5);
  box-shadow: 0 4px 20px rgba(166,170,210,.15);
  transition: var(--transition);
}
.clay-nav.scrolled{
  padding: 10px 32px;
  box-shadow: 0 6px 24px rgba(166,170,210,.2);
}
.clay-nav .brand{
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
}
.clay-nav .brand-icon{
  width: 40px; height: 40px;
  border-radius: 14px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1rem; color: #fff;
  box-shadow: 3px 3px 10px rgba(124,92,252,.3), -2px -2px 6px rgba(255,255,255,.5);
}
.clay-nav .brand-name{
  font-size: 1.15rem; font-weight: 900; letter-spacing: -.5px;
}
.clay-nav .brand-name span{
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.clay-nav .nav-actions{
  display: flex; align-items: center; gap: 10px;
}
.clay-nav .user-info{
  font-size: .85rem; color: var(--text2);
  display: flex; align-items: center; gap: 8px;
}
.clay-nav .user-info strong{ color: var(--text); font-weight: 700; }

/* ━━━ BADGES ━━━ */
.badge{
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 14px; border-radius: 100px;
  font-size: .72rem; font-weight: 800; letter-spacing: .5px; text-transform: uppercase;
}
.badge-pending{ background: var(--orange-soft); color: var(--orange); }
.badge-admin{ background: var(--purple-soft); color: var(--purple); }
.badge-locked{ background: var(--red-soft); color: var(--red); }
.badge-active{ background: var(--green-soft); color: var(--green); }
.badge-preview{ background: var(--yellow-soft); color: #b8950c; }

/* ━━━ BUTTONS ━━━ */
.clay-btn{
  padding: 10px 22px;
  border-radius: var(--radius-xs);
  font-size: .85rem; font-weight: 700;
  text-decoration: none; border: none;
  cursor: pointer; font-family: inherit;
  display: inline-flex; align-items: center; gap: 6px;
  transition: var(--transition);
  background: var(--surface);
  color: var(--text2);
  box-shadow: 4px 4px 12px rgba(166,170,210,.25), -3px -3px 8px rgba(255,255,255,.7);
  border: 1px solid rgba(255,255,255,.5);
}
.clay-btn:hover{
  box-shadow: 2px 2px 8px rgba(166,170,210,.2), -2px -2px 6px rgba(255,255,255,.6);
  transform: translateY(-1px);
  color: var(--text);
}
.clay-btn:active{
  box-shadow: var(--clay-shadow-in);
  transform: translateY(0);
}

.clay-btn-primary{
  background: var(--gradient);
  color: #fff;
  border: none;
  box-shadow: 4px 4px 14px rgba(124,92,252,.3), -3px -3px 8px rgba(255,255,255,.4);
}
.clay-btn-primary:hover{
  box-shadow: 2px 2px 10px rgba(124,92,252,.25), -2px -2px 6px rgba(255,255,255,.3);
  color: #fff;
  transform: translateY(-2px);
}

.clay-btn-danger{
  color: var(--red);
  background: var(--red-soft);
  border: 1px solid rgba(239,90,111,.15);
}
.clay-btn-danger:hover{
  background: rgba(239,90,111,.15);
  color: var(--red);
}

/* ━━━ HERO ━━━ */
.clay-hero{
  position: relative;
  padding: 140px 40px 80px;
  text-align: center;
  overflow: hidden;
}
.clay-hero::before{
  content: '';
  position: absolute; top: -30%; left: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(124,92,252,.12), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.clay-hero::after{
  content: '';
  position: absolute; bottom: -20%; right: -5%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(78,203,141,.1), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.clay-hero .hero-label{
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 20px;
  background: var(--surface);
  border-radius: 100px;
  font-size: .8rem; color: var(--text2); font-weight: 700;
  box-shadow: var(--clay-shadow-hover);
  margin-bottom: 28px;
  border: 1px solid rgba(255,255,255,.6);
}
.clay-hero .hero-label .pulse{
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:.4;transform:scale(.9);}50%{opacity:1;transform:scale(1.1);}}

.clay-hero h1{
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900; line-height: 1.1; letter-spacing: -1.5px;
  margin-bottom: 20px; color: var(--text);
}
.clay-hero h1 .accent{
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.clay-hero p{
  font-size: 1.08rem; color: var(--text2);
  max-width: 550px; margin: 0 auto 40px; line-height: 1.8; font-weight: 500;
}
.clay-hero .stats{
  display: flex; justify-content: center; gap: 40px; flex-wrap: wrap;
}
.clay-hero .stat{
  text-align: center;
  padding: 16px 24px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  min-width: 100px;
}
.clay-hero .stat-num{
  font-size: 1.6rem; font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.clay-hero .stat-label{
  font-size: .72rem; color: var(--text3); font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px; margin-top: 4px;
}

/* ━━━ SECTION ━━━ */
.clay-section{
  max-width: 1200px; margin: 0 auto;
  padding: 60px 32px;
}
.clay-section .section-head{
  margin-bottom: 40px;
}
.clay-section .section-head h2{
  font-size: 1.5rem; font-weight: 900; margin-bottom: 6px;
}
.clay-section .section-head p{
  color: var(--text2); font-size: .92rem; font-weight: 500;
}
.clay-section .section-head .bar{
  width: 50px; height: 4px; border-radius: 4px;
  background: var(--gradient); margin-top: 14px;
}

/* ━━━ COURSE CARDS GRID ━━━ */
.course-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.course-card{
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  text-decoration: none; color: var(--text);
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.6);
  display: flex; flex-direction: column; gap: 14px;
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.course-card::before{
  content: '';
  position: absolute; top: -50%; right: -30%;
  width: 200px; height: 200px;
  border-radius: 50%;
  opacity: 0;
  transition: opacity .4s;
  pointer-events: none;
}
.course-card:hover{
  transform: translateY(-5px);
  box-shadow: var(--clay-shadow-card-hover);
}
.course-card:hover::before{ opacity: 1; }

