/* =========================================
   GENEL TEMA VE YAPI STİLLERİ
========================================= */
body {
    transition: background-color 0.3s ease, color 0.3s ease;
    /* BURADAKİ PADDING-TOP SATIRINI TAMAMEN SİLDİK */
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

body.has-fixed-bottom {
    padding-bottom: 160px; /* Kaydırma boşluğunu artırdık */
}

/* Navbar */
.navbar {
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: background-color 0.3s ease, border-color 0.3s ease;
    /* DÜZELTME: Hem standart boşluğu (1rem) ver, hem de telefon çentiği varsa üstüne ekle */
    padding-top: calc(1rem + env(safe-area-inset-top)) !important;
    padding-bottom: 1rem !important;
}
.navbar-brand { font-weight: 700; letter-spacing: 1px; }

/* =========================================
   MENÜ BUTONLARI HOVER DÜZELTMESİ (YENİ)
========================================= */
/* Butonların üstüne gelince arka planın yazıyı yutmasını engeller. 
   Bunun yerine arka plana hafif, transparan ve şık bir vurgu tonu verir. */
.navbar .btn[class*="btn-outline-"]:hover {
    background-color: rgba(128, 140, 170, 0.55) !important;
    border-color: transparent !important;
}

/* Kartlar */
.card {
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 1px solid var(--bs-border-color);
}
.card:hover { transform: translateY(-5px); }

/* Tablolar */
.table { border-color: var(--bs-border-color); }
.table-hover > tbody > tr:hover > * { transition: background-color 0.2s; }

/* Form ve Butonlar */
.form-control { border-radius: 8px; transition: border-color 0.2s, box-shadow 0.2s; }
.btn { border-radius: 8px; font-weight: 600; font-size: 0.95rem; }


/* =========================================
   KARANLIK TEMA (DARK MODE) ÖZEL AYARLARI
========================================= */
[data-bs-theme="dark"] body { background-color: #121212; color: #e0e0e0; }
[data-bs-theme="dark"] .navbar { background-color: #1a1a1a !important; border-bottom: 1px solid #333; box-shadow: 0 4px 12px rgba(0,0,0,0.5); }
[data-bs-theme="dark"] .navbar-brand { color: #ffc107 !important; }
[data-bs-theme="dark"] .card { background-color: #1e1e1e; border-color: #2a2a2a; }
[data-bs-theme="dark"] .card-ders:hover { border-color: #0dcaf0; box-shadow: 0 10px 20px rgba(13, 202, 240, 0.1) !important; }
[data-bs-theme="dark"] .card-etut:hover { border-color: #198754; box-shadow: 0 10px 20px rgba(25, 135, 84, 0.1) !important; }
[data-bs-theme="dark"] .table-dark th { background-color: #1a1a1a; color: #ffc107; border-bottom: 2px solid #333; }
[data-bs-theme="dark"] .table-hover > tbody > tr:hover > * { background-color: rgba(255,255,255,0.05); color: #fff; }
[data-bs-theme="dark"] .form-control { background-color: #252525; border-color: #3a3a3a; color: #fff; }
[data-bs-theme="dark"] .form-control:focus { background-color: #2b2b2b; }
[data-bs-theme="dark"] .date-row { background-color: rgba(255, 193, 7, 0.05) !important; border-top: 2px solid #333; }
[data-bs-theme="dark"] .fixed-bottom-bar { background-color: #1a1a1a; border-top: 1px solid #333; box-shadow: 0 -5px 15px rgba(0,0,0,0.5); }
[data-bs-theme="dark"] .btn-group .btn { border-color: #333; }
/* Karanlık temada menü butonunun hover arkaplanı biraz daha belirgin olsun */
[data-bs-theme="dark"] .navbar .btn[class*="btn-outline-"]:hover { background-color: rgba(255, 255, 255, 0.1) !important; }


