/* ── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Duolingo tarzı renkler */
  --duo-dark:    #1C1F2E;
  --duo-darker:  #151722;
  --duo-panel:   #222538;
  --duo-border:  #2E3248;
  --duo-green:   #58CC02;
  --duo-green-d: #46A302;
  --duo-yellow:  #FFD900;
  --duo-red:     #FF4B4B;
  --duo-blue:    #1CB0F6;
  --duo-purple:  #CE82FF;
  --duo-orange:  #FF9600;
  --duo-text:    #FFFFFF;
  --duo-text-m:  #AFAFAF;
  --duo-text-d:  #6B7280;

  /* Sınav renkleri */
  --lgs:   #FF6B6B; --lgs-d:  #E55555;
  --yks:   #7C3AED; --yks-d:  #6D28D9;
  --tyt:   #10B981; --tyt-d:  #059669;
  --ayt:   #F59E0B; --ayt-d:  #D97706;
  --ydt:   #3B82F6; --ydt-d:  #2563EB;

  --primary:   #6C63FF;
  --primary-d: #5A52D5;
  --bg:        #F0F2FF;
  --card:      #FFFFFF;
  --text:      #2D3748;
  --text-muted:#718096;
  --border:    #E2E8F0;
  --shadow:    0 4px 24px rgba(108,99,255,.12);
  --radius:    16px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--duo-dark);
  color: var(--duo-text);
  min-height: 100vh;
}

/* ── Yardımcılar ──────────────────────────────────────────────────────────── */
.hidden { display: none !important; }
.w-full { width: 100%; }
.mt-4 { margin-top: 1rem; }

/* ── Butonlar ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .75rem 1.5rem; border-radius: 12px; border: none; cursor: pointer;
  font-size: .95rem; font-weight: 700; transition: all .15s ease;
  text-decoration: none; letter-spacing: .3px;
}
.btn:active { transform: translateY(2px); }
.btn-green {
  background: var(--duo-green); color: #fff;
  box-shadow: 0 4px 0 var(--duo-green-d);
}
.btn-green:hover { background: #5bdb02; }
.btn-green:active { box-shadow: none; }
.btn-blue {
  background: var(--duo-blue); color: #fff;
  box-shadow: 0 4px 0 #0e91d5;
}
.btn-blue:hover { filter: brightness(1.1); }
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 4px 0 var(--primary-d);
}
.btn-primary:hover { filter: brightness(1.1); }
.btn-primary:active { box-shadow: none; }
.btn-outline {
  background: transparent; border: 2px solid var(--duo-border); color: var(--duo-text);
}
.btn-outline:hover { background: var(--duo-border); }
.btn-ghost { background: transparent; color: var(--duo-text-m); border: none; }
.btn-ghost:hover { color: var(--duo-text); }
.btn-danger { background: var(--duo-red); color: #fff; box-shadow: 0 4px 0 #c43a3a; }
.btn-sm { padding: .4rem .9rem; font-size: .82rem; border-radius: 8px; }

/* ── Form elemanları ──────────────────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: .4rem; }
.form-group label { font-size: .83rem; font-weight: 600; color: var(--duo-text-m); text-transform: uppercase; letter-spacing: .5px; }
.form-control {
  padding: .75rem 1rem; border: 2px solid var(--duo-border); border-radius: 12px;
  font-size: .95rem; background: var(--duo-panel); color: var(--duo-text);
  transition: border-color .2s, box-shadow .2s;
}
.form-control:focus {
  outline: none; border-color: var(--duo-blue);
  box-shadow: 0 0 0 3px rgba(28,176,246,.2);
}
select.form-control { cursor: pointer; }
select.form-control option { background: var(--duo-panel); }
.error-msg { color: var(--duo-red); font-size: .83rem; font-weight: 600; margin-top: .5rem; }

/* ─────────────────────────────────────────────────────────────────────────── */
/*   GİRİŞ / KAYIT SAYFASI (index.html)                                       */
/* ─────────────────────────────────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--duo-darker) 0%, #1a1d35 50%, #0f1020 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 2rem 1rem; flex-direction: column;
  position: relative; overflow: hidden;
}
.auth-page::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(108,99,255,.15) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(88,204,2,.1) 0%, transparent 50%);
  pointer-events: none;
}

.auth-card {
  background: var(--duo-panel);
  border: 1.5px solid var(--duo-border);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  width: 100%; max-width: 460px;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
  position: relative; z-index: 1;
  animation: slideUp .4s ease;
}

@keyframes slideUp {
  from { opacity:0; transform:translateY(30px); }
  to   { opacity:1; transform:translateY(0); }
}

.auth-logo {
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  margin-bottom: 1.75rem;
}
.auth-logo img { width: 110px; height: auto; animation: mascotBounce 2s ease-in-out infinite; filter: drop-shadow(0 4px 12px rgba(0,0,0,0.25)); }
.auth-logo .site-name {
  font-size: 1.8rem; font-weight: 800; color: var(--duo-green); letter-spacing: -0.5px;
}
.auth-logo .tagline { font-size: .85rem; color: var(--duo-text-m); font-weight: 500; }