.course-card .cc-top{
  display: flex; align-items: center; gap: 14px;
}
.course-card .cc-icon{
  width: 52px; height: 52px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; flex-shrink: 0;
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  transition: var(--transition);
}
.course-card:hover .cc-icon{
  transform: scale(1.08) rotate(-3deg);
}
.course-card .cc-meta .cc-badge{
  font-size: .68rem; color: var(--text3);
  text-transform: uppercase; letter-spacing: 1px; font-weight: 700;
}
.course-card .cc-meta h3{
  font-size: 1.1rem; font-weight: 800; margin-top: 2px;
}
.course-card .cc-desc{
  font-size: .85rem; color: var(--text2); line-height: 1.7; flex-grow: 1; font-weight: 500;
}
.course-card .cc-tags{
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto;
}
.course-card .cc-tag{
  font-size: .7rem; padding: 4px 12px;
  border-radius: 100px;
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  color: var(--text3); font-weight: 600;
}
.course-card .cc-footer{
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 4px;
}
.course-card .cc-go{
  font-size: .85rem; font-weight: 800;
  display: flex; align-items: center; gap: 6px;
  transition: gap .3s;
}
.course-card:hover .cc-go{ gap: 12px; }

/* Locked card */
.course-card.locked{
  opacity: .5; cursor: default;
}
.course-card.locked:hover{
  transform: none;
  box-shadow: var(--clay-shadow-out);
}

/* Icon colors */
.ic-html .cc-icon{ background: linear-gradient(135deg, #ffe0d0, #ffeee5); }
.ic-css .cc-icon{ background: linear-gradient(135deg, #d0e0ff, #e5eeff); }
.ic-js .cc-icon{ background: linear-gradient(135deg, #fff5d0, #fffae5); }
.ic-py .cc-icon{ background: linear-gradient(135deg, #d0f0ff, #e5f6ff); }
.ic-c .cc-icon{ background: linear-gradient(135deg, #e0e0f0, #ededf5); }
.ic-php .cc-icon{ background: linear-gradient(135deg, #e5d8ff, #f0ecff); }
.ic-gd .cc-icon{ background: linear-gradient(135deg, #d5e8ff, #e5f0ff); }
.ic-gml .cc-icon{ background: linear-gradient(135deg, #d0f5e5, #e5faf0); }
.ic-html::before{ background: radial-gradient(circle, rgba(227,79,38,.08), transparent 60%); }
.ic-css::before{ background: radial-gradient(circle, rgba(38,77,228,.08), transparent 60%); }
.ic-js::before{ background: radial-gradient(circle, rgba(247,223,30,.08), transparent 60%); }
.ic-py::before{ background: radial-gradient(circle, rgba(55,118,171,.08), transparent 60%); }
.ic-gml::before{ background: radial-gradient(circle, rgba(78,203,141,.08), transparent 60%); }

/* ━━━ AUTH MODAL ━━━ */
.clay-overlay{
  display: none; position: fixed; inset: 0;
  background: rgba(200,202,230,.5);
  backdrop-filter: blur(12px);
  z-index: 200; align-items: center; justify-content: center;
}
.clay-overlay.show{ display: flex; }
.clay-modal{
  background: var(--surface);
  border-radius: var(--radius);
  padding: 44px; max-width: 420px; width: 90%;
  text-align: center;
  box-shadow: var(--clay-shadow-card);
  border: 1px solid rgba(255,255,255,.6);
  animation: modalIn .35s cubic-bezier(.2,0,0,1);
  position: relative;
}
@keyframes modalIn{from{opacity:0;transform:scale(.92) translateY(20px);}to{opacity:1;transform:scale(1) translateY(0);}}
.clay-modal .modal-emoji{ font-size: 2.8rem; margin-bottom: 16px; display: block; }
.clay-modal h3{ font-size: 1.15rem; font-weight: 800; margin-bottom: 10px; }
.clay-modal p{ font-size: .88rem; color: var(--text2); line-height: 1.7; margin-bottom: 24px; font-weight: 500; }
.clay-modal .modal-actions{ display: flex; gap: 12px; justify-content: center; }
.clay-modal .close-x{
  position: absolute; top: 14px; right: 14px;
  width: 32px; height: 32px; border-radius: 10px;
  background: var(--surface2); border: 1px solid rgba(255,255,255,.4);
  box-shadow: 2px 2px 6px rgba(166,170,210,.15), -1px -1px 4px rgba(255,255,255,.5);
  color: var(--text3); cursor: pointer; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.clay-modal .close-x:hover{ color: var(--text); background: var(--surface); }

/* ━━━ FOOTER ━━━ */
.clay-footer{
  padding: 32px; text-align: center;
  color: var(--text3); font-size: .82rem; font-weight: 600;
  border-top: 1px solid rgba(255,255,255,.4);
}
.clay-footer a{
  text-decoration: none; color: var(--text2); font-weight: 700;
  transition: color .2s;
}
.clay-footer a:hover{ color: var(--purple); }
.clay-footer .credit-brand{
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  font-weight: 900;
}

/* ━━━ MESSAGING WIDGET ━━━ */
.msg-fab{
  position: fixed; bottom: 28px; right: 28px; z-index: 150;
  width: 56px; height: 56px;
  border-radius: 18px;
  background: var(--gradient);
  border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: #fff;
  box-shadow: 6px 6px 20px rgba(124,92,252,.35), -3px -3px 10px rgba(255,255,255,.3);
  transition: var(--transition);
}
.msg-fab:hover{
  transform: translateY(-3px) scale(1.05);
  box-shadow: 4px 4px 16px rgba(124,92,252,.4), -2px -2px 8px rgba(255,255,255,.3);
}
.msg-fab .fab-badge{
  position: absolute; top: -4px; right: -4px;
  min-width: 20px; height: 20px; border-radius: 10px;
  background: var(--red); color: #fff;
  font-size: .68rem; font-weight: 800;
  display: none; align-items: center; justify-content: center;
  padding: 0 5px; border: 2px solid var(--bg);
}
.msg-fab .fab-badge.show{ display: flex; }