/* =========================================
   AYDINLIK TEMA (LIGHT MODE) ÖZEL AYARLARI
========================================= */
[data-bs-theme="light"] body { background-color: #f5f5f5; color: #212529; }
[data-bs-theme="light"] .navbar { background-color: #ffffff !important; border-bottom: 1px solid #dee2e6; }
[data-bs-theme="light"] .navbar-brand { color: #d39e00 !important; }
[data-bs-theme="light"] .card { background-color: #ffffff; border-color: #dee2e6; box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,0.075); }
[data-bs-theme="light"] .card-ders:hover { border-color: #0dcaf0; box-shadow: 0 10px 20px rgba(13, 202, 240, 0.15) !important; }
[data-bs-theme="light"] .card-etut:hover { border-color: #198754; box-shadow: 0 10px 20px rgba(25, 135, 84, 0.15) !important; }
[data-bs-theme="light"] .table-dark th { background-color: #f1f3f5; color: #d39e00; border-bottom: 2px solid #dee2e6; }
[data-bs-theme="light"] .form-control { background-color: #ffffff; border-color: #ced4da; color: #212529; }
[data-bs-theme="light"] .date-row { background-color: rgba(255, 193, 7, 0.1) !important; border-top: 2px solid #dee2e6; }
[data-bs-theme="light"] .fixed-bottom-bar { background-color: #ffffff; border-top: 1px solid #dee2e6; box-shadow: 0 -5px 15px rgba(0,0,0,0.05); }
[data-bs-theme="light"] .btn-group .btn { border-color: #ced4da; }


/* =========================================
   ÖZEL BİLEŞENLER (İKİ TEMA İÇİN DE ORTAK)
========================================= */
.class-title { font-size: 1.4rem; font-weight: 700; letter-spacing: 0.5px; }
.status-icon { font-size: 1.2rem; }

/* Buton Grupları (Yoklama Ekranı) */
.btn-group { display: flex; width: 100%; border-radius: 8px; overflow: hidden; }
.btn-group .btn { flex: 1; padding: 12px 5px; font-weight: bold; border-radius: 0; }
.btn-outline-success { color: #198754; }
.btn-outline-danger { color: #dc3545; }
.btn-outline-warning { color: #ffc107; }
.btn-outline-secondary { color: #6c757d; }

.btn-check:checked + .btn-outline-success { background-color: #198754; color: #fff; border-color: #198754; }
.btn-check:checked + .btn-outline-danger { background-color: #dc3545; color: #fff; border-color: #dc3545; }
.btn-check:checked + .btn-outline-warning { background-color: #ffc107; color: #000; border-color: #ffc107; }
.btn-check:checked + .btn-outline-secondary { background-color: #6c757d; color: #fff; border-color: #6c757d; }

.fixed-bottom-bar { 
    position: fixed; 
    bottom: 0; 
    left: 0; 
    width: 100%; 
    padding: 15px 0; 
    z-index: 9999; /* Buton her zaman en üstte kalır */
}
.note-textarea { resize: none; font-size: 0.95rem; }

/* =========================================
   3'LÜ TEMA SWITCH (PILL) TASARIMI - GÜNCELLENDİ
========================================= */
.theme-switch-container {
    display: flex;
    align-items: center;
}
.theme-switch {
    border-radius: 50px;
    padding: 5px;
    transition: all 0.3s ease;
}
.theme-switch .btn {
    border-radius: 50px !important;
    padding: 6px 18px;
    color: var(--bs-secondary-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent; /* Geçişlerde titremeyi önler */
}
/* İkonların pasif durumu soluk görünür */
.theme-switch .btn i {
    opacity: 0.3;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.theme-switch .btn:hover {
    color: var(--bs-body-color);
}
.theme-switch .btn:hover i {
    opacity: 0.7;
}

/* --- SEÇİLİ DURUM (İkon parlak ve hafif büyük olur) --- */
.theme-switch .btn-check:checked + .btn i {
    opacity: 1;
    transform: scale(1.2);
}

/* =====================================
   AYDINLIK TEMA (LIGHT) ÖZEL GÖRÜNÜM
===================================== */
[data-bs-theme="light"] .theme-switch {
    background-color: #e9ecef; /* Yuva rengi */
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05); /* Yuva iç gölgesi */
    border: 1px solid #dee2e6;
}
[data-bs-theme="light"] .theme-switch .btn-check:checked + .btn {
    background-color: #ffffff; /* Buton dışarıda ve beyaz */
    color: #000;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border-color: #ced4da;
}

