@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ============ THEME VARIABLES ============ */
:root {
    --bg-base: #ffffff; --bg-surface: #f8f9fb; --bg-elevated: #f1f3f6; --bg-overlay: #e8ecf1;
    --border: #d8dde5; --border-subtle: #e8ecf1;
    --white: #1a1d23; --text-primary: #1a1d23; --text-secondary: #5f6670; --text-muted: #8b919a;
    --accent: #06b587; --accent-light: #06d6a0; --accent-dim: rgba(6,181,135,0.08); --accent-glow: rgba(6,181,135,0.15);
    --blue: #2563eb; --blue-dim: rgba(37,99,235,0.08); --orange: #d97706; --red: #dc2626; --purple: #7c3aed;
    --radius: 10px; --radius-lg: 14px; --radius-xl: 20px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06); --shadow-lg: 0 8px 30px rgba(0,0,0,0.08); --shadow-glow: 0 0 20px var(--accent-glow);
    --font-display: 'Outfit', sans-serif; --font-body: 'DM Sans', sans-serif; --font-mono: 'JetBrains Mono', monospace;
    --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
    --navbar-bg: rgba(255,255,255,0.85); --card-bg: #ffffff;
}

[data-theme="dark"] {
    --bg-base: #0b0f19; --bg-surface: #131720; --bg-elevated: #1a1f2e; --bg-overlay: #212840;
    --border: #252d3d; --border-subtle: #1e2536;
    --white: #e8ecf1; --text-primary: #e2e8f0; --text-secondary: #8892a4; --text-muted: #5a6478;
    --accent: #06d6a0; --accent-light: #34ebc6; --accent-dim: rgba(6,214,160,0.1); --accent-glow: rgba(6,214,160,0.2);
    --blue: #3b82f6; --blue-dim: rgba(59,130,246,0.1); --orange: #f59e0b; --red: #ef4444; --purple: #8b5cf6;
    --shadow: 0 2px 8px rgba(0,0,0,0.3); --shadow-lg: 0 12px 40px rgba(0,0,0,0.4); --shadow-glow: 0 0 30px var(--accent-glow);
    --navbar-bg: rgba(11,15,25,0.9); --card-bg: #131720;
}

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

body { background: var(--bg-base); color: var(--text-primary); font-family: var(--font-body); line-height: 1.7; -webkit-font-smoothing: antialiased; overflow-x: hidden; display: flex; flex-direction: column; min-height: 100vh; margin: 0; }

/* ============ NAVBAR ============ */
.kd-navbar { background: var(--navbar-bg); backdrop-filter: blur(20px) saturate(180%); border-bottom: 1px solid var(--border-subtle); padding: 0 0; transition: all var(--transition); z-index: 1000; }
.kd-navbar .container { display: flex; align-items: center; height: 60px; }
.kd-navbar .navbar-brand { font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; color: var(--white) !important; display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-icon { width: 34px; height: 34px; background: linear-gradient(135deg, var(--accent), var(--blue)); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 900; font-size: 13px; }
.kd-navbar .nav-link { color: var(--text-secondary) !important; font-weight: 500; font-size: .88rem; padding: 8px 14px !important; border-radius: 8px; transition: all .2s; }
.kd-navbar .nav-link:hover, .kd-navbar .nav-link.active { color: var(--accent) !important; background: var(--accent-dim); }
.kd-navbar .dropdown-menu { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 6px; }
.kd-navbar .dropdown-item { color: var(--text-secondary); border-radius: 6px; padding: 8px 14px; font-size: .88rem; }
.kd-navbar .dropdown-item:hover { background: var(--accent-dim); color: var(--accent); }
.kd-navbar .dropdown-divider { border-color: var(--border-subtle); }
.search-input { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: 8px; padding: 6px 14px; font-size: .85rem; color: var(--text-primary); width: 160px; transition: all .3s; outline: none; }
.search-input:focus { border-color: var(--accent); width: 220px; box-shadow: 0 0 0 3px var(--accent-dim); }
.search-input::placeholder { color: var(--text-muted); }
.btn-accent { background: var(--accent); color: #fff; font-size: .82rem; font-weight: 600; padding: 6px 16px; border-radius: 8px; text-decoration: none; transition: all .2s; border: none; }
.btn-accent:hover { background: var(--accent-light); transform: translateY(-1px); color: #fff; }
.theme-btn { background: none; border: 1px solid var(--border-subtle); border-radius: 8px; width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--text-muted); transition: all .2s; font-size: 14px; }
.theme-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ============ HERO ============ */
.kd-hero { padding: 80px 0 60px; position: relative; overflow: hidden; }
.kd-hero::before { content: ''; position: absolute; top: -120px; right: -80px; width: 400px; height: 400px; background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%); pointer-events: none; }
.kd-hero h1 { font-family: var(--font-display); font-weight: 900; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.15; letter-spacing: -1px; color: var(--white); margin-bottom: 16px; }
.gradient-text { background: linear-gradient(135deg, var(--accent), var(--blue)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { color: var(--text-secondary); font-size: 1.1rem; line-height: 1.8; max-width: 520px; margin-bottom: 28px; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-dim); color: var(--accent); padding: 6px 16px; border-radius: 20px; font-size: .82rem; font-weight: 600; margin-bottom: 20px; border: 1px solid rgba(6,214,160,0.15); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-hero-primary { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: #fff; padding: 12px 24px; border-radius: 10px; text-decoration: none; font-weight: 600; font-size: .95rem; transition: all .3s; border: none; }
.btn-hero-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-glow); color: #fff; }
.btn-hero-secondary { display: inline-flex; align-items: center; gap: 8px; background: transparent; color: var(--text-secondary); padding: 12px 24px; border-radius: 10px; text-decoration: none; font-weight: 600; font-size: .95rem; border: 1px solid var(--border); transition: all .3s; }
.btn-hero-secondary:hover { border-color: var(--accent); color: var(--accent); }
.hero-visual { position: relative; }
.hero-code { background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; font-family: var(--font-mono); font-size: .82rem; line-height: 1.8; color: var(--text-secondary); box-shadow: var(--shadow); }

