/* =============================================================================
   DersTeders - Dinamik Sinif Ders Sayfasi (pages/sinif.html)
   Dinamik mufredat verisini render eden bilesenlerin stilleri.
   Ders rengi --ders-renk degiskeni ile JS tarafindan atanir.
   ============================================================================= */

:root {
  --primary: var(--ders-renk, #3B82F6);
  --primary-text: color-mix(in srgb, var(--primary) 55%, #04141A);
  --bg: #FFF;
  --bg-alt: #F8FAFC;
  --surface: #F1F5F9;
  --text: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, .08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, .07);
  --transition: .2s ease;
  --ders-soft: color-mix(in srgb, var(--primary) 8%, transparent);
  --ders-green: #2F9E6B;
  --ders-red: #C0492F;
  --ders-gold: #C5923E;
}

[data-theme="dark"] {
  --primary-text: color-mix(in srgb, var(--primary) 88%, #fff);
  --bg: #0F172A;
  --bg-alt: #1E293B;
  --surface: #334155;
  --text: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted: #8FA3BC;
  --border: #334155;
  --shadow: 0 1px 3px rgba(0, 0, 0, .3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, .3);
  --ders-green: #4CC38A;
  --ders-red: #E8776A;
  --ders-gold: #E0B562;
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--primary-text); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, .9); border-bottom: 1px solid var(--border); backdrop-filter: blur(12px); }
[data-theme="dark"] .site-header { background: rgba(15, 23, 42, .9); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-family: 'Instrument Serif', Georgia, serif; font-size: 1.25rem; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; }
.nav { display: flex; gap: 32px; }
.nav a { color: var(--text-secondary); font-size: .9rem; font-weight: 500; transition: color var(--transition); }
.nav a:hover { color: var(--primary-text); text-decoration: none; }
.header-right { display: flex; align-items: center; gap: 12px; }
.icon-btn { width: 40px; height: 40px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all var(--transition); }
.icon-btn:hover { background: var(--surface); }
.icon-btn svg { width: 20px; height: 20px; fill: none; stroke: var(--text); stroke-width: 2; }
.auth-buttons { display: flex; align-items: center; gap: 10px; }
.auth-buttons a { font-size: .88rem; font-weight: 600; padding: 8px 16px; border-radius: var(--radius-sm); transition: all var(--transition); }
.btn-login { color: var(--text-secondary); border: 1px solid var(--border); }
.btn-login:hover { background: var(--surface); text-decoration: none; }
.btn-register { background: color-mix(in srgb, var(--primary) 55%, #04141A); color: #fff; }
.btn-register:hover { text-decoration: none; filter: brightness(.92); }
.user-menu { display: none; align-items: center; gap: 12px; font-size: .88rem; }
.user-menu a { font-weight: 600; }
.btn-logout { border: 1px solid var(--border); background: var(--bg); color: var(--text-secondary); padding: 7px 14px; border-radius: var(--radius-sm); cursor: pointer; font-family: inherit; font-size: .85rem; font-weight: 600; }
.btn-logout:hover { background: var(--surface); }

/* Hero */
.hero { padding: 72px 0 56px; background: linear-gradient(135deg, color-mix(in srgb, var(--ders-renk) 78%, #04141A), color-mix(in srgb, var(--ders-renk) 52%, #071E24)); color: #fff; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
.hero .wrap { position: relative; z-index: 1; }
.eyebrow { display: inline-block; padding: 6px 16px; background: rgba(255, 255, 255, .15); border-radius: 20px; font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 16px; }
.hero h1 { font-family: 'Instrument Serif', Georgia, serif; font-size: clamp(2rem, 5vw, 3rem); font-weight: 400; margin-bottom: 12px; }
.hero h1 em { font-style: normal; opacity: .82; font-weight: 500; }
.hero p { font-size: 1.1rem; opacity: .92; max-width: 680px; margin-bottom: 28px; }
.hero-actions { margin: 0 0 24px; display: flex; flex-wrap: wrap; gap: 12px; }
.hero-stats { display: flex; gap: 44px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat b { display: block; font-size: 2rem; font-family: 'Instrument Serif', Georgia, serif; }
.stat span { font-size: .85rem; opacity: .82; }

