/* ============================================
   Dr. Osman Er Academy — Main Stylesheet
   ============================================ */

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

/* --- CSS Variables --- */
:root {
    --bg-primary: #05112b;
    --bg-secondary: #111628;
    --bg-card: #1a1f35;
    --bg-card-hover: #232848;
    --accent-gold: #c8a45a;
    --accent-gold-light: #e0c67a;
    --accent-blue: #3a7bd5;
    --text-white: #ffffff;
    --text-light: #c5c9d6;
    --text-muted: #8a8fa3;
    --border-color: rgba(255,255,255,0.08);
    --glass-bg: rgba(26, 31, 53, 0.7);
    --glass-border: rgba(255,255,255,0.1);
    --shadow-lg: 0 25px 50px rgba(0,0,0,0.4);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    --font-display: 'Outfit', sans-serif;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-gold); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-gold-light); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* --- Header / Navbar --- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 18px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(180deg, rgba(10,14,26,0.95) 0%, rgba(10,14,26,0.6) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}
.navbar.scrolled {
    padding: 12px 40px;
    background: rgba(10,14,26,0.98);
}
.navbar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.navbar-logo img {
    height: 42px;
    width: auto;
}
.navbar-logo .logo-text {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--text-white);
    text-transform: uppercase;
    line-height: 1.2;
}
.navbar-logo .logo-text span {
    display: block;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 5px;
    color: var(--accent-gold);
}
.navbar-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}
.navbar-menu a {
    color: var(--text-light);
    font-size: 0.88rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    position: relative;
    padding: 4px 0;
}
.navbar-menu a::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 0;
    width: 0; height: 2px;
    background: var(--accent-gold);
    transition: width 0.3s ease;
}
.navbar-menu a:hover { color: var(--text-white); }
.navbar-menu a:hover::after { width: 100%; }
.navbar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}
.btn-auth {
    padding: 10px 24px;
    border: 1px solid var(--accent-gold);
    border-radius: var(--radius-xl);
    color: var(--accent-gold);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: var(--transition);
    background: transparent;
    cursor: pointer;
}
.btn-auth:hover {
    background: var(--accent-gold);
    color: var(--bg-primary);
}
.lang-switch {
    display: flex;
    gap: 4px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-xl);
    padding: 3px;
}
.lang-switch a {
    padding: 5px 12px;
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: var(--transition);
}
.lang-switch a.active {
    background: var(--accent-gold);
    color: var(--bg-primary);
}
.lang-switch a:hover { color: var(--text-white); }

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}
.menu-toggle span {
    width: 24px; height: 2px;
    background: var(--text-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Hero Slider --- */
.hero-slider {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}
.slide {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    align-items: center;
}
.slide.active { opacity: 1; z-index: 1; }
.slide-bg {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    background-color: var(--bg-secondary);
}
.slide-bg::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(10,14,26,0.85) 0%, rgba(10,14,26,0.4) 50%, rgba(10,14,26,0.7) 100%);
}
.slide-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    padding: 0 60px;
    animation: slideUp 0.8s ease forwards;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}
.slide-content .subtitle {
    font-family: var(--font-heading);
    font-style: italic;
    font-size: 2.2rem;
    color: var(--accent-gold);
    margin-bottom: 12px;
}
.slide-content h1 {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: 20px;
    text-transform: uppercase;
}
.slide-content p {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.7;
    max-width: 520px;
}

/* Slider dots */
.slider-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    gap: 10px;
}
.slider-dots .dot {
    width: 12px; height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}
.slider-dots .dot.active {
    background: var(--accent-gold);
    transform: scale(1.2);
}

/* Decorative sparkle */
.sparkle {
    position: absolute;
    right: 80px;
    bottom: 100px;
    z-index: 5;
    font-size: 4rem;
    color: var(--accent-gold);
    opacity: 0.3;
    animation: sparkleFloat 3s ease-in-out infinite;
}
@keyframes sparkleFloat {
    0%, 100% { transform: translateY(0) rotate(0); opacity: 0.3; }
    50% { transform: translateY(-15px) rotate(10deg); opacity: 0.6; }
}