.msg-panel{
  position: fixed; bottom: 96px; right: 28px; z-index: 150;
  width: 380px; max-height: 520px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--clay-shadow-card);
  border: 1px solid rgba(255,255,255,.6);
  display: none; flex-direction: column; overflow: hidden;
  animation: panelSlide .3s cubic-bezier(.2,0,0,1);
}
.msg-panel.show{ display: flex; }
@keyframes panelSlide{from{opacity:0;transform:translateY(20px) scale(.95);}to{opacity:1;transform:translateY(0) scale(1);}}

.msg-panel .mp-head{
  padding: 18px 22px;
  border-bottom: 1px solid rgba(166,170,210,.12);
  display: flex; align-items: center; justify-content: space-between;
}
.msg-panel .mp-head h3{
  font-size: .95rem; font-weight: 800;
  display: flex; align-items: center; gap: 8px;
}
.msg-panel .mp-close{
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--surface2); border: 1px solid rgba(255,255,255,.4);
  box-shadow: 2px 2px 6px rgba(166,170,210,.12), -1px -1px 4px rgba(255,255,255,.4);
  color: var(--text3); cursor: pointer; font-size: .9rem;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.msg-panel .mp-close:hover{ color: var(--text); }

.msg-panel .mp-body{
  flex: 1; overflow-y: auto; padding: 18px 22px;
  display: flex; flex-direction: column; gap: 10px;
  min-height: 180px; max-height: 320px;
}
.msg-panel .mp-body::-webkit-scrollbar{ width: 4px; }
.msg-panel .mp-body::-webkit-scrollbar-track{ background: transparent; }
.msg-panel .mp-body::-webkit-scrollbar-thumb{ background: rgba(166,170,210,.2); border-radius: 4px; }

.mp-empty{
  text-align: center; color: var(--text3);
  font-size: .85rem; padding: 40px 0; font-weight: 600;
}
.mp-msg{
  max-width: 82%; padding: 10px 16px;
  border-radius: 16px; font-size: .86rem;
  line-height: 1.6; word-break: break-word; font-weight: 500;
}
.mp-msg.sent{
  align-self: flex-end;
  background: var(--purple-soft);
  color: var(--text);
  border-bottom-right-radius: 4px;
  box-shadow: 2px 2px 8px rgba(124,92,252,.1);
}
.mp-msg.recv{
  align-self: flex-start;
  background: var(--surface2);
  color: var(--text);
  border-bottom-left-radius: 4px;
  box-shadow: var(--clay-shadow-in);
}
.mp-msg .mt{
  font-size: .68rem; color: var(--text3);
  margin-top: 4px; display: block; font-weight: 600;
}
.mp-msg.sent .mt{ text-align: right; }

.msg-panel .mp-foot{
  padding: 14px 22px;
  border-top: 1px solid rgba(166,170,210,.12);
  display: flex; gap: 10px;
}
.msg-panel .mp-foot input{
  flex: 1; padding: 10px 16px;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(255,255,255,.4);
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  color: var(--text); font-size: .86rem;
  outline: none; font-family: inherit; font-weight: 500;
  transition: var(--transition);
}
.msg-panel .mp-foot input:focus{
  box-shadow: var(--clay-shadow-in), 0 0 0 3px rgba(124,92,252,.1);
}
.msg-panel .mp-foot input::placeholder{ color: var(--text3); }
.msg-panel .mp-foot button{
  padding: 10px 18px; border-radius: var(--radius-xs);
  border: none; background: var(--gradient);
  color: #fff; font-weight: 800; font-size: .82rem;
  cursor: pointer; font-family: inherit;
  box-shadow: 3px 3px 10px rgba(124,92,252,.2);
  transition: var(--transition); white-space: nowrap;
}
.msg-panel .mp-foot button:hover{
  box-shadow: 2px 2px 8px rgba(124,92,252,.3);
  transform: translateY(-1px);
}

.mp-no-perm{
  padding: 16px 22px;
  border-top: 1px solid rgba(166,170,210,.12);
  text-align: center;
}
.mp-no-perm p{
  font-size: .8rem; color: var(--text3); margin-bottom: 10px;
  line-height: 1.5; font-weight: 600;
}
.mp-nudge{
  padding: 10px 24px; border-radius: var(--radius-xs);
  background: var(--orange-soft);
  border: 1px solid rgba(247,160,70,.2);
  color: var(--orange); font-weight: 800; font-size: .84rem;
  cursor: pointer; font-family: inherit;
  transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
  box-shadow: 3px 3px 10px rgba(247,160,70,.12);
}
.mp-nudge:hover{
  box-shadow: 2px 2px 8px rgba(247,160,70,.2);
  transform: translateY(-1px);
}
.mp-nudge:disabled{ opacity: .5; cursor: not-allowed; }
.mp-nudge .nudge-icon{
  animation: nudgeShake 1.5s ease-in-out infinite; display: inline-block;
}
@keyframes nudgeShake{0%,100%{transform:rotate(0);}15%{transform:rotate(15deg);}30%{transform:rotate(-10deg);}45%{transform:rotate(8deg);}60%{transform:rotate(0);}}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   COURSE INDEX PAGES
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.course-index-hero{
  padding: 80px 40px 50px;
  text-align: center;
  position: relative; overflow: hidden;
}
.course-index-hero .ci-badge{
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 18px;
  background: var(--surface);
  border-radius: 100px;
  font-size: .75rem; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase;
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  margin-bottom: 20px;
}
.course-index-hero h1{
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900; margin-bottom: 14px;
}
.course-index-hero p{
  font-size: 1.05rem; color: var(--text2);
  max-width: 580px; margin: 0 auto 28px; line-height: 1.8; font-weight: 500;
}
.course-index-hero .ci-stats{
  display: flex; justify-content: center; gap: 28px; flex-wrap: wrap;
}
.course-index-hero .ci-stat{
  padding: 12px 20px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  font-size: .85rem; color: var(--text2); font-weight: 600;
}
.course-index-hero .ci-stat b{
  display: block; font-size: 1.3rem; color: var(--text);
  font-weight: 900; margin-bottom: 2px;
}