/* Buttons */
.btn-slayt-hero { display: inline-flex; align-items: center; gap: 8px; padding: 12px 26px; background: linear-gradient(135deg, #C5923E, #E3B45C); color: #201400; border-radius: 12px; font-size: .95rem; font-weight: 700; transition: all var(--transition); }
.btn-slayt-hero:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0, 0, 0, .25); text-decoration: none; }
.btn-quiz { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; background: color-mix(in srgb, var(--ders-renk) 55%, #04141A); color: #fff; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 600; transition: all var(--transition); }
.btn-quiz:hover { text-decoration: none; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-slayt { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; background: #0F6B7C; color: #fff; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 600; transition: all var(--transition); }
.btn-slayt:hover { background: #0A4C58; text-decoration: none; transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* Sections */
.section { padding: 60px 0; }
.section:nth-child(even) { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head .label { display: inline-block; padding: 4px 14px; background: var(--ders-soft); color: var(--primary-text); border-radius: 20px; font-size: .8rem; font-weight: 600; margin-bottom: 12px; }
.section-head h2 { font-family: 'Instrument Serif', Georgia, serif; font-size: 2rem; font-weight: 700; }

/* Unit accordion */
.unit-accordion { display: flex; flex-direction: column; gap: 16px; }
.unit-item { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: box-shadow var(--transition); animation: slideUp .4s ease both; }
.unit-item:hover { box-shadow: var(--shadow-md); }
.unit-header { width: 100%; display: flex; align-items: center; gap: 16px; padding: 20px 24px; background: var(--bg); border: none; cursor: pointer; text-align: left; transition: background var(--transition); font-family: inherit; color: inherit; }
.unit-header:hover { background: var(--surface); }
.unit-num { font-family: 'Instrument Serif', Georgia, serif; font-size: 1.5rem; font-weight: 400; color: var(--primary-text); min-width: 48px; }
.unit-header h3 { font-size: 1.1rem; font-weight: 600; }
.unit-header p { font-size: .85rem; color: var(--text-muted); margin-top: 2px; }
.chev { width: 24px; height: 24px; margin-left: auto; fill: none; stroke: var(--text-muted); stroke-width: 2; transition: transform .3s ease; flex-shrink: 0; }
.unit-item.open .chev { transform: rotate(180deg); }
.unit-content { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.unit-item.open .unit-content { max-height: 400000px; }

/* Topic */
.topic-card { border-top: 1px solid var(--border); padding: 0 24px; }
.topic-header { display: flex; align-items: flex-start; gap: 16px; padding: 20px 0; cursor: pointer; }
.topic-num { font-weight: 600; color: var(--primary-text); min-width: 36px; padding-top: 2px; }
.topic-header h4 { font-size: 1.08rem; font-weight: 700; letter-spacing: -0.01em; }
.topic-header p { font-size: .92rem; line-height: 1.6; color: var(--text-secondary); margin-top: 4px; }
.topic-body { display: none; padding: 0 0 28px 48px; animation: fadeIn .3s ease; }
.topic-card.active .topic-body { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Topic text content */
/* Uzun metin okuma konforu: rahat satır aralığı, sınırlı satır uzunluğu, net hiyerarşi, kalıcı ölçek */
.topic-text { margin-bottom: 20px; max-width: 68ch; font-size: calc(1.04rem * var(--read-scale, 1)); line-height: 1.8; color: var(--text-secondary); text-wrap: pretty; }
.topic-text h2 { font-family: 'Instrument Serif', Georgia, serif; font-size: 1.45rem; margin: 10px 0 14px; line-height: 1.3; }
.topic-text h3 { font-size: 1.2rem; font-weight: 700; margin: 1.5em 0 .55em; color: var(--text); line-height: 1.4; }
.topic-text h4 { font-size: 1.1em; font-weight: 700; margin: 1.5em 0 .5em; color: color-mix(in srgb, var(--ders-renk, #0F6B7C) 78%, var(--text)); line-height: 1.45; }
.topic-text h5 { font-size: 1.02em; font-weight: 700; margin: 1.3em 0 .45em; color: var(--text); }
.topic-text p { font-size: inherit; color: var(--text); margin-bottom: 1.05em; }
.topic-text ul, .topic-text ol { margin: .5em 0 1.2em 1.35em; color: var(--text); }
.topic-text li { margin-bottom: .5em; font-size: inherit; line-height: inherit; }
.topic-text li::marker { color: var(--ders-renk, #0F6B7C); }
.topic-text strong { color: var(--text); font-weight: 700; }
.topic-text blockquote { border-left: 3px solid var(--primary); padding: 12px 16px; margin: 16px 0; background: var(--ders-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-style: italic; color: var(--text-secondary); }
.topic-text code { background: var(--surface); padding: 2px 6px; border-radius: 4px; font-family: 'JetBrains Mono', monospace; font-size: .9em; }
.topic-text table, .content-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .93rem; line-height: 1.6; }
.topic-text table th, .topic-text table td, .content-table th, .content-table td { border: 1px solid var(--border); padding: 9px 14px; text-align: left; overflow-wrap: anywhere; }
.topic-text table th, .content-table th { background: var(--surface); font-weight: 700; color: var(--text); }
.topic-text table tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--surface) 55%, transparent); }

