/* ============================================
   DILDENT Katılımcı Başvuru Sistemi
   Light Theme (GSGILS 2026 Style)
   ============================================ */

/* --- CSS Variables --- */
:root {
    --bg-main: #FFFFFF;
    --bg-alt: #F8FAFC;
    --bg-card: #FFFFFF;
    --text-main: #0F172A;
    --text-muted: #475569;
    
    --primary: #0284C7;
    --primary-dark: #0369A1;
    --primary-light: #38BDF8;
    
    --accent: #0284C7;
    --accent-light: #38BDF8;
    
    --gradient-primary: linear-gradient(135deg, #0284C7, #38BDF8);
    --gradient-btn: linear-gradient(135deg, #0284C7, #0369A1);
    --gradient-text: linear-gradient(135deg, #0284C7, #38BDF8);
    
    --border-subtle: rgba(0, 0, 0, 0.1);
    --border-color: rgba(0, 0, 0, 0.15);
    --bg-input: #FFFFFF;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #0284C7;
    --nav-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-alt);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Deadline Banner --- */
.deadline-banner {
    background: var(--primary);
    color: #fff;
    text-align: center;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    z-index: 1100;
}
.deadline-banner i { margin-right: 8px; }

/* --- Navbar --- */
.navbar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-main);
    text-decoration: none;
}
.nav-brand img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    padding: 100px 0 80px;
    text-align: center;
    background: var(--bg-main);
    border-bottom: 1px solid var(--border-subtle);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100vw;
    background: radial-gradient(circle, rgba(2, 132, 199, 0.05) 0%, transparent 60%);
    z-index: 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(2, 132, 199, 0.1);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(2, 132, 199, 0.2);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1.1;
    margin-bottom: 24px;
    font-weight: 800;
    color: var(--text-main);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.6;
}

.hero-date {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 40px;
}

.hero-date i { color: var(--primary); }

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-btn);
    color: #fff;
    box-shadow: 0 4px 15px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(2, 132, 199, 0.4);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1.5px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(2, 132, 199, 0.05);
}

/* --- Features Section --- */
.section {
    padding: 80px 0;
    background: var(--bg-main);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-alt);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(2, 132, 199, 0.3);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: rgba(2, 132, 199, 0.1);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--primary);
    color: #fff;
}

.feature-card h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-main);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.section-divider {
    border: none;
    height: 1px;
    background: var(--border-subtle);
    margin: 0;
}

/* --- Form Section --- */
.form-section {
    padding: 100px 0;
    background: var(--bg-alt);
}

.form-wrapper {
    background: var(--bg-main);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.form-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.form-header {
    text-align: center;
    margin-bottom: 40px;
}

.form-header h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--text-main);
}

.form-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

.required {
    color: var(--danger);
    font-weight: bold;
}

/* --- Info Boxes --- */
.info-box {
    background: rgba(2, 132, 199, 0.05);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 16px 20px;
    margin-bottom: 24px;
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.info-box i {
    color: var(--primary);
    font-size: 1.4rem;
    margin-top: 2px;
}

.info-box p {
    color: var(--text-main);
    font-size: 0.95rem;
    line-height: 1.6;
}

.travel-info {
    background: rgba(59, 130, 246, 0.05);
    border-left-color: var(--info);
}

.travel-info i {
    color: var(--info);
}

/* --- Form Grid --- */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.full-width {
    grid-column: 1 / -1;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    margin-bottom: 8px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group label i {
    color: var(--primary);
    opacity: 0.8;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #9CA3AF;
}

/* Custom Select */
.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23475569' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
    cursor: pointer;
}

/* Error States */
.error-text {
    color: var(--danger);
    font-size: 0.8rem;
    margin-top: 6px;
    display: none;
}
.error-text.visible { display: block; animation: fadeIn 0.3s ease; }

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--danger);
}
.form-group input.error:focus,
.form-group select.error:focus,
.form-group textarea.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Checkbox Groups */
.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}
.checkbox-group:hover { border-color: var(--primary); }

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    cursor: pointer;
    accent-color: var(--primary);
}

.cb-label {
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.5;
}

/* --- Submit Area --- */
.form-actions {
    margin-top: 40px;
    display: flex;
    justify-content: center;
}
.btn-submit {
    width: 100%;
    max-width: 400px;
    padding: 16px;
    font-size: 1.1rem;
    border-radius: var(--radius-lg);
}

/* Spinner */
.spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.btn.loading .btn-text { display: none; }
.btn.loading .spinner { display: block; }
.btn.loading { opacity: 0.8; cursor: not-allowed; }

/* --- Modals & Overlays --- */
.message-overlay, .modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.message-overlay.show, .modal-overlay.show { display: flex; animation: fadeIn 0.3s ease; }

.message-card, .modal-content {
    background: var(--bg-main);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 500px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: scaleIn 0.3s ease;
}

.modal-content { text-align: left; max-width: 700px; max-height: 85vh; overflow-y: auto; }
.modal-content h3 { font-family: var(--font-heading); margin-bottom: 20px; color: var(--text-main); font-size: 1.5rem; }
.modal-content p { color: var(--text-muted); margin-bottom: 12px; font-size: 0.95rem; }

.message-card .icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto 24px;
}
.message-card.success .icon { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.message-card.error .icon { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.message-card h3 { font-family: var(--font-heading); font-size: 1.8rem; margin-bottom: 16px; color: var(--text-main); }
.message-card p { color: var(--text-muted); margin-bottom: 32px; font-size: 1.05rem; }

/* --- Scroll Top --- */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--bg-main);
    color: var(--text-main);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}
.scroll-top.visible { opacity: 1; visibility: visible; }
.scroll-top:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-3px); }

/* --- Footer --- */
.footer {
    background: #0F172A;
    color: #94A3B8;
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 30px;
}
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.footer-brand img { height: 40px; width: auto; filter: brightness(0) invert(1); }
.footer-text { font-family: var(--font-heading); font-weight: 500; font-size: 1.1rem; color: #F8FAFC; }

.footer-links {
    display: flex;
    gap: 24px;
}
.footer-links a {
    color: #94A3B8;
    text-decoration: none;
    font-weight: 500;
}
.footer-links a:hover { color: #fff; }

.footer-eu {
    display: flex;
    align-items: center;
    gap: 24px;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-eu img { height: 50px; width: auto; }
.footer-eu p { font-size: 0.85rem; max-width: 600px; line-height: 1.6; }

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { transform: scale(0.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 992px) {
    .form-wrapper { padding: 32px 24px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero { padding: 60px 0; }
    .hero-title { font-size: 2.2rem; }
    .form-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; }
    .footer-inner { flex-direction: column; align-items: flex-start; }
    .footer-eu { flex-direction: column; align-items: flex-start; }
}