/* =====================================
   KARANLIK TEMA (DARK) ÖZEL GÖRÜNÜM
===================================== */
[data-bs-theme="dark"] .theme-switch {
    background-color: #0a0a0a; /* Yuva ZİFİRİ KARANLIK (İçeri gömülü hissi) */
    box-shadow: inset 0 3px 8px rgba(0,0,0,0.8);
    border: 1px solid #1a1a1a;
}
[data-bs-theme="dark"] .theme-switch .btn-check:checked + .btn {
    background-color: #2c2c2c; /* Seçili buton yuvadan DAHA AÇIK renk */
    color: #ffffff;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(0,0,0,0.9); /* Dışarı fırlamış gölge */
    border-color: #444; /* Butonun etrafında ince parlak çizgi */
}

/* =========================================
 *  ANA SAYFA (LANDING PAGE) ÖZEL STİLLERİ
 = *======================================== */
:root {
    --primary: #4f46e5;
    --primary-dark: #3730a3;
}
.btn-custom {
    background-color: var(--primary);
    color: #fff !important;
    font-weight: 700;
    padding: 10px 24px;
    border-radius: 50px;
    border: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}
.btn-custom:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
}

.hero {
    padding: 160px 0 100px;
    position: relative;
    overflow: hidden;
}
[data-bs-theme="light"] .hero { background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%); }
[data-bs-theme="dark"] .hero { background: var(--bs-body-bg); }

.hero::before {
    content: '';
    position: absolute;
    top: -20%; left: -10%; width: 50%; height: 50%;
    background: radial-gradient(circle, rgba(79,70,229,0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: -1;
}
[data-bs-theme="dark"] .hero::before { background: radial-gradient(circle, rgba(79,70,229,0.2) 0%, rgba(0,0,0,0) 70%); }
.hero h1 {
    font-weight: 800;
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: 24px;
}
.hero p {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--bs-secondary-color);
    margin-bottom: 40px;
    font-weight: 400;
}

.features { padding: 100px 0; background-color: var(--bs-tertiary-bg); }
.feature-card {
    padding: 40px 30px;
    border-radius: 24px;
    background-color: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    height: 100%;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}
[data-bs-theme="dark"] .feature-card:hover { box-shadow: 0 20px 40px rgba(0,0,0,0.5); }

.feature-icon {
    width: 65px; height: 65px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
    margin-bottom: 25px;
}

.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

/* --- ZORUNLU GÜNCELLEME EKRANI --- */
.update-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 99999; /* Her şeyin en üstünde */
    display: none; /* Başlangıçta gizli */
    align-items: center;
    justify-content: center;
}
.update-modal {
    background: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color-translucent);
    border-radius: 24px;
    width: 85%;
    max-width: 360px;
    padding: 40px 25px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
    animation: popIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.update-modal .update-icon {
    width: 80px; height: 80px;
    border-radius: 50%;
    background: rgba(13, 202, 240, 0.1);
    color: #0dcaf0;
    margin: 0 auto 20px auto;
    display: flex; align-items: center; justify-content: center;
    font-size: 2.5rem;
}
.update-modal .update-title { font-weight: 900; font-size: 1.4rem; margin-bottom: 10px; }
.update-modal .update-desc { font-size: 0.95rem; color: var(--bs-secondary-color); margin-bottom: 25px; line-height: 1.5; }

/* --- ÇEVRİMDIŞI (OFFLINE) UYARI ÇUBUĞU --- */
#offline-banner {
position: fixed;
top: -60px; /* Başlangıçta ekranın dışında gizli */
left: 50%;
transform: translateX(-50%);
background-color: #ff453a; /* Kırmızı uyarı rengi */
color: white;
padding: 12px 24px;
border-radius: 0 0 16px 16px;
font-size: 0.95rem;
font-weight: 700;
box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
z-index: 11000; /* Her şeyin üstünde (menüler dahil) görünmesi için yüksek z-index */
transition: top 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color 0.3s ease;
display: flex;
align-items: center;
gap: 10px;
pointer-events: none; /* Tıklamaları engellememesi için */
}