/* Boxes */
.concept-box, .info-box, .warning-box, .step-box, .example-box, .formula-box {
  border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 20px; margin: 16px 0; background: var(--bg-alt);
}
.concept-box { background: var(--ders-soft); border-color: color-mix(in srgb, var(--ders-renk) 22%, transparent); }
.info-box { background: color-mix(in srgb, #3B82F6 6%, transparent); border-color: color-mix(in srgb, #3B82F6 22%, transparent); }
.warning-box { background: color-mix(in srgb, #F59E0B 8%, transparent); border-color: color-mix(in srgb, #F59E0B 25%, transparent); }

.learning-objectives { background: linear-gradient(135deg, var(--ders-soft), transparent); border: 1px solid color-mix(in srgb, var(--ders-renk) 28%, transparent); border-left: 5px solid var(--ders-renk); border-radius: var(--radius-sm); padding: 16px 22px; margin: 0 0 20px; }
.learning-objectives h4 { font-size: .95rem; font-weight: 700; color: var(--primary-text); margin-bottom: 10px; }
.learning-objectives ul { list-style: none; margin: 0; padding: 0; }
.learning-objectives li { position: relative; padding: 5px 0 5px 24px; font-size: .9rem; color: var(--text-secondary); }
.learning-objectives li::before { content: '\2713'; position: absolute; left: 0; color: var(--ders-green); font-weight: 700; }

.formula-box { background: linear-gradient(135deg, color-mix(in srgb, var(--ders-gold) 12%, transparent), transparent); border: 1px solid color-mix(in srgb, var(--ders-gold) 45%, transparent); position: relative; }
.formula-box::before { content: 'Formüller'; position: absolute; top: -11px; left: 16px; background: var(--bg); padding: 0 8px; font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ders-gold); }
.formula-box .f-title { font-weight: 700; color: var(--primary-text); font-size: .9rem; margin: 8px 0 6px; }
.formula-box .f-row { font-family: 'JetBrains Mono', monospace; font-size: 1rem; padding: 6px 10px; margin: 6px 0; background: var(--bg); border-radius: 6px; display: block; overflow-x: auto; color: var(--text); }
.formula-box p { font-size: .88rem; color: var(--text-secondary); margin: 4px 0; }