/* Adım göstergesi */
.step-indicator {
  display: flex; align-items: center; justify-content: center; gap: .5rem;
  margin-bottom: 1.75rem;
}
.step-dot {
  width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center;
  justify-content: center; font-size: .8rem; font-weight: 700; transition: all .3s ease;
}
.step-dot.active   { background: var(--duo-blue); color: white; box-shadow: 0 3px 12px rgba(28,176,246,.4); }
.step-dot.done     { background: var(--duo-green); color: white; }
.step-dot.inactive { background: var(--duo-border); color: var(--duo-text-m); }
.step-line { flex: 1; height: 3px; background: var(--duo-border); border-radius: 2px; max-width: 60px; }
.step-line.done { background: var(--duo-green); }

.step-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 1.25rem; color: var(--duo-text); }

/* Alan etiketi */
.field-label {
  display: block; font-size: .72rem; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; color: var(--duo-text-m); margin-bottom: .45rem;
}

/* Sınıf seçici kartları */
.grade-options {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: .4rem;
}
.grade-option {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 2px solid var(--duo-border); border-radius: 10px; padding: .55rem .2rem;
  cursor: pointer; transition: all .18s ease; background: var(--duo-darker); gap: .08rem;
}
.grade-option--wide { grid-column: span 2; flex-direction: row; gap: .35rem; }
.grade-option:hover { border-color: var(--duo-blue); transform: translateY(-2px); }
.grade-option.selected {
  border-color: var(--duo-green); background: rgba(88,204,2,.12);
  box-shadow: 0 0 0 3px rgba(88,204,2,.18); transform: translateY(-2px);
}
.grade-num { font-size: 1.1rem; font-weight: 800; color: var(--duo-text); line-height: 1; }
.grade-sub { font-size: .58rem; font-weight: 600; color: var(--duo-text-m); text-transform: uppercase; letter-spacing: .04em; }
.grade-option.selected .grade-num,
.grade-option.selected .grade-sub { color: var(--duo-green); }

/* Sınav türü kartları */
.exam-options {
  display: grid; grid-template-columns: 1fr 1fr; gap: .55rem; margin-top: .25rem;
}
.exam-option {
  display: flex; flex-direction: column; align-items: center; gap: .2rem;
  border: 2.5px solid var(--duo-border); border-radius: 14px; padding: .85rem .5rem .65rem;
  cursor: pointer; text-align: center; transition: all .2s ease; background: var(--duo-darker);
}
.exam-icon { font-size: 1.4rem; line-height: 1; }
.exam-name { font-size: 1rem; font-weight: 800; color: var(--duo-text); letter-spacing: .02em; }
.exam-desc { font-size: .58rem; font-weight: 600; color: var(--duo-text-m); text-transform: uppercase; letter-spacing: .05em; }
.exam-option:hover { border-color: var(--duo-blue); transform: translateY(-2px); }
.exam-option.selected { border-color: transparent; transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,.35); }
.exam-option.selected .exam-name,
.exam-option.selected .exam-desc { color: white; opacity: 1; }
.exam-option[data-val="LGS"].selected { background: var(--lgs); }
.exam-option[data-val="YKS"].selected { background: var(--yks); }
.exam-option[data-val="TYT"].selected { background: var(--tyt); }
.exam-option[data-val="AYT"].selected { background: var(--ayt); }
.exam-option[data-val="YDT"].selected { background: var(--ydt); }
.exam-option[data-val="LGS"]:not(.selected) { border-color: var(--lgs); }
.exam-option[data-val="LGS"]:not(.selected) .exam-name { color: var(--lgs); }
.exam-option[data-val="YKS"]:not(.selected) { border-color: var(--yks); }
.exam-option[data-val="YKS"]:not(.selected) .exam-name { color: var(--yks); }
.exam-option[data-val="TYT"]:not(.selected) { border-color: var(--tyt); }
.exam-option[data-val="TYT"]:not(.selected) .exam-name { color: var(--tyt); }
.exam-option[data-val="AYT"]:not(.selected) { border-color: var(--ayt); }
.exam-option[data-val="AYT"]:not(.selected) .exam-name { color: var(--ayt); }
.exam-option[data-val="YDT"]:not(.selected) { border-color: var(--ydt); }
.exam-option[data-val="YDT"]:not(.selected) .exam-name { color: var(--ydt); }

/* ─────────────────────────────────────────────────────────────────────────── */
/*   DUOLINGO LAYOUT (dashboard.html & learn.html)                            */
/* ─────────────────────────────────────────────────────────────────────────── */

.duo-layout {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  min-height: 100vh;
}