.lesson-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 0 40px 60px;
  max-width: 1200px; margin: 0 auto;
}
.lesson-card{
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none; color: var(--text);
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.6);
  display: flex; flex-direction: column; gap: 12px;
  transition: var(--transition);
}
.lesson-card:hover{
  transform: translateY(-4px);
  box-shadow: var(--clay-shadow-card-hover);
}
.lesson-card .lc-head{
  display: flex; align-items: center; gap: 12px;
}
.lesson-card .lc-icon,
.lesson-card .ikon{
  width: 44px; height: 44px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; flex-shrink: 0;
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.4);
}
.lesson-card .lc-meta .lc-num{
  font-size: .68rem; color: var(--text3);
  text-transform: uppercase; letter-spacing: .5px; font-weight: 700;
}
.lesson-card .lc-meta h3{
  font-size: .95rem; font-weight: 800; margin-top: 1px;
}
.lesson-card .lc-desc{
  font-size: .82rem; color: var(--text2); line-height: 1.65; font-weight: 500;
}
.lesson-card .lc-tags{
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto;
}
.lesson-card .lc-tag{
  font-size: .68rem; padding: 3px 10px;
  border-radius: 100px;
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  color: var(--text3); font-weight: 600;
}
.lesson-card .lc-go{
  font-size: .82rem; font-weight: 800;
  color: var(--purple);
  display: flex; align-items: center; gap: 5px;
  transition: gap .3s;
}
.lesson-card:hover .lc-go{ gap: 10px; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   LESSON PAGES – NEW TOPBAR + DRAWER LAYOUT
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

/* Progress Bar */
.lesson-progress{
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: 3px; background: var(--surface2);
}
.lesson-progress .bar{
  height: 100%; width: 0;
  background: var(--gradient);
  border-radius: 0 2px 2px 0;
  transition: width .15s linear;
}

/* Top Bar */
.lesson-topbar{
  position: sticky; top: 0; z-index: 150;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 24px;
  background: rgba(240,241,250,.82);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(255,255,255,.5);
  box-shadow: 0 4px 18px rgba(166,170,210,.1);
}
.ltb-back{
  display: flex; align-items: center; gap: 6px;
  color: var(--purple); text-decoration: none;
  font-size: .82rem; font-weight: 800;
  padding: 6px 14px;
  background: var(--purple-soft);
  border-radius: var(--radius-xs);
  box-shadow: 2px 2px 6px rgba(124,92,252,.06), -1px -1px 4px rgba(255,255,255,.5);
  transition: var(--transition);
  white-space: nowrap;
}
.ltb-back:hover{ transform: translateY(-1px); gap: 10px; }
.ltb-info{
  flex: 1; min-width: 0; display: flex; align-items: center; gap: 10px;
}
.ltb-badge{
  font-size: .62rem; font-weight: 900; text-transform: uppercase;
  letter-spacing: .8px; color: #fff;
  padding: 3px 10px; border-radius: 100px;
  background: var(--gradient);
  white-space: nowrap; flex-shrink: 0;
}
.ltb-title{
  font-size: .88rem; font-weight: 800;
  color: var(--text); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.ltb-menu{
  width: 40px; height: 40px;
  border-radius: var(--radius-xs);
  background: var(--surface);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--transition);
  font-size: 1.1rem; color: var(--text2); flex-shrink: 0;
}
.ltb-menu:hover{ box-shadow: var(--clay-shadow-card-hover); color: var(--purple); }

/* Drawer */
.lesson-drawer-overlay{
  position: fixed; inset: 0; z-index: 300;
  background: rgba(45,43,85,.25);
  backdrop-filter: blur(6px);
  opacity: 0; visibility: hidden;
  transition: opacity .3s, visibility .3s;
}
.lesson-drawer-overlay.open{ opacity: 1; visibility: visible; }

.lesson-drawer{
  position: fixed; top: 0; right: -340px; bottom: 0; z-index: 310;
  width: 320px; max-width: 85vw;
  background: var(--surface);
  box-shadow: -10px 0 40px rgba(166,170,210,.2);
  border-left: 1px solid rgba(255,255,255,.5);
  overflow-y: auto;
  transition: right .35s cubic-bezier(.4,0,.2,1);
  padding: 0;
}
.lesson-drawer.open{ right: 0; }
.lesson-drawer::-webkit-scrollbar{ width: 4px; }
.lesson-drawer::-webkit-scrollbar-thumb{ background: rgba(166,170,210,.2); border-radius: 4px; }

.ld-head{
  padding: 20px 24px;
  border-bottom: 1px solid rgba(166,170,210,.1);
  display: flex; align-items: center; justify-content: space-between;
}
.ld-head h3{ font-size: 1rem; font-weight: 900; }
.ld-close{
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: var(--text3);
  transition: var(--transition);
}
.ld-close:hover{ color: var(--red); }

