:root {
    /* LIGHT MODE (Default) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(0, 0, 0, 0.08);
    --card-bg: #ffffff;
    --danger: #ef4444;
    --success: #10b981;
    --tech-bg-gradient: linear-gradient(135deg, #f0fdf4 0%, #e0e7ff 100%);
}

[data-theme="dark"] {
    /* DARK MODE */
    --bg-primary: #0a0a0f;
    --bg-secondary: #13141f;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent-glow: rgba(139, 92, 246, 0.5);
    --glass-bg: rgba(22, 24, 35, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --card-bg: rgba(30, 32, 47, 0.6);
    --tech-bg-gradient: radial-gradient(circle at 10% 20%, rgba(124, 58, 237, 0.1), transparent 30%),
                        radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.07), transparent 30%);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    background-image: var(--tech-bg-gradient);
    background-attachment: fixed;
    transition: background-color 0.3s, color 0.3s;
}

/* CONTAINER & LAYOUT */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* HEADER & NAVBAR */
#header {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    box-shadow: 0 0 15px var(--accent-glow);
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.theme-toggle:hover {
    background: var(--glass-border);
}

.login-btn {
    text-decoration: none;
    padding: 10px 20px;
    background: var(--accent-color);
    color: #fff;
    border-radius: 20px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 10px var(--accent-glow);
}

.login-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.mobile-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.mobile-menu span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: 0.3s;
}

/* HERO SECTION */
.hero {
    padding: 100px 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.highlight {
    color: var(--accent-color);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* CARDS SECTION */
.cards-section {
    padding: 60px 0;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.tech-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--glass-border);
    border-color: var(--accent-color);
}

/* Pastel Border Card Themes */
.card-takvim { border: 1px solid rgba(147, 197, 253, 0.4); }
.card-yonetim { border: 1px solid rgba(253, 186, 116, 0.4); }
.card-hesaplama { border: 1px solid rgba(110, 231, 183, 0.4); }
.card-arama { border: 1px solid rgba(196, 181, 253, 0.4); }

.card-takvim:hover { border-color: #93c5fd; box-shadow: 0 20px 40px rgba(147, 197, 253, 0.15); }
.card-yonetim:hover { border-color: #fdba74; box-shadow: 0 20px 40px rgba(253, 186, 116, 0.15); }
.card-hesaplama:hover { border-color: #6ee7b7; box-shadow: 0 20px 40px rgba(110, 231, 183, 0.15); }
.card-arama:hover { border-color: #c4b5fd; box-shadow: 0 20px 40px rgba(196, 181, 253, 0.15); }

.card-image-wrapper {
    width: 100%;
    height: 160px;
    margin-bottom: 20px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.tech-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.tech-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 25px;
    flex-grow: 1;
}

.tech-btn {
    display: inline-block;
    padding: 12px 25px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 25px;
    border: 1px solid var(--glass-border);
    font-weight: 600;
    transition: all 0.3s;
}

.tech-btn:hover {
    background: var(--glass-border);
    color: var(--accent-color);
}

.highlight-btn {
    background: var(--accent-color) !important;
    color: #fff !important;
    border: none;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.highlight-btn:hover {
    background: var(--accent-hover) !important;
    transform: scale(1.05);
}

.prepared-by-section {
    text-align: center;
    padding: 40px 0;
}

.highlight-gold {
    color: #fbbf24;
}

/* FOOTER */
#footer {
    padding: 40px 0;
    border-top: 1px solid var(--glass-border);
    margin-top: 60px;
    background: var(--bg-secondary);
}

#footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    margin: 0 10px;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--accent-color);
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* PORTAL SCRAPER UI INTEGRATION (arama.html) */
.spinner {
    width: 20px; height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 1s infinite linear;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

.app-container {
    display: flex;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

.sidebar {
    width: 300px;
    padding: 30px;
    border-right: 1px solid var(--glass-border);
    background: rgba(100,100,100,0.02);
}

.sidebar select, .sidebar input[type="text"] {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 12px;
    color: var(--text-primary);
    margin-top: 8px;
}
.sidebar select:focus, .sidebar input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.custom-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 20px;
    transition: 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}
.btn-primary:hover { background: var(--accent-hover); }

.content-area {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    max-height: 80vh;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 20px;
}