/* Sol Sidebar */
.duo-sidebar {
  background: var(--duo-darker);
  border-right: 1.5px solid var(--duo-border);
  padding: 1.5rem 1rem;
  position: sticky; top: 0; height: 100vh;
  overflow-y: auto; overflow-x: hidden; display: flex; flex-direction: column;
}
.duo-logo {
  display: flex; align-items: center; gap: .75rem;
  padding: .5rem .75rem 1.5rem;
  text-decoration: none;
}
.duo-logo-img { width: 48px; height: auto; animation: mascotBounce 2s ease-in-out infinite; filter: drop-shadow(0 2px 6px rgba(0,0,0,0.2)); }
.duo-logo-text { font-size: 1.15rem; font-weight: 800; color: var(--duo-green); letter-spacing: -0.3px; }
.globe-spin {
  font-size: 2rem;
  display: inline-flex;
  flex-shrink: 0;
  width: 2.2rem;
  height: 2.2rem;
  overflow: hidden;
  align-items: center;
  justify-content: center;
  animation: globeRotate 6s linear infinite;
  transform-origin: center center;
  filter: drop-shadow(0 2px 8px rgba(28,176,246,.4));
}
@keyframes globeRotate {
  0%   { transform: rotate(0deg);   }
  100% { transform: rotate(360deg); }
}

.duo-nav { display: flex; flex-direction: column; gap: .25rem; flex: 1; }
.duo-nav-item {
  display: flex; align-items: center; gap: .85rem;
  padding: .75rem 1rem; border-radius: 12px; cursor: pointer;
  font-weight: 700; font-size: .9rem; text-decoration: none;
  color: var(--duo-text-m); transition: all .15s ease; border: 2px solid transparent;
  text-transform: uppercase; letter-spacing: .4px;
}
.duo-nav-item:hover { background: var(--duo-panel); color: var(--duo-text); }
.duo-nav-item.active { background: rgba(88,204,2,.1); color: var(--duo-green); border-color: var(--duo-green); }
.duo-nav-item .nav-icon { font-size: 1.3rem; flex-shrink: 0; }

/* Orta İçerik */
.duo-main {
  max-width: 700px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
  width: 100%;
}

/* Sağ Panel */
.duo-aside {
  padding: 2rem 1.25rem;
  border-left: 1.5px solid var(--duo-border);
  display: flex; flex-direction: column; gap: 1.25rem;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}

/* Stats bar (üstte) */
.duo-statsbar {
  display: flex; align-items: center; gap: 1.25rem;
  padding: .75rem 1.25rem;
  border-bottom: 1.5px solid var(--duo-border);
  background: var(--duo-darker);
  position: sticky; top: 0; z-index: 50;
  grid-column: 2 / 3;
}
.duo-stat-item {
  display: flex; align-items: center; gap: .4rem;
  font-size: .9rem; font-weight: 700;
}
.duo-stat-icon { font-size: 1.1rem; }
.duo-stat-val { color: var(--duo-text); }
.stat-fire { color: var(--duo-orange); }
.stat-gem  { color: var(--duo-blue); }
.stat-heart { color: var(--duo-red); }
.stat-xp   { color: var(--duo-yellow); }

/* ── Hareketli Sincap ─────────────────────────────────────────────────────── */
@keyframes mascotBounce {
  0%   { transform: translateY(0) rotate(0deg); }
  25%  { transform: translateY(-7px) rotate(-1deg); }
  50%  { transform: translateY(-9px) rotate(0deg); }
  75%  { transform: translateY(-7px) rotate(1deg); }
  100% { transform: translateY(0) rotate(0deg); }
}
@keyframes mascotWiggle {
  0%, 100% { transform: rotate(0); }
  25%       { transform: rotate(-8deg); }
  75%       { transform: rotate(8deg); }
}
@keyframes mascotJump {
  0%   { transform: translateY(0) scale(1); }
  30%  { transform: translateY(-20px) scale(1.05); }
  60%  { transform: translateY(-10px) scale(1.02); }
  100% { transform: translateY(0) scale(1); }
}
@keyframes mascotShake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-8px); }
  75%       { transform: translateX(8px); }
}
@keyframes mascotCelebrate {
  0%   { transform: scale(1) rotate(0); }
  25%  { transform: scale(1.15) rotate(-10deg); }
  50%  { transform: scale(1.2) rotate(10deg); }
  75%  { transform: scale(1.1) rotate(-5deg); }
  100% { transform: scale(1) rotate(0); }
}
.mascot-bounce  { animation: mascotBounce 2s ease-in-out infinite; }
.mascot-wiggle  { animation: mascotWiggle 0.4s ease; }
.mascot-jump    { animation: mascotJump 0.6s ease; }
.mascot-shake   { animation: mascotShake 0.4s ease; }
.mascot-celebrate { animation: mascotCelebrate 0.6s ease; }

.mascot-large { width: 80px; height: auto; cursor: pointer; }
.mascot-medium { width: 60px; height: auto; }
.mascot-small { width: 40px; height: auto; }

/* Sincap konuşma baloncuğu */
.mascot-bubble {
  background: var(--duo-panel); border: 2px solid var(--duo-border);
  border-radius: 12px; padding: .45rem .7rem;
  font-size: .76rem; font-weight: 600; color: var(--duo-text);
  position: relative; max-width: 160px; line-height: 1.35;
}
.mascot-bubble::before {
  content: ''; position: absolute; left: -10px; top: 50%;
  transform: translateY(-50%);
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 10px solid var(--duo-border);
}
.mascot-bubble::after {
  content: ''; position: absolute; left: -7px; top: 50%;
  transform: translateY(-50%);
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-right: 9px solid var(--duo-panel);
}