.ld-nav{ padding: 12px 0; }
.ld-nav a{
  display: flex; align-items: center; gap: 12px;
  padding: 11px 24px; margin: 2px 0;
  color: var(--text2); text-decoration: none;
  font-size: .86rem; font-weight: 600;
  transition: var(--transition);
  border-right: 3px solid transparent;
}
.ld-nav a:hover{
  background: rgba(124,92,252,.04);
  color: var(--text);
}
.ld-nav a.active{
  background: rgba(124,92,252,.07);
  color: var(--purple);
  border-right-color: var(--purple);
  font-weight: 800;
}
.ld-nav a .num{
  width: 28px; height: 28px;
  border-radius: 10px;
  background: var(--surface2);
  box-shadow: 2px 2px 6px rgba(166,170,210,.1), -1px -1px 4px rgba(255,255,255,.5);
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem; font-weight: 900; flex-shrink: 0;
}
.ld-nav a.active .num{
  background: var(--purple); color: #fff;
  box-shadow: 2px 2px 8px rgba(124,92,252,.2);
}
.ld-home{
  display: flex; align-items: center; gap: 8px;
  margin: 12px 16px 20px;
  padding: 11px 18px;
  background: var(--surface);
  border-radius: var(--radius-xs);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  color: var(--purple); text-decoration: none;
  font-size: .84rem; font-weight: 800;
  transition: var(--transition);
}
.ld-home:hover{
  transform: translateY(-1px);
  box-shadow: var(--clay-shadow-card-hover);
}

/* Hero */
.lesson-hero{
  max-width: 960px; margin: 0 auto;
  padding: 48px 40px 0;
  text-align: center;
}
.lh-tags{
  display: flex; gap: 6px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 14px;
}
.lh-tag{
  font-size: .68rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .5px; padding: 4px 12px; border-radius: 100px;
  background: var(--surface);
  box-shadow: 2px 2px 6px rgba(166,170,210,.12), -1px -1px 4px rgba(255,255,255,.5);
  border: 1px solid rgba(255,255,255,.5);
  color: var(--text3);
}
.lesson-hero h1{
  font-size: 2.2rem; font-weight: 900;
  line-height: 1.2; margin-bottom: 12px;
  letter-spacing: -.5px;
}
.lesson-hero .lh-desc{
  color: var(--text2); font-size: .95rem;
  line-height: 1.8; font-weight: 500;
  max-width: 780px; margin: 0 auto 24px;
}
.lh-meta{
  display: flex; gap: 20px; justify-content: center;
  padding-top: 16px;
  border-top: 1px solid rgba(166,170,210,.1);
}
.lh-meta-item{
  font-size: .78rem; color: var(--text3); font-weight: 700;
  display: flex; align-items: center; gap: 5px;
}
.lh-meta-item b{ color: var(--purple); }

/* Main Content */
.lesson-body{
  max-width: 960px; margin: 0 auto;
  padding: 36px 40px 40px;
}

/* Floating TOC (desktop only) */
.lesson-toc{
  position: fixed; top: 80px; right: 24px;
  width: 220px; max-height: calc(100vh - 120px);
  overflow-y: auto;
  background: var(--surface);
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.6);
  border-radius: var(--radius-sm);
  padding: 16px; z-index: 50;
  display: none; /* shown by JS on wide screens */
}
.lesson-toc h4{
  font-size: .7rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: .8px;
  color: var(--text3); margin-bottom: 10px;
}
.lesson-toc a{
  display: block; padding: 5px 0;
  font-size: .78rem; font-weight: 600;
  color: var(--text2); text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px; margin: 1px 0;
  transition: var(--transition);
}
.lesson-toc a:hover{ color: var(--text); border-left-color: rgba(166,170,210,.3); }
.lesson-toc a.active{
  color: var(--purple); border-left-color: var(--purple);
  font-weight: 800;
}
.lesson-toc::-webkit-scrollbar{ width: 3px; }
.lesson-toc::-webkit-scrollbar-thumb{ background: rgba(166,170,210,.15); border-radius: 3px; }

/* Content Cards */
.lesson-body .card{
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px 36px 32px 40px;
  margin-bottom: 24px;
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.6);
  border-left: 4px solid var(--purple);
  position: relative;
}
.lesson-body .card:nth-child(even){
  border-left-color: var(--blue);
}
.lesson-body .card:nth-child(3n){
  border-left-color: var(--green);
}
.lesson-body .card h2{
  font-size: 1.12rem; font-weight: 900;
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
  scroll-margin-top: 72px;
}
.lesson-body .card p,
.lesson-body .card li{
  font-size: .9rem; color: var(--text2);
  line-height: 1.8; font-weight: 500;
}
.lesson-body .card ul{ padding-left: 18px; }
.lesson-body .card ul li{ margin: 4px 0; }
.lesson-body .card strong{ color: var(--text); font-weight: 700; }

/* Sticky Bottom Nav */
.lesson-bottom-nav{
  position: sticky; bottom: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 28px;
  background: rgba(240,241,250,.85);
  backdrop-filter: blur(16px) saturate(1.3);
  border-top: 1px solid rgba(255,255,255,.5);
  box-shadow: 0 -4px 18px rgba(166,170,210,.08);
  max-width: none; margin: 0;
}
.lbn-btn{
  padding: 10px 22px;
  border-radius: var(--radius-xs);
  font-size: .84rem; font-weight: 800;
  text-decoration: none;
  background: var(--surface);
  color: var(--text2);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  transition: var(--transition);
  display: flex; align-items: center; gap: 6px;
}
.lbn-btn:hover{
  color: var(--purple); transform: translateY(-1px);
}
.lbn-btn.next{
  background: var(--gradient); color: #fff; border: none;
  box-shadow: 3px 3px 12px rgba(124,92,252,.2);
}
.lbn-btn.next:hover{
  box-shadow: 2px 2px 8px rgba(124,92,252,.25); color: #fff;
}
.lbn-center{
  font-size: .72rem; font-weight: 800;
  color: var(--text3); text-transform: uppercase; letter-spacing: .5px;
}

/* Lesson Footer */
.lesson-foot{
  max-width: 960px; margin: 0 auto;
  border-top: 1px solid rgba(166,170,210,.08);
  padding: 20px 32px; text-align: center;
  font-size: .8rem; color: var(--text3); font-weight: 600;
}
.lesson-foot a{ color: var(--purple); text-decoration: none; font-weight: 800; }