.examples { margin-bottom: 20px; }
.examples h4 { font-size: .95rem; font-weight: 600; margin-bottom: 12px; color: var(--primary-text); }
.example-card { background: var(--bg); border: 1px solid var(--border); border-left: 4px solid var(--ders-renk); border-radius: var(--radius-sm); padding: 16px 20px; margin-bottom: 12px; box-shadow: var(--shadow); }
.example-card strong:first-child { display: inline-block; background: var(--ders-renk); color: #fff; padding: 2px 10px; border-radius: 20px; font-size: .78rem; font-weight: 700; margin-bottom: 8px; }
.example-card p { font-size: .9rem; color: var(--text-secondary); }
.example-card .step { margin: 6px 0; padding-left: 24px; position: relative; font-size: .9rem; color: var(--text-secondary); display: block; }
.example-card .step::before { content: '\2192'; position: absolute; left: 0; color: var(--ders-gold); font-weight: 700; }
.example-card .step b { color: var(--primary-text); }
.example-card .answer { display: block; margin-top: 10px; padding: 8px 12px; border-radius: 6px; background: color-mix(in srgb, var(--ders-green) 12%, transparent); border: 1px solid color-mix(in srgb, var(--ders-green) 35%, transparent); font-weight: 700; color: var(--ders-green); font-size: .9rem; }

.common-mistakes { background: color-mix(in srgb, var(--ders-red) 8%, transparent); border: 1px solid color-mix(in srgb, var(--ders-red) 32%, transparent); border-radius: var(--radius-sm); padding: 16px 20px; margin: 18px 0; }
.common-mistakes h4 { font-size: .95rem; font-weight: 700; color: var(--ders-red); margin-bottom: 10px; }
.common-mistakes ul { margin: 0; padding: 0; list-style: none; }
.common-mistakes li { position: relative; padding: 6px 0 6px 22px; font-size: .9rem; color: var(--text-secondary); border-bottom: 1px dashed color-mix(in srgb, var(--ders-red) 20%, transparent); }
.common-mistakes li:last-child { border-bottom: none; }
.common-mistakes li::before { content: '\2715'; position: absolute; left: 0; color: var(--ders-red); font-weight: 700; }
.common-mistakes li b { color: var(--ders-red); }

.tips { background: color-mix(in srgb, var(--ders-gold) 12%, transparent); border: 1px dashed color-mix(in srgb, var(--ders-gold) 55%, transparent); border-radius: var(--radius-sm); padding: 16px 20px; margin: 18px 0; }
.tips h4 { font-size: .95rem; font-weight: 700; color: var(--ders-gold); margin-bottom: 10px; }
.tips ul { margin: 0; padding: 0; list-style: none; }
.tips li { position: relative; padding: 5px 0 5px 22px; font-size: .9rem; color: var(--text-secondary); }
.tips li::before { content: '\2605'; position: absolute; left: 2px; color: var(--ders-gold); }

.summary { background: linear-gradient(135deg, var(--ders-soft), var(--bg)); border: 1px solid color-mix(in srgb, var(--ders-renk) 30%, transparent); border-radius: var(--radius); padding: 18px 22px; margin: 20px 0; }
.summary h4 { font-size: .95rem; font-weight: 700; color: var(--primary-text); margin-bottom: 10px; }
.summary p { font-size: .9rem; color: var(--text-secondary); margin-bottom: 8px; }
.summary ul { margin: 6px 0 0 18px; }
.summary li { font-size: .9rem; color: var(--text-secondary); margin-bottom: 4px; }

.topic-actions { padding: 16px 0 20px 52px; border-top: 1px solid var(--border); display: none; gap: 8px; flex-wrap: wrap; }
.topic-card.active .topic-actions { display: flex; }

/* States */
.state-box { max-width: 720px; margin: 80px auto; text-align: center; padding: 40px 24px; }
.state-box .icon { font-size: 3rem; margin-bottom: 12px; }
.state-box h2 { font-family: 'Instrument Serif', Georgia, serif; font-size: 1.6rem; margin-bottom: 8px; }
.state-box p { color: var(--text-secondary); margin-bottom: 20px; }
.spinner { width: 46px; height: 46px; border: 4px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; margin: 0 auto 16px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0; background: var(--bg-alt); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; font-size: .85rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--text-secondary); font-size: .85rem; }

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; }
  .hero { padding: 44px 0 38px; }
  .hero-stats { gap: 22px; }
  .stat b { font-size: 1.5rem; }
  .unit-header { padding: 16px; }
  .topic-card { padding: 0 16px; }
  .topic-body { padding-left: 0; }
  .topic-actions { padding-left: 0; }
  .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
}