/* ── Dashboard Sınav Kartları ─────────────────────────────────────────────── */
.exam-select-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem;
}
.exam-select-card {
  background: var(--duo-panel); border: 2px solid var(--duo-border);
  border-radius: 16px; padding: 1.25rem; cursor: pointer;
  transition: all .2s ease; text-decoration: none; display: block;
  position: relative; overflow: hidden;
}
.exam-select-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; border-radius: 16px 16px 0 0;
}
.exam-select-card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,.3); }
.exam-select-card.lgs::before { background: var(--lgs); }
.exam-select-card.lgs:hover { border-color: var(--lgs); }
.exam-select-card.yks::before { background: var(--yks); }
.exam-select-card.yks:hover { border-color: var(--yks); }
.exam-select-card.tyt::before { background: var(--tyt); }
.exam-select-card.tyt:hover { border-color: var(--tyt); }
.exam-select-card.ayt::before { background: var(--ayt); }
.exam-select-card.ayt:hover { border-color: var(--ayt); }
.exam-select-card.ydt::before { background: var(--ydt); }
.exam-select-card.ydt:hover { border-color: var(--ydt); }

.exam-card-emoji { font-size: 2.4rem; margin-bottom: .5rem; display: block; }
.exam-card-name { font-size: 1.3rem; font-weight: 900; color: var(--duo-text); }
.exam-card-desc { font-size: .78rem; color: var(--duo-text-m); margin: .3rem 0 .75rem; line-height: 1.5; }
.exam-card-meta { display: flex; align-items: center; justify-content: space-between; }
.exam-card-konu { font-size: .75rem; color: var(--duo-text-d); font-weight: 600; }
.exam-progress-ring { font-size: .8rem; font-weight: 700; }
.exam-progress-ring.done { color: var(--duo-green); }
.exam-progress-ring.none { color: var(--duo-text-d); }

/* ── Sağ Panel Widget'ları ────────────────────────────────────────────────── */
.aside-widget {
  background: var(--duo-panel); border: 1.5px solid var(--duo-border);
  border-radius: 16px; padding: 1.25rem;
}
.widget-title {
  font-size: .8rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .6px; color: var(--duo-text-m); margin-bottom: 1rem;
}
.leaderboard-item {
  display: flex; align-items: center; gap: .75rem;
  padding: .5rem 0; border-bottom: 1px solid var(--duo-border);
}
.leaderboard-item:last-child { border-bottom: none; }
.lb-rank { font-size: .8rem; font-weight: 700; color: var(--duo-text-d); width: 20px; text-align: center; }
.lb-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: .85rem; font-weight: 800; color: white;
  background: linear-gradient(135deg, var(--primary), var(--duo-purple));
  flex-shrink: 0;
}
.lb-name { flex: 1; font-size: .85rem; font-weight: 600; }
.lb-xp { font-size: .8rem; font-weight: 700; color: var(--duo-yellow); }

.daily-goal {
  display: flex; align-items: center; gap: .75rem; margin-bottom: .75rem;
}
.daily-goal-icon { font-size: 1.4rem; }
.daily-goal-info { flex: 1; }
.daily-goal-label { font-size: .83rem; font-weight: 700; }
.daily-goal-progress-wrap { background: var(--duo-darker); border-radius: 6px; height: 8px; margin-top: .3rem; overflow: hidden; }
.daily-goal-bar { height: 100%; border-radius: 6px; background: var(--duo-green); transition: width .5s ease; }

.streak-badge {
  display: flex; align-items: center; gap: 1rem;
  padding: .75rem;
  background: linear-gradient(135deg, rgba(255,150,0,.1), rgba(255,150,0,.05));
  border-radius: 12px; border: 1px solid rgba(255,150,0,.2);
}
.streak-fire { font-size: 2.2rem; }
.streak-num { font-size: 1.6rem; font-weight: 900; color: var(--duo-orange); line-height: 1; }
.streak-label { font-size: .75rem; color: var(--duo-text-m); font-weight: 600; }

/* ── PATH MAP (learn.html) ────────────────────────────────────────────────── */
.path-header {
  background: var(--duo-panel); border: 2px solid var(--duo-border);
  border-radius: 16px; padding: 1.25rem 1.5rem;
  display: flex; align-items: center; gap: 1rem; margin-bottom: 2rem;
  position: relative; overflow: hidden;
}
.path-header::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.path-header.lgs::before { background: var(--lgs); }
.path-header.yks::before { background: var(--yks); }
.path-header.tyt::before { background: var(--tyt); }
.path-header.ayt::before { background: var(--ayt); }
.path-header.ydt::before { background: var(--ydt); }
.path-header-emoji { font-size: 2rem; }
.path-header-info { flex: 1; }
.path-header-name { font-size: 1.3rem; font-weight: 900; }
.path-header-sub { font-size: .8rem; color: var(--duo-text-m); margin-top: .2rem; }
.btn-guide {
  display: flex; align-items: center; gap: .4rem;
  background: var(--duo-yellow); color: #1C1F2E;
  border: none; border-radius: 10px; padding: .55rem 1rem;
  font-weight: 700; font-size: .83rem; cursor: pointer;
  box-shadow: 0 3px 0 #ccad00;
  transition: all .15s;
}
.btn-guide:hover { filter: brightness(1.05); }
.btn-guide:active { box-shadow: none; transform: translateY(2px); }