.main-header h1 {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.main-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat-badge {
    background: var(--accent-glow);
    color: var(--accent-color);
    padding: 6px 12px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.85rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.course-card {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 20px;
    position: relative;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.course-card.remote { border-top: 4px solid var(--success); }
.course-card.face { border-top: 4px solid var(--accent-color); }

.course-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 10px 0 15px;
}

.course-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.meta-item {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.badge {
    background: var(--glass-border);
    padding: 4px 10px;
    border-radius: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border: 1px solid transparent;
}
.badge.remote { color: var(--success); border-color: rgba(16, 185, 129, 0.3); background: rgba(16, 185, 129, 0.1); }
.badge.face { color: var(--accent-color); border-color: var(--accent-glow); background: rgba(99, 102, 241, 0.05); }

/* Vurgulu İlçe/Lokasyon Rozeti */
.badge.location {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid rgba(251, 191, 36, 0.4);
    border-left: 3px solid #fbbf24;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 10px rgba(251, 191, 36, 0.15);
    padding: 4px 12px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 50px 0;
    color: var(--text-secondary);
}

.hidden { display: none !important; }

/* TOAST */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 15px 20px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 8px;
    z-index: 9999;
    transform: translateY(150%);
    opacity: 0;
    transition: 0.3s;
}
.toast.error { background: var(--danger); color: white; }

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* =============================================
   FRESHNESS METER WIDGET
   ============================================= */
.freshness-widget {
    margin-top: 25px;
    padding: 18px;
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.freshness-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.freshness-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
}

.freshness-badge {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 20px;
    transition: background 0.5s, color 0.5s;
    white-space: nowrap;
}

/* Badge durumları */
.freshness-badge.fresh   { background: rgba(16,185,129,0.15); color: #10b981; }
.freshness-badge.ok      { background: rgba(234,179,8,0.15);  color: #ca8a04; }
.freshness-badge.aging   { background: rgba(249,115,22,0.15); color: #ea580c; }
.freshness-badge.stale   { background: rgba(239,68,68,0.15);  color: #ef4444; }
.freshness-badge.scraping {
    background: rgba(99,102,241,0.15);
    color: var(--accent-color);
    animation: pulse-badge 1.2s ease-in-out infinite;
}

@keyframes pulse-badge {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.5; }
}

/* Bar zemin */
.freshness-bar-track {
    position: relative;
    width: 100%;
    height: 10px;
    border-radius: 99px;
    background: linear-gradient(
        to right,
        rgba(16,185,129,0.25)   0%,
        rgba(234,179,8,0.25)   50%,
        rgba(239,68,68,0.25)  100%
    );
    overflow: visible;
    margin-bottom: 8px;
}

/* Dolu kısım (yeşilden kırmıza kayan gradient) */
.freshness-bar-fill {
    position: absolute;
    left: 0; top: 0; bottom: 0;
    border-radius: 99px;
    background: linear-gradient(
        to right,
        #10b981 0%,
        #eab308 50%,
        #ef4444 100%
    );
    background-size: 300% 100%; /* Başlangıçta yeşil uçta */
    background-position: 0% 50%;
    transition: width 1s linear, background-position 1s linear;
    width: 0%;
}

/* Hareketli kafa (indicator dot) */
.freshness-bar-head {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid #10b981;
    box-shadow: 0 0 6px rgba(0,0,0,0.15);
    transition: left 1s linear, border-color 1s linear, box-shadow 1s linear;
    left: 0%;
}

/* Taranıyor durumunda kafa parlar */
.freshness-bar-head.scraping {
    animation: head-pulse 1s ease-in-out infinite;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.25);
}

@keyframes head-pulse {
    0%, 100% { box-shadow: 0 0 0 2px rgba(99,102,241,0.2); }
    50%       { box-shadow: 0 0 0 6px rgba(99,102,241,0.35); }
}

/* Zone etiketleri */
.freshness-zones {
    display: flex;
    justify-content: space-between;
    font-size: 0.68rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    padding: 0 2px;
}

/* Geçen süre metni */
.freshness-elapsed {
    text-align: center;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    transition: color 0.5s;
}

/* Son güncelleme alt metni */
.freshness-sub {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 80px; left: 0; width: 100%;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        text-align: center;
        border-bottom: 1px solid var(--glass-border);
    }
    .nav-links.active { display: flex; }
    .mobile-menu { display: flex; }
    .app-container { flex-direction: column; }
    .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--glass-border); }
    .content-area { max-height: none; padding: 20px; }
    .hero h1 { font-size: 2.5rem; }
}