/* Code Block */
.code-block{
  background: #2d2b55;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 16px 0;
  font-family: 'Cascadia Code','Fira Code','Consolas',monospace;
  box-shadow: 6px 6px 18px rgba(45,43,85,.25), -3px -3px 10px rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.08);
}
.code-block .cb-header{
  background: rgba(255,255,255,.06);
  padding: 8px 16px;
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.code-block .cb-header .lang{
  font-size: .72rem; color: #a78bfa;
  font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
}
.code-block pre{
  padding: 20px; overflow-x: auto;
  line-height: 1.8; font-size: .88rem;
  color: #e4e2ff;
}

/* Syntax Colors */
.kw{ color: #ff6b8a; }
.fn{ color: #c4a7ff; }
.str{ color: #a5e8ff; }
.num{ color: #7dd3fc; }
.cm{ color: #8886b0; font-style: italic; }
.tp{ color: #ffb070; }
.op{ color: #ff6b8a; }
.bi{ color: #ff9e64; }
.cn{ color: #e4e2ff; }
.pr{ color: #7ee787; }
.tag{ color: #7ee787; }
.attr{ color: #7dd3fc; }
.val{ color: #a5e8ff; }

/* Tables */
.exp-table{
  width: 100%; border-collapse: collapse;
  margin-top: 14px; font-size: .87rem;
}
.exp-table th{
  background: var(--surface2);
  color: var(--text2); padding: 10px 14px;
  text-align: left; font-weight: 700;
  border-bottom: 2px solid rgba(166,170,210,.15);
}
.exp-table td{
  padding: 10px 14px;
  border-bottom: 1px solid rgba(166,170,210,.08);
  vertical-align: top; font-weight: 500;
}
.exp-table tr:hover td{
  background: rgba(124,92,252,.03);
}
.exp-table td:first-child{
  font-family: 'Cascadia Code', monospace;
  color: var(--purple); white-space: nowrap;
}

/* Info & Warn boxes */
.info-box{
  display: flex; gap: 12px;
  background: var(--blue-soft);
  border-radius: var(--radius-sm);
  padding: 14px 18px; margin: 14px 0;
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(91,141,239,.12);
}
.info-box .ico{ font-size: 1.1rem; flex-shrink: 0; }
.info-box p{
  font-size: .87rem; color: var(--text2);
  line-height: 1.65; font-weight: 500;
}

.warn-box{
  display: flex; gap: 12px;
  background: var(--orange-soft);
  border-radius: var(--radius-sm);
  padding: 14px 18px; margin: 14px 0;
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(247,160,70,.12);
}
.warn-box .ico{ font-size: 1.1rem; flex-shrink: 0; }
.warn-box p{
  font-size: .87rem; color: var(--text2);
  line-height: 1.65; font-weight: 500;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   AUTH PAGES
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.auth-page{
  min-height: 100vh; display: flex;
  align-items: center; justify-content: center;
  padding: 20px; position: relative; overflow: hidden;
}
.auth-page::before{
  content: '';
  position: absolute; top: -20%; left: -15%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(124,92,252,.1), transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.auth-page::after{
  content: '';
  position: absolute; bottom: -15%; right: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(78,203,141,.08), transparent 70%);
  border-radius: 50%; pointer-events: none;
}

.auth-box{ position: relative; z-index: 1; width: 100%; max-width: 440px; }
.auth-box.wide{ max-width: 580px; }

.auth-brand-block{
  text-align: center; margin-bottom: 28px;
}
.auth-brand-block .icon{
  width: 52px; height: 52px; border-radius: 16px;
  background: var(--gradient);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1.3rem; color: #fff;
  margin-bottom: 14px;
  box-shadow: 4px 4px 14px rgba(124,92,252,.3), -2px -2px 8px rgba(255,255,255,.3);
}
.auth-brand-block h1{
  font-size: 1.4rem; font-weight: 900;
}
.auth-brand-block h1 span{
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.auth-brand-block p{
  color: var(--text3); font-size: .85rem; margin-top: 6px; font-weight: 600;
}

.auth-form-card{
  background: var(--surface);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--clay-shadow-card);
  border: 1px solid rgba(255,255,255,.6);
  position: relative; overflow: hidden;
}
.auth-form-card h2{
  font-size: 1.08rem; font-weight: 800;
  margin-bottom: 26px; text-align: center; color: var(--text2);
}

.field{margin-bottom:20px;}
.field label{
  display: block; font-size: .78rem; color: var(--text3);
  margin-bottom: 8px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .5px;
}
.field input[type="text"],
.field input[type="email"],
.field input[type="password"]{
  width: 100%; padding: 12px 16px;
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: var(--radius-xs);
  color: var(--text); font-size: .9rem;
  transition: var(--transition);
  outline: none; font-family: inherit; font-weight: 600;
}
.field input:focus{
  box-shadow: var(--clay-shadow-in), 0 0 0 3px rgba(124,92,252,.1);
}
.field input::placeholder{ color: var(--text3); opacity: .7; }

.btn-submit{
  width: 100%; padding: 14px;
  background: var(--gradient);
  border: none; border-radius: var(--radius-xs);
  color: #fff; font-size: .92rem; font-weight: 800;
  cursor: pointer; transition: var(--transition);
  margin-top: 8px; font-family: inherit;
  box-shadow: 4px 4px 16px rgba(124,92,252,.25);
}
.btn-submit:hover{
  transform: translateY(-2px);
  box-shadow: 3px 3px 12px rgba(124,92,252,.3);
}
.btn-submit:active{ transform: translateY(0); }