/* Konu düğümleri yolu */
.topic-path {
  display: flex; flex-direction: column; align-items: center;
  gap: 0; position: relative;
}

.topic-section { width: 100%; margin-bottom: 2.5rem; }
.section-divider {
  display: flex; align-items: center; gap: 1rem;
  margin-bottom: 1.5rem; padding: 0 1rem;
}
.section-divider-line { flex: 1; height: 2px; background: var(--duo-border); }
.section-divider-label {
  font-size: .75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .6px; color: var(--duo-text-d);
  background: var(--duo-panel); border: 1px solid var(--duo-border);
  padding: .3rem .75rem; border-radius: 20px;
}

.topic-nodes {
  display: flex; flex-direction: column; align-items: center; gap: 1rem;
  position: relative;
}

/* Düğüm bağlantı çizgisi */
.topic-nodes::before {
  content: ''; position: absolute;
  left: 50%; top: 40px; bottom: 40px;
  width: 3px; background: var(--duo-border);
  transform: translateX(-50%);
  z-index: 0;
}

.topic-node-row {
  display: flex; align-items: center; gap: 1rem;
  position: relative; z-index: 1;
  width: 340px;
}
.topic-node-row.left  { flex-direction: row; justify-content: flex-start; padding-left: 20px; }
.topic-node-row.right { flex-direction: row; justify-content: flex-end;  padding-right: 20px; }
.topic-node-row.center { justify-content: center; }

.topic-node {
  display: flex; flex-direction: column; align-items: center;
  cursor: pointer; transition: transform .2s;
  position: relative;
}
.topic-node:hover { transform: scale(1.05); }

.node-circle {
  width: 72px; height: 72px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem; position: relative;
  box-shadow: 0 5px 0 rgba(0,0,0,.4); transition: all .2s;
  border: 3px solid transparent;
}
.node-circle.locked {
  background: #2A2D3F; border-color: var(--duo-border);
  box-shadow: 0 5px 0 #1a1c2a;
}
.node-circle.locked .node-icon { filter: grayscale(1) opacity(.4); }
.node-circle.active {
  background: var(--duo-green);
  border-color: rgba(255,255,255,.3);
  box-shadow: 0 5px 0 var(--duo-green-d), 0 0 20px rgba(88,204,2,.3);
  animation: nodePulse 2s ease-in-out infinite;
}
.node-circle.done {
  background: var(--duo-green);
  border-color: rgba(255,255,255,.2);
  box-shadow: 0 5px 0 var(--duo-green-d);
}
.node-circle.done .node-icon::after {
  content: '✓'; position: absolute; bottom: -2px; right: -2px;
  background: var(--duo-green); border-radius: 50%;
  width: 20px; height: 20px; font-size: .7rem; font-weight: 900; color: white;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--duo-darker);
}

@keyframes nodePulse {
  0%, 100% { box-shadow: 0 5px 0 var(--duo-green-d), 0 0 20px rgba(88,204,2,.3); }
  50%       { box-shadow: 0 5px 0 var(--duo-green-d), 0 0 35px rgba(88,204,2,.5); }
}

.node-label {
  margin-top: .5rem; text-align: center; width: 90px;
}
.node-name { font-size: .72rem; font-weight: 700; color: var(--duo-text); line-height: 1.3; }
.node-ders { font-size: .62rem; color: var(--duo-text-m); margin-top: .15rem; }

.node-star-count {
  display: flex; gap: 2px; margin-top: .25rem; justify-content: center;
}
.node-star { font-size: .65rem; color: var(--duo-yellow); }
.node-star.empty { filter: grayscale(1) opacity(.4); }

/* START butonu üstte */
.start-badge {
  background: var(--duo-green); color: white;
  font-size: .72rem; font-weight: 800; padding: .25rem .65rem;
  border-radius: 6px; margin-bottom: .35rem;
  text-transform: uppercase; letter-spacing: .5px;
  box-shadow: 0 2px 0 var(--duo-green-d);
}

/* Mascot yol üzerinde */
.path-mascot {
  display: flex; align-items: center; gap: 1rem;
  margin: 1rem 0;
}
.path-mascot img { width: 64px; height: auto; animation: mascotBounce 2s ease-in-out infinite; }

/* Kasa/sandık */
.chest-node {
  background: none; border: none; cursor: pointer;
  font-size: 3rem; padding: .5rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.4));
  transition: transform .2s;
}
.chest-node:hover { transform: scale(1.1); }

/* ── DERS SAYFASI (lesson.html) ───────────────────────────────────────────── */
.lesson-layout {
  min-height: 100vh; background: var(--duo-dark);
  display: flex; flex-direction: column;
}