/* ============ STATS ============ */
.kd-stats { padding: 30px 0; }
.kd-stat-item { text-align: center; padding: 16px 8px; }
.kd-stat-number { font-family: var(--font-display); font-weight: 900; font-size: 1.8rem; color: var(--accent); }
.kd-stat-label { font-size: .82rem; color: var(--text-muted); margin-top: 2px; }

/* ============ SECTION ============ */
.kd-section-title { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; color: var(--white); display: flex; align-items: center; gap: 12px; }
.title-icon { width: 40px; height: 40px; background: var(--accent-dim); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: 18px; }

/* ============ CARDS ============ */
.kd-card { background: var(--card-bg); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); transition: all var(--transition); overflow: hidden; text-decoration: none; display: block; color: var(--text-primary); word-wrap: break-word; overflow-wrap: break-word; }
.kd-card:hover { border-color: var(--border); box-shadow: var(--shadow); transform: translateY(-2px); color: var(--text-primary); }
.row .col-md-6 > .kd-card, .row .col-lg-4 > .kd-card, .row .col-lg-3 > .kd-card, .row .col-md-4 > .kd-card { height: 100%; }
.kd-card .card-body { overflow: hidden; }
.kd-card-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.kd-card-title { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; color: var(--white); line-height: 1.3; }
.kd-card-desc { font-size: .88rem; color: var(--text-secondary); margin-top: 8px; line-height: 1.6; }
.kd-card-desc p { margin: 0; display: inline; }

/* ============ BADGES ============ */
.kd-badge { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 6px; font-size: .72rem; font-weight: 600; }
.kd-badge-green { background: rgba(6,181,135,0.1); color: var(--accent); }
.kd-badge-blue { background: rgba(37,99,235,0.1); color: var(--blue); }
.kd-badge-purple { background: rgba(124,58,237,0.1); color: var(--purple); }
.kd-badge-orange { background: rgba(217,119,6,0.1); color: var(--orange); }
.kd-badge-gray { background: var(--bg-elevated); color: var(--text-muted); }

/* ============ BUTTONS ============ */
.kd-btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: 8px; font-weight: 600; font-size: .88rem; cursor: pointer; transition: all .2s; text-decoration: none; border: none; width: 100%; justify-content: center; }
.kd-btn-primary { background: var(--accent); color: #fff; }
.kd-btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); color: #fff; }
.kd-btn-outline { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.kd-btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ============ FORMS ============ */
.kd-input { width: 100%; padding: 10px 16px; background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: 8px; color: var(--text-primary); font-size: .9rem; transition: all .2s; outline: none; }
.kd-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
.kd-input::placeholder { color: var(--text-muted); }
.kd-label { display: block; font-weight: 600; font-size: .82rem; color: var(--text-secondary); margin-bottom: 6px; }