.msg-error{
  background: var(--red-soft);
  border: 1px solid rgba(239,90,111,.15);
  color: var(--red); padding: 12px 16px;
  border-radius: var(--radius-xs);
  font-size: .85rem; font-weight: 700;
  margin-bottom: 20px; text-align: center;
  animation: shake .4s ease;
}
.msg-success{
  background: var(--green-soft);
  border: 1px solid rgba(78,203,141,.15);
  color: var(--green); padding: 12px 16px;
  border-radius: var(--radius-xs);
  font-size: .85rem; font-weight: 700;
  margin-bottom: 20px; text-align: center;
}
@keyframes shake{0%,100%{transform:translateX(0);}20%,60%{transform:translateX(-6px);}40%,80%{transform:translateX(6px);}}

.auth-links{
  text-align: center; margin-top: 22px;
  font-size: .85rem; color: var(--text3); font-weight: 600;
}
.auth-links a{
  color: var(--purple); text-decoration: none; font-weight: 800;
  transition: color .2s;
}
.auth-links a:hover{ color: #5b3de0; }

/* Register: Course Selection */
.ders-section{ margin-bottom: 24px; }
.ders-top{
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px; flex-wrap: wrap; gap: 8px;
}
.ders-top label{
  font-size: .78rem; color: var(--text3); font-weight: 700;
  text-transform: uppercase; letter-spacing: .5px;
}
.price-tag{
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .75rem; color: var(--orange);
  background: var(--orange-soft);
  border: 1px solid rgba(247,160,70,.15);
  padding: 4px 14px; border-radius: 100px; font-weight: 800;
  box-shadow: 2px 2px 6px rgba(247,160,70,.08);
}
.select-all-btn{
  padding: 6px 16px; border-radius: var(--radius-xs);
  font-size: .72rem; font-weight: 800; cursor: pointer;
  border: none;
  background: var(--purple-soft); color: var(--purple);
  box-shadow: 2px 2px 8px rgba(124,92,252,.1), -1px -1px 4px rgba(255,255,255,.5);
  transition: var(--transition); font-family: inherit;
}
.select-all-btn:hover{
  box-shadow: 1px 1px 6px rgba(124,92,252,.15);
  transform: translateY(-1px);
}

.ders-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.ders-item{
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: var(--radius-xs);
  cursor: pointer; transition: var(--transition);
  user-select: none; position: relative;
}
.ders-item:hover{
  background: rgba(124,92,252,.04);
}
.ders-item.selected{
  background: var(--green-soft);
  border-color: rgba(78,203,141,.2);
  box-shadow: inset 2px 2px 6px rgba(78,203,141,.08), inset -1px -1px 4px rgba(255,255,255,.5);
}
.ders-item input[type="checkbox"]{ display: none; }
.ders-item .check-box{
  width: 22px; height: 22px; border-radius: 8px;
  background: var(--surface);
  box-shadow: 2px 2px 6px rgba(166,170,210,.15), -1px -1px 4px rgba(255,255,255,.5);
  border: 1px solid rgba(255,255,255,.4);
  display: flex; align-items: center; justify-content: center;
  font-size: .65rem; transition: var(--transition);
  flex-shrink: 0; color: transparent;
}
.ders-item.selected .check-box{
  background: var(--green); color: #fff;
  box-shadow: 2px 2px 6px rgba(78,203,141,.2);
  border-color: var(--green);
}
.ders-item .d-icon{ font-size: 1.2rem; flex-shrink: 0; }
.ders-item .d-info{ display: flex; flex-direction: column; gap: 1px; }
.ders-item .d-name{ font-size: .88rem; font-weight: 800; }
.ders-item .d-desc{ font-size: .7rem; color: var(--text3); font-weight: 600; }

.price-summary{
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: var(--radius-xs);
  padding: 16px 20px; margin-bottom: 24px;
  display: flex; justify-content: space-between; align-items: center;
}
.price-summary .count{
  font-size: .85rem; color: var(--text2); font-weight: 600;
}
.price-summary .count strong{
  color: var(--text); font-weight: 800;
}
.price-summary .total{
  font-size: 1.15rem; font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.payment-info{
  background: var(--surface2);
  box-shadow: var(--clay-shadow-in);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: var(--radius-xs);
  padding: 20px; margin-bottom: 24px;
}
.payment-info .pay-title{
  font-size: .82rem; font-weight: 800; color: var(--text);
  margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
}
.payment-info .pay-title span{ color: var(--orange); }
.iban-row{
  display: flex; align-items: center; gap: 10px;
  background: var(--surface);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  border-radius: var(--radius-xs);
  padding: 12px 16px; margin-bottom: 12px;
}
.iban-row code{
  font-family: 'Nunito', monospace;
  font-size: .88rem; font-weight: 800;
  color: var(--text); letter-spacing: .5px; flex: 1; user-select: all;
}
.iban-copy{
  padding: 6px 14px; border-radius: 8px;
  border: none;
  background: var(--green-soft); color: var(--green);
  font-size: .72rem; font-weight: 800;
  cursor: pointer; transition: var(--transition);
  font-family: inherit; white-space: nowrap;
  box-shadow: 2px 2px 6px rgba(78,203,141,.08);
}
.iban-copy:hover{
  background: rgba(78,203,141,.15);
  transform: translateY(-1px);
}
.iban-copy.copied{
  background: var(--green); color: #fff;
}
.pay-name{
  font-size: .84rem; color: var(--text2);
  margin-bottom: 8px; font-weight: 600;
}
.pay-name strong{ color: var(--text); font-weight: 800; }
.pay-warn{
  font-size: .76rem; color: var(--orange);
  background: var(--orange-soft);
  border: 1px solid rgba(247,160,70,.12);
  border-radius: 8px; padding: 10px 14px;
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; margin-top: 4px;
}

/* ━━━ RESPONSIVE ━━━ */

/* Wide screens: show floating TOC */
@media(min-width:1340px){
  .lesson-toc{ display: block; }
}