.lesson-header {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--duo-darker);
  border-bottom: 1.5px solid var(--duo-border);
  position: sticky; top: 0; z-index: 100;
}
.lesson-close {
  background: none; border: none; color: var(--duo-text-m); cursor: pointer;
  font-size: 1.5rem; line-height: 1; padding: .25rem; border-radius: 8px;
  transition: all .15s;
}
.lesson-close:hover { background: var(--duo-border); color: var(--duo-text); }
.lesson-progress-wrap {
  flex: 1; height: 14px; background: var(--duo-border); border-radius: 8px; overflow: hidden;
}
.lesson-progress-bar {
  height: 100%; border-radius: 8px; background: var(--duo-green);
  transition: width .4s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 0 8px rgba(88,204,2,.4);
}
.lesson-hearts { display: flex; gap: .25rem; }
.lesson-heart { font-size: 1.2rem; transition: transform .2s; }
.lesson-heart.lost { filter: grayscale(1) opacity(.4); transform: scale(.85); }

.lesson-body {
  flex: 1; max-width: 680px; margin: 0 auto;
  padding: 2rem 1.5rem; width: 100%;
}

/* Konu anlatımı slaytları */
.slide-card {
  background: var(--duo-panel); border: 2px solid var(--duo-border);
  border-radius: 20px; padding: 2rem; min-height: 340px;
  display: flex; flex-direction: column; gap: 1rem;
  animation: slideIn .3s ease;
}
@keyframes slideIn {
  from { opacity:0; transform:translateX(30px); }
  to   { opacity:1; transform:translateX(0); }
}
.slide-icon { font-size: 3rem; text-align: center; }
.slide-title { font-size: 1.25rem; font-weight: 800; color: var(--duo-green); text-align: center; }
.slide-content {
  font-size: .92rem; line-height: 1.8; color: var(--duo-text);
  white-space: pre-line; flex: 1;
  background: var(--duo-darker); border-radius: 12px; padding: 1.25rem;
}
.slide-nav { display: flex; justify-content: space-between; align-items: center; }
.slide-dots { display: flex; gap: .4rem; }
.slide-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--duo-border); transition: background .2s; }
.slide-dot.active { background: var(--duo-green); }

/* Soru kartı */
.question-slide {
  animation: slideIn .3s ease;
}
.question-prompt {
  font-size: .8rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .6px; color: var(--duo-text-d); margin-bottom: .5rem;
}
.question-text {
  font-size: 1.05rem; font-weight: 700; color: var(--duo-text);
  background: var(--duo-panel); border: 2px solid var(--duo-border);
  border-radius: 14px; padding: 1.25rem; margin-bottom: 1.25rem;
  line-height: 1.6;
}
.question-num {
  font-size: .75rem; font-weight: 600; color: var(--duo-text-d);
  margin-bottom: .5rem;
}

.option-list { display: flex; flex-direction: column; gap: .6rem; }
.option-btn {
  display: flex; align-items: center; gap: .85rem;
  padding: .9rem 1.1rem; border-radius: 14px;
  border: 2.5px solid var(--duo-border); background: var(--duo-panel);
  cursor: pointer; text-align: left; font-size: .92rem; font-weight: 600;
  transition: all .15s ease; color: var(--duo-text);
  width: 100%;
}
.option-btn:hover:not(:disabled):not(.correct):not(.wrong) {
  border-color: var(--duo-blue); background: rgba(28,176,246,.08);
  transform: translateX(3px);
}
.option-btn:disabled { cursor: not-allowed; }
.option-letter {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: var(--duo-border); display: flex; align-items: center; justify-content: center;
  font-size: .8rem; font-weight: 800; transition: all .15s;
}
.option-btn:hover:not(:disabled) .option-letter { background: var(--duo-blue); color: white; }
.option-btn.correct { border-color: var(--duo-green); background: rgba(88,204,2,.1); color: #a8f060; }
.option-btn.correct .option-letter { background: var(--duo-green); color: white; }
.option-btn.wrong   { border-color: var(--duo-red); background: rgba(255,75,75,.1); color: #ff8080; }
.option-btn.wrong   .option-letter { background: var(--duo-red); color: white; }
.option-btn.reveal  { border-color: var(--duo-green); background: rgba(88,204,2,.08); opacity: .8; }
.option-btn.reveal  .option-letter { background: var(--duo-green); color: white; }

/* Feedback bar altta */
.lesson-footer {
  border-top: 1.5px solid var(--duo-border);
  padding: 1.25rem 1.5rem;
  background: var(--duo-darker);
  position: sticky; bottom: 0;
}
.feedback-correct {
  background: rgba(88,204,2,.1); border: 2px solid var(--duo-green);
  border-radius: 14px; padding: 1rem 1.25rem;
  display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem;
}
.feedback-wrong {
  background: rgba(255,75,75,.1); border: 2px solid var(--duo-red);
  border-radius: 14px; padding: 1rem 1.25rem;
  display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem;
}
.feedback-icon { font-size: 1.5rem; }
.feedback-title { font-weight: 800; font-size: .95rem; }
.feedback-sub { font-size: .82rem; color: var(--duo-text-m); margin-top: .2rem; }
.feedback-correct .feedback-title { color: var(--duo-green); }
.feedback-wrong .feedback-title { color: var(--duo-red); }

/* ── KUTLAMA EKRANI ───────────────────────────────────────────────────────── */
.celebration-screen {
  min-height: 100vh; background: var(--duo-dark);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 2rem; text-align: center;
  animation: fadeIn .5s ease;
}
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }

.celebration-bg {
  position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0;
}
.confetti {
  position: absolute; width: 10px; height: 10px; border-radius: 2px;
  animation: confettiFall linear infinite;
}
@keyframes confettiFall {
  0% { transform: translateY(-20px) rotate(0); opacity:1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity:0; }
}

.celebration-content { position: relative; z-index: 1; max-width: 480px; }
.celebration-mascot { width: 120px; height: auto; animation: mascotCelebrate .6s ease infinite alternate; margin-bottom: 1rem; }
.celebration-title {
  font-size: 2.2rem; font-weight: 900; color: var(--duo-yellow);
  margin-bottom: .5rem;
}
.celebration-sub { font-size: 1rem; color: var(--duo-text-m); margin-bottom: 2rem; }
.score-display {
  background: var(--duo-panel); border: 2px solid var(--duo-border);
  border-radius: 20px; padding: 1.5rem 2rem; margin-bottom: 1.5rem;
  display: flex; gap: 2rem; justify-content: center;
}
.score-item { text-align: center; }
.score-val { font-size: 2rem; font-weight: 900; color: var(--duo-green); }
.score-lbl { font-size: .78rem; color: var(--duo-text-m); font-weight: 600; text-transform: uppercase; letter-spacing: .5px; }
.xp-gained {
  background: linear-gradient(135deg, rgba(255,217,0,.1), rgba(255,150,0,.1));
  border: 2px solid rgba(255,217,0,.3);
  border-radius: 14px; padding: .85rem 1.5rem;
  font-size: 1.1rem; font-weight: 800; color: var(--duo-yellow);
  margin-bottom: 1.5rem; display: inline-flex; align-items: center; gap: .5rem;
}

/* ── Loader & Toast ──────────────────────────────────────────────────────── */
.loader {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 1rem; padding: 3rem;
  color: var(--duo-text-m);
}
.spinner {
  width: 48px; height: 48px; border: 4px solid var(--duo-border);
  border-top-color: var(--duo-green); border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  background: var(--duo-panel); border: 1.5px solid var(--duo-border); color: var(--duo-text);
  padding: .7rem 1.25rem; border-radius: 12px;
  font-size: .88rem; font-weight: 600;
  box-shadow: 0 4px 20px rgba(0,0,0,.4);
  z-index: 9999; pointer-events: none;
  animation: toastIn .3s ease, toastOut .3s ease 1.7s forwards;
}
@keyframes toastIn  { from { opacity:0; transform: translateX(-50%) translateY(20px); } to { opacity:1; transform: translateX(-50%) translateY(0); } }
@keyframes toastOut { to   { opacity:0; transform: translateX(-50%) translateY(20px); } }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .duo-layout { grid-template-columns: 200px 1fr 240px; }
}
@media (max-width: 900px) {
  .duo-layout { grid-template-columns: 1fr; }
  .duo-sidebar { display: none; }
  .duo-aside { display: none; }
  .duo-statsbar { display: none; }
  .exam-select-grid { grid-template-columns: 1fr; }
  .topic-node-row { width: 280px; }
}
@media (max-width: 640px) {
  .auth-card { padding: 1.75rem 1.25rem; }
  .duo-main { padding: 1.25rem 1rem 4rem; }
  .lesson-body { padding: 1.25rem 1rem; }
  .topic-node-row { width: 240px; }
  .node-circle { width: 60px; height: 60px; font-size: 1.5rem; }
}

/* ── Eski bottom-nav (sorular.html) ──────────────────────────────────────── */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  background: var(--duo-darker); border-top: 1.5px solid var(--duo-border);
  display: flex; box-shadow: 0 -4px 20px rgba(0,0,0,.2);
}
.bottom-nav-item {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: .2rem; padding: .65rem .5rem;
  cursor: pointer; border: none; background: transparent;
  font-size: .68rem; font-weight: 700; color: var(--duo-text-d);
  transition: all .2s ease; text-decoration: none;
  border-top: 3px solid transparent;
}
.bottom-nav-item .nav-icon { font-size: 1.3rem; }
.bottom-nav-item:hover, .bottom-nav-item.active { color: var(--duo-green); border-top-color: var(--duo-green); }
.bottom-nav-item.lgs-nav:hover, .bottom-nav-item.lgs-nav.active { color:var(--lgs); border-top-color:var(--lgs); }
.bottom-nav-item.yks-nav:hover, .bottom-nav-item.yks-nav.active { color:var(--yks); border-top-color:var(--yks); }
.bottom-nav-item.tyt-nav:hover, .bottom-nav-item.tyt-nav.active { color:var(--tyt); border-top-color:var(--tyt); }
.bottom-nav-item.ayt-nav:hover, .bottom-nav-item.ayt-nav.active { color:var(--ayt); border-top-color:var(--ayt); }
.bottom-nav-item.ydt-nav:hover, .bottom-nav-item.ydt-nav.active { color:var(--ydt); border-top-color:var(--ydt); }