/* ============ ALERTS ============ */
.kd-alert { padding: 12px 16px; border-radius: 8px; font-size: .88rem; display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.kd-alert-success { background: rgba(6,181,135,0.08); border: 1px solid rgba(6,181,135,0.15); color: var(--accent); }
.kd-alert-danger { background: rgba(220,38,38,0.08); border: 1px solid rgba(220,38,38,0.15); color: var(--red); }

/* ============ BREADCRUMB ============ */
.kd-breadcrumb { font-size: .82rem; color: var(--text-muted); display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.kd-breadcrumb a { color: var(--text-muted); text-decoration: none; }
.kd-breadcrumb a:hover { color: var(--accent); }
.kd-breadcrumb .current { color: var(--text-secondary); }

/* ============ AUTH ============ */
.kd-auth-card { background: var(--card-bg); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); padding: 36px 32px; box-shadow: var(--shadow); max-width: 420px; margin: 0 auto; }

/* ============ LESSON CONTENT ============ */
.lesson-content { font-size: 1rem; color: var(--text-primary); line-height: 1.85; }
.lesson-content * { color: var(--text-primary) !important; }
.lesson-content h1, .lesson-content h2, .lesson-content h3, .lesson-content h4, .lesson-content h5, .lesson-content h6 { color: var(--white) !important; font-family: var(--font-display); font-weight: 700; margin: 1.5em 0 .5em; }
.lesson-content p { margin: 0 0 1em; }
.lesson-content a { color: var(--accent) !important; text-decoration: underline; }
.lesson-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 16px 0; }
.lesson-content pre { background: #1e1e2e !important; color: #cdd6f4 !important; border-radius: 10px; padding: 20px; overflow-x: auto; margin: 16px 0; font-family: var(--font-mono); font-size: .85rem; line-height: 1.6; border: 1px solid var(--border-subtle); }
.lesson-content pre * { color: inherit !important; }
.lesson-content code:not(pre code) { background: var(--accent-dim); color: var(--accent) !important; padding: 2px 8px; border-radius: 4px; font-family: var(--font-mono); font-size: .85em; }

/* Terminal çıktısı stili */
.terminal-output { background: #0c0c0c !important; color: #4ade80 !important; border-radius: 10px; padding: 4px 0 16px; margin: 16px 0; font-family: var(--font-mono); font-size: .83rem; line-height: 1.7; border: 1px solid #1a3a2a; position: relative; overflow-x: auto; }
.terminal-output * { color: #4ade80 !important; }
.terminal-output::before { content: '● ● ●'; display: block; padding: 10px 16px 8px; font-size: 10px; letter-spacing: 4px; color: #374151 !important; border-bottom: 1px solid #1a2a1a; margin-bottom: 8px; }
.terminal-output code { display: block; padding: 0 20px; background: transparent !important; }
.terminal-output .prompt { color: #06d6a0 !important; }
.terminal-output .output { color: #e2e8f0 !important; }

/* Bilgi kutuları */
.info-box { background: rgba(59,130,246,0.08); border: 1px solid rgba(59,130,246,0.15); border-left: 3px solid #3b82f6; border-radius: 0 10px 10px 0; padding: 16px 20px; margin: 16px 0; font-size: .9rem; }
.info-box strong { color: #3b82f6 !important; }
.warning-box { background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.15); border-left: 3px solid #f59e0b; border-radius: 0 10px 10px 0; padding: 16px 20px; margin: 16px 0; font-size: .9rem; }
.warning-box strong { color: #f59e0b !important; }
.success-box { background: rgba(6,214,160,0.08); border: 1px solid rgba(6,214,160,0.15); border-left: 3px solid #06d6a0; border-radius: 0 10px 10px 0; padding: 16px 20px; margin: 16px 0; font-size: .9rem; }
.success-box strong { color: #06d6a0 !important; }

/* Alıştırma kutusu */
.exercise-box { background: rgba(139,92,246,0.06); border: 1px solid rgba(139,92,246,0.15); border-radius: 12px; padding: 20px 24px; margin: 20px 0; }
.exercise-box h4 { color: #8b5cf6 !important; font-size: 1rem; margin-bottom: 10px; }
.exercise-box ol, .exercise-box ul { margin: 8px 0; padding-left: 20px; }