@media(max-width:768px){
  .clay-nav{ padding: 12px 16px; }
  .clay-hero{ padding: 120px 20px 60px; }
  .clay-section{ padding: 40px 16px; }
  .course-grid{ grid-template-columns: 1fr; }
  .lesson-grid{ grid-template-columns: 1fr; padding: 0 20px 40px; }
  .course-index-hero{ padding: 50px 20px 30px; }
  .course-index-hero h1{ font-size: 1.8rem; }

  /* Lesson pages mobile */
  .lesson-topbar{ padding: 10px 16px; }
  .ltb-back span{ display: none; }
  .lesson-hero{ padding: 32px 18px 0; }
  .lesson-hero h1{ font-size: 1.5rem; }
  .lesson-body{ padding: 24px 18px 32px; }
  .lesson-body .card{ padding: 20px 18px 20px 22px; }
  .lesson-bottom-nav{ padding: 10px 14px; }
  .lbn-btn{ padding: 8px 14px; font-size: .8rem; }
  .lbn-center{ display: none; }
}
@media(max-width:500px){
  .clay-nav .user-info{ display: none; }
  .clay-hero .stats{ gap: 12px; }
  .ders-grid{ grid-template-columns: 1fr; }
  .auth-form-card{ padding: 28px; }
  .msg-panel{ right: 12px; left: 12px; width: auto; bottom: 86px; }
  .msg-fab{ bottom: 20px; right: 20px; }
  .lesson-hero .lh-desc{ font-size: .87rem; }
  .lh-meta{ flex-wrap: wrap; gap: 12px; }
}

/* Back link */
.back-link{
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--purple); text-decoration: none;
  font-size: .85rem; font-weight: 700;
  padding: 16px 40px 0;
  transition: gap .2s;
}
.back-link:hover{ gap: 12px; }

/* Course index footer */
.ci-footer{
  border-top: 1px solid rgba(166,170,210,.1);
  padding: 28px 40px; text-align: center;
  color: var(--text3); font-size: .82rem; font-weight: 600;
}
.ci-footer a{
  color: var(--purple); text-decoration: none; font-weight: 900;
}

/* ━━━ GATE / BLOCK PAGE ━━━ */
.gate-page{
  min-height: 100vh; display: flex;
  align-items: center; justify-content: center;
  padding: 24px; position: relative;
}
.gate-container{
  max-width: 520px; width: 100%;
  text-align: center;
  animation: fadeUp .5s ease;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px);}to{opacity:1;transform:translateY(0);}}

.gate-icon{
  width: 80px; height: 80px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.2rem; margin: 0 auto 24px;
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.5);
}
.gate-icon.warn{ background: var(--orange-soft); }
.gate-icon.err{ background: var(--red-soft); }

.gate-container h1{
  font-size: 1.45rem; font-weight: 900;
  margin-bottom: 10px;
}
.gate-container h1.t-warn{ color: var(--orange); }
.gate-container h1.t-err{ color: var(--red); }

.gate-container .desc{
  color: var(--text2); font-size: .92rem;
  line-height: 1.7; margin-bottom: 28px; font-weight: 500;
}
.gate-container .desc strong{ color: var(--text); font-weight: 800; }

.gate-info{
  background: var(--surface);
  box-shadow: var(--clay-shadow-out);
  border: 1px solid rgba(255,255,255,.6);
  border-radius: var(--radius);
  padding: 24px; margin-bottom: 28px; text-align: left;
}
.gate-info h3{
  font-size: .88rem; margin-bottom: 14px;
  color: var(--text); font-weight: 800;
}
.gate-info ul{ list-style: none; }
.gate-info ul li{
  padding: 8px 0;
  border-bottom: 1px solid rgba(166,170,210,.08);
  display: flex; align-items: center; gap: 10px;
  font-size: .86rem; color: var(--text2); font-weight: 600;
}
.gate-info ul li:last-child{ border-bottom: none; }
.gate-info ul li .ck{
  width: 22px; height: 22px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: .6rem; font-weight: 900; flex-shrink: 0;
  box-shadow: 2px 2px 6px rgba(166,170,210,.1), -1px -1px 4px rgba(255,255,255,.5);
}
.gate-info ul li .ck.ok{
  background: var(--green-soft); color: var(--green);
  border: 1px solid rgba(78,203,141,.15);
}
.gate-info ul li .ck.no{
  background: var(--red-soft); color: var(--red);
  border: 1px solid rgba(239,90,111,.15);
}
.gate-info ul li strong{ color: var(--text); font-weight: 800; }

.gate-btns{
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
}
.gate-btn{
  padding: 12px 26px; border-radius: var(--radius-xs);
  font-size: .86rem; font-weight: 800;
  text-decoration: none; transition: var(--transition);
  font-family: 'Nunito', sans-serif;
}
.gate-btn-primary{
  background: var(--gradient); color: #fff;
  box-shadow: 4px 4px 14px rgba(124,92,252,.25);
}
.gate-btn-primary:hover{
  transform: translateY(-2px);
  box-shadow: 3px 3px 10px rgba(124,92,252,.3);
}
.gate-btn-ghost{
  background: var(--surface);
  box-shadow: var(--clay-shadow-hover);
  border: 1px solid rgba(255,255,255,.5);
  color: var(--text2);
}
.gate-btn-ghost:hover{
  color: var(--purple); transform: translateY(-1px);
}
.gate-btn-warn{
  background: var(--orange-soft);
  border: 1px solid rgba(247,160,70,.15);
  color: var(--orange);
  box-shadow: 2px 2px 8px rgba(247,160,70,.1);
}
.gate-btn-warn:hover{
  transform: translateY(-1px);
}

/* 404 page */
.page-404{
  min-height: 100vh; display: flex;
  align-items: center; justify-content: center;
}
.page-404 .box{ text-align: center; }
.page-404 .box h1{
  font-size: 5rem; font-weight: 900; margin-bottom: 10px;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.page-404 .box p{ color: var(--text2); margin-bottom: 20px; font-weight: 600; }
.page-404 .box a{ color: var(--purple); text-decoration: none; font-weight: 800; }