/* ── Alt NAV (mobil) ─────────────────────────────────────────────────────── */
.mobile-bottom-nav {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  background: var(--duo-darker); border-top: 1.5px solid var(--duo-border);
  padding: .5rem 0;
}
@media (max-width: 900px) { .mobile-bottom-nav { display: flex; } }
.mobile-nav-item {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  gap: .2rem; padding: .4rem .25rem; text-decoration: none;
  font-size: .62rem; font-weight: 700; color: var(--duo-text-m);
  text-transform: uppercase; letter-spacing: .3px;
  transition: color .15s; border-top: 2px solid transparent;
}
.mobile-nav-item .nav-icon { font-size: 1.3rem; }
.mobile-nav-item.active { color: var(--duo-green); border-top-color: var(--duo-green); }

/* ── Eski soru sayfası uyumluluk ─────────────────────────────────────────── */
.questions-page { background: var(--duo-dark); padding-bottom: 5rem; }
.q-topbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--duo-darker); border-bottom: 1.5px solid var(--duo-border);
  padding: .85rem 1.25rem;
  display: flex; align-items: center; gap: .75rem;
}
.q-topbar .back-btn {
  background: var(--duo-border); border: none; border-radius: 10px;
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1.1rem; transition: all .2s; flex-shrink: 0; color: var(--duo-text);
}
.q-topbar .back-btn:hover { background: var(--duo-green); }
.q-topbar-info .cat-name { font-size: 1.1rem; font-weight: 800; color: var(--duo-text); }
.q-topbar-info .cat-desc { font-size: .78rem; color: var(--duo-text-m); }
.q-main { max-width: 820px; margin: 0 auto; padding: 1.25rem 1rem; }
.question-card {
  background: var(--duo-panel); border-radius: 16px;
  border: 2px solid var(--duo-border); margin-bottom: 1.25rem; overflow: hidden;
}
.question-card.answered-correct { border-color: var(--duo-green); }
.question-card.answered-wrong   { border-color: var(--duo-red); }
.q-header { padding: 1rem 1.25rem .75rem; display: flex; align-items: flex-start; gap: .75rem; }
.q-num  { font-size: .75rem; font-weight: 700; color: var(--duo-text-d); white-space: nowrap; padding-top:.15rem; }
.q-text { font-size: .97rem; font-weight: 600; line-height: 1.6; flex: 1; color: var(--duo-text); }
.q-topic { font-size:.7rem; color:var(--duo-text-d); font-weight:600; background:var(--duo-darker); border-radius:6px; padding:.2rem .5rem; }
.options-grid { display:grid; grid-template-columns:1fr 1fr; gap:.5rem; padding:0 1.25rem 1.25rem; }
@media(max-width:500px){.options-grid{grid-template-columns:1fr;}}
.answer-feedback { margin:0 1.25rem .75rem; padding:.55rem .9rem; border-radius:8px; font-size:.82rem; font-weight:600; display:flex; align-items:center; gap:.4rem; }
.answer-feedback.correct{background:rgba(88,204,2,.1);color:#a8f060;border:1.5px solid var(--duo-green);}
.answer-feedback.wrong{background:rgba(255,75,75,.1);color:#ff8080;border:1.5px solid var(--duo-red);}
.q-subbar{background:var(--duo-darker);border-bottom:1px solid var(--duo-border);padding:.6rem 1.25rem;display:flex;align-items:center;justify-content:space-between;gap:.75rem;flex-wrap:wrap;}
.q-stats{display:flex;gap:1rem;}
.q-stat{display:flex;align-items:center;gap:.35rem;font-size:.82rem;font-weight:600;color:var(--duo-text-m);}
.dot{width:10px;height:10px;border-radius:50%;}
.dot-dogru{background:var(--duo-green);}
.dot-yanlis{background:var(--duo-red);}
.dot-bos{background:var(--duo-border);}
.filter-btn{display:flex;align-items:center;gap:.3rem;padding:.35rem .75rem;border:1.5px solid var(--duo-border);border-radius:8px;background:var(--duo-panel);font-size:.78rem;font-weight:600;cursor:pointer;transition:all .2s;color:var(--duo-text-m);}
.filter-btn.active{border-color:var(--duo-green);color:var(--duo-green);background:rgba(88,204,2,.08);}
.topic-tag{font-size:.73rem;font-weight:700;padding:.2rem .55rem;border-radius:12px;border:1.5px solid var(--duo-border);cursor:pointer;transition:all .2s;color:var(--duo-text-d);}
.topic-tag:hover{border-color:var(--duo-green);color:var(--duo-green);}
.topic-tag.active{background:var(--duo-green);border-color:var(--duo-green);color:white;}
.empty-state{text-align:center;padding:3rem 1rem;color:var(--duo-text-m);}
.empty-state .empty-icon{font-size:3.5rem;margin-bottom:1rem;}
.ai-bubble{margin:0 1.25rem .75rem;display:inline-flex;align-items:center;gap:.4rem;background:linear-gradient(135deg,#1a1a2e,#16213e);color:white;border-radius:20px;padding:.35rem .85rem .35rem .6rem;font-size:.78rem;font-weight:700;box-shadow:0 3px 12px rgba(0,0,0,.3);}