/* Özet tablosu */
.lesson-content table.summary-table { display: table; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
.lesson-content table.summary-table th { background: var(--accent-dim); color: var(--accent) !important; font-weight: 600; border: 1px solid var(--border); }
.lesson-content table.summary-table td { border: 1px solid var(--border); }
.lesson-content blockquote { border-left: 3px solid var(--accent); padding: 12px 20px; margin: 16px 0; background: var(--accent-dim); border-radius: 0 8px 8px 0; }
.lesson-content table { width: 100%; border-collapse: collapse; overflow-x: auto; display: block; max-width: 100%; }
.lesson-content th, .lesson-content td { border: 1px solid var(--border); padding: 8px 12px; }
.lesson-content th { background: var(--bg-elevated); font-weight: 600; }
.lesson-content ul, .lesson-content ol { padding-left: 24px; margin: 8px 0 16px; }
.lesson-content li { margin: 4px 0; }

/* ============ PROGRESS ============ */
.kd-progress { height: 8px; background: var(--bg-elevated); border-radius: 4px; overflow: hidden; }
.kd-progress-bar { height: 100%; background: linear-gradient(90deg, var(--accent), var(--blue)); border-radius: 4px; transition: width .6s ease; }
.progress { background: var(--bg-elevated) !important; border-radius: 4px; height: 8px; }
.progress-bar { background: linear-gradient(90deg, var(--accent), var(--blue)) !important; }

/* ============ FOOTER ============ */
.kd-footer { background: var(--bg-surface); border-top: 1px solid var(--border-subtle); padding: 48px 0 20px; margin-top: auto !important; }
.kd-footer h6 { color: var(--white); font-family: var(--font-display); font-weight: 700; font-size: .85rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.kd-footer a:not(.footer-social a) { display: block; color: var(--text-secondary); font-size: .88rem; text-decoration: none; padding: 3px 0; transition: color .2s; }
.kd-footer a:not(.footer-social a):hover { color: var(--accent); }
.footer-social a { width: 36px; height: 36px; background: var(--bg-elevated); border-radius: 10px; display: inline-flex; align-items: center; justify-content: center; color: var(--text-muted); text-decoration: none; transition: all .2s; }
.footer-social a:hover { background: var(--accent-dim); color: var(--accent); }
.footer-bottom { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--border-subtle); color: var(--text-muted); font-size: .82rem; }

/* ============ EMPTY STATE ============ */
.kd-empty { text-align: center; padding: 60px 20px; }
.kd-empty-icon { width: 72px; height: 72px; background: var(--accent-dim); border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; margin-bottom: 16px; color: var(--accent); font-size: 28px; }

/* ============ ANIMATION ============ */
.animate-in { opacity: 0; transform: translateY(20px); animation: fadeInUp .6s ease forwards; }
.animate-in-1 { animation-delay: .1s; } .animate-in-2 { animation-delay: .2s; } .animate-in-3 { animation-delay: .3s; }
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }

/* ============ PAGINATION ============ */
.pagination .page-link { background: var(--card-bg); border-color: var(--border); color: var(--text-secondary); }
.pagination .page-link:hover { background: var(--accent-dim); color: var(--accent); border-color: var(--accent); }
.pagination .page-item.active .page-link { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ============ BOOTSTRAP OVERRIDES ============ */
.btn-outline-secondary { border-color: var(--border) !important; color: var(--text-secondary) !important; }
.btn-primary { background: var(--accent) !important; border-color: var(--accent) !important; color: #fff !important; }

/* ============ RESPONSIVE ============ */
@media (max-width: 991px) {
    .search-input { width: 100%; margin: 8px 0; }
    .search-input:focus { width: 100%; }
    .kd-hero { padding: 50px 0 30px; }
}
@media (max-width: 767px) {
    .kd-hero { padding: 30px 0 20px; }
    .kd-hero h1 { font-size: 1.75rem; letter-spacing: -0.5px; }
    .hero-desc { font-size: 1rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions a { width: 100%; justify-content: center; }
    .kd-stat-number { font-size: 1.4rem; }
    .kd-section-title { font-size: 1.3rem; }
    .kd-auth-card { padding: 24px 18px; }
    .lesson-content { font-size: .95rem; }
    .lesson-content pre { font-size: .8rem; padding: 14px; }
}

/* ============ OVERFLOW FIXES ============ */
html { overflow-x: hidden; }
.container { max-width: 100%; }
.lesson-content pre { overflow-x: auto; max-width: 100%; }
.comment-list { max-width: 100%; overflow: hidden; }

/* ============ PRINT ============ */
@media print { .kd-navbar, .kd-footer, .btn, .theme-btn { display: none !important; } body { background: #fff; color: #000; } }