#offline-banner.show {
top: 0; /* Ekrana kayarak girer */
}

#offline-banner.online {
background-color: #34c759; /* İnternet gelince yeşile döner */
}

/* --- HEADER VE FOOTER'DAN TAŞINAN STILLER --- */
[data-bs-theme="dark"] .navbar-brand img { filter: invert(1) brightness(2); }

.nav-action-btn { display: flex; align-items: center; padding: 8px 14px; border-radius: 14px; text-decoration: none !important; color: var(--bs-body-color); font-weight: 700; transition: all 0.2s ease; margin-bottom: 5px; cursor: pointer; }
.nav-action-btn:hover { background-color: var(--bs-secondary-bg); color: var(--bs-body-color); }
.nav-icon-box { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: 10px; margin-right: 12px; font-size: 16px; flex-shrink: 0; }
.nav-action-btn.dropdown-toggle::after { margin-left: auto; border-top: .35em solid; border-right: .35em solid transparent; border-left: .35em solid transparent; }

.dropdown-item:hover, .dropdown-item:focus { background-color: var(--bs-secondary-bg); border-radius: 10px; }
.landing-btn { padding: 8px 15px !important; font-size: 0.95rem !important; transition: all 0.2s ease; }

@media (min-width: 1200px) {
    .nav-action-btn { margin-bottom: 0; margin-right: 8px; }
    .hide-text-xl { display: none !important; }
    .nav-action-btn.icon-only-xl { padding: 8px; }
    .nav-action-btn.icon-only-xl .nav-icon-box { margin-right: 0; }
    .landing-btn { width: 160px !important; }
}

.theme-switch-wrapper { background: var(--bs-secondary-bg); border-radius: 50px; padding: 4px; display: inline-flex; }
.theme-switch-wrapper .btn { border-radius: 50px !important; color: var(--bs-secondary-color); font-weight: 600; border: none; padding: 6px 18px; }
.theme-switch-wrapper .btn-check:checked + .btn { background: var(--bs-body-bg); color: var(--bs-body-color); box-shadow: 0 2px 8px rgba(0,0,0,0.1); }

@media (max-width: 1199.98px) {
    .navbar { position: sticky !important; top: 0; z-index: 1050; }
    #mainNavbar.show, #mainNavbar.collapsing {
    position: absolute; top: 100%; left: 15px; right: 15px;
    background: var(--bs-body-bg); border-radius: 20px;
    padding: 1.5rem; margin-top: 15px; box-shadow: 0 20px 50px rgba(0,0,0,0.15);
    border: 1px solid var(--bs-border-color-translucent); z-index: 1050; max-height: 85vh; overflow-y: auto;
    }
    [data-bs-theme="dark"] #mainNavbar.show, [data-bs-theme="dark"] #mainNavbar.collapsing { box-shadow: 0 20px 50px rgba(0,0,0,0.7); }
    #mainNavbar .btn-sm, .nav-action-btn { padding: 12px 16px !important; font-size: 1.05rem !important; border-radius: 14px !important; margin-bottom: 8px !important; background-color: var(--bs-tertiary-bg); display: flex; align-items: center; width: 100%; color: var(--bs-body-color) !important; }
    #mainNavbar .dropdown-menu { position: static !important; background: transparent !important; border: none !important; padding-left: 15px !important; box-shadow: none !important; margin-top: 0 !important; margin-bottom: 10px !important; }
    #mainNavbar .dropdown-item { padding: 10px 15px; border-radius: 10px; margin-bottom: 4px; font-size: 1rem; color: var(--bs-body-color); }
    .logout-btn-mobile { border-radius: 16px !important; padding: 14px !important; font-size: 1.1rem !important; width: 100%; margin-top: 10px; justify-content: center !important; }
    .theme-switch-container { display: flex; justify-content: center; width: 100%; margin: 15px 0; }
    .landing-btn { width: 100% !important; margin-bottom: 10px; }
}

.hover-primary { transition: color 0.3s; }
.hover-primary:hover { color: #0d6efd !important; }
[data-bs-theme="dark"] .footer-logo { filter: invert(1) brightness(2); }