/* --- Video Boxes + Training Date Section --- */
.video-date-section {
    padding: 0 40px;
    margin-top: -80px;
    position: relative;
    z-index: 10;
}
.video-date-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}
.video-box {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 9/14;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}
.video-box:hover {
    transform: translateY(-5px);
    border-color: var(--accent-gold);
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}
.video-box video,
.video-box img {
    width: 100%; height: 100%;
    object-fit: cover;
}
.video-box .play-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.3);
    opacity: 0;
    transition: var(--transition);
}
.video-box:hover .play-overlay { opacity: 1; }
.play-overlay .play-btn {
    width: 60px; height: 60px;
    border-radius: 50%;
    background: var(--accent-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-size: 1.5rem;
}
.training-date-box {
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--accent-gold);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(200,164,90,0.1);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 28px 24px;
    aspect-ratio: 9/14;
    overflow: hidden;
}
.training-date-box .label {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 16px;
    text-align: center;
    flex-shrink: 0;
}
/* Scrollable trainings list inside third box */
.trainings-scroll-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-gold) transparent;
    padding-right: 4px;
}
.trainings-scroll-list::-webkit-scrollbar { width: 4px; }
.trainings-scroll-list::-webkit-scrollbar-thumb { background: var(--accent-gold); border-radius: 4px; }
.trainings-scroll-list::-webkit-scrollbar-track { background: transparent; }
.training-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    transition: var(--transition);
}
.training-list-item:hover {
    border-color: rgba(200,164,90,0.3);
    background: rgba(200,164,90,0.05);
}
.training-list-info {
    flex: 1;
    min-width: 0;
}
.training-list-title {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.training-list-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.tl-badge {
    font-size: 0.65rem;
    padding: 2px 7px;
    border-radius: 20px;
    font-weight: 600;
    letter-spacing: 0.3px;
}
.tl-past {
    background: rgba(220,53,69,0.15);
    color: #ff6b6b;
    border: 1px solid rgba(220,53,69,0.25);
}
.tl-upcoming {
    background: rgba(40,167,69,0.15);
    color: #51cf66;
    border: 1px solid rgba(40,167,69,0.25);
}
.training-list-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: #25D366;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 20px;
    white-space: nowrap;
    text-decoration: none;
    flex-shrink: 0;
    transition: var(--transition);
}
.training-list-btn:hover {
    background: #1ebe5b;
    color: #fff;
    transform: scale(1.05);
}
.training-date-box .decorative-line {
    width: 60px;
    height: 2px;
    background: var(--accent-gold);
    margin: 20px auto 0;
}

/* --- Section Common --- */
.section {
    padding: 100px 40px;
    max-width: 1300px;
    margin: 0 auto;
}
.section-title {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.section-title .accent { color: var(--accent-gold); }
.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Why Section --- */
.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.why-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 40px 28px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.why-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    opacity: 0;
    transition: var(--transition);
}
.why-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-gold);
    box-shadow: var(--shadow-lg);
}
.why-card:hover::before { opacity: 1; }
.why-card .icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: block;
}
.why-card h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-white);
}
.why-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- Sponsors Section --- */
.sponsors-section {
    background: var(--bg-secondary);
    padding: 60px 40px;
    overflow: hidden;
}
.sponsors-marquee-container {
    width: 100%;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
    padding: 20px 0;
    max-width: 1200px;
    margin: 0 auto;
}
.sponsors-marquee-container::before,
.sponsors-marquee-container::after {
    content: "";
    position: absolute;
    top: 0;
    width: 150px;
    height: 100%;
    z-index: 2;
}
.sponsors-marquee-container::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-secondary) 0%, transparent 100%);
}
.sponsors-marquee-container::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-secondary) 0%, transparent 100%);
}
.sponsors-marquee {
    display: inline-flex;
    align-items: center;
    gap: 80px;
    padding-left: 80px;
    animation: marquee 30s linear infinite;
}
.sponsors-marquee:hover {
    animation-play-state: paused;
}
.sponsor-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 80px;
    min-width: 150px;
    filter: grayscale(100%) opacity(0.7);
    transition: var(--transition);
}
.sponsor-item:hover {
    filter: grayscale(0%) opacity(1);
    transform: scale(1.05);
}
.sponsor-item img {
    max-height: 100%;
    max-width: 200px;
    object-fit: contain;
}
.sponsor-placeholder {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-muted);
}
@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(-50% - 40px)); } /* 40px is half the gap to maintain perfect loop */
}

/* --- Footer --- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 40px 30px;
}
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 2px;
}
.footer-brand .logo-text span {
    display: block;
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 5px;
    color: var(--accent-gold);
}
.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 12px;
    line-height: 1.6;
}
.footer-links h4,
.footer-contact h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--accent-gold);
    letter-spacing: 1px;
    text-transform: uppercase;
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: var(--transition);
}
.footer-links a:hover { color: var(--accent-gold); padding-left: 4px; }
.footer-contact p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}
.footer-contact .social-links {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}
.footer-contact .social-links a {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}
.footer-contact .social-links a:hover {
    background: var(--accent-gold);
    color: var(--bg-primary);
    border-color: var(--accent-gold);
}
.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* --- Auth pages --- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 40px;
    background: var(--bg-primary);
}
.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
}
.auth-card h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    text-align: center;
}
.auth-card .auth-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 32px;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-light);
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-white);
    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(--accent-gold);
    box-shadow: 0 0 0 3px rgba(200,164,90,0.15);
}
.form-group input::placeholder { color: var(--text-muted); }
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--accent-gold);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
}
.btn-primary:hover {
    background: var(--accent-gold-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(200,164,90,0.3);
}
.auth-link {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}
.auth-link a { color: var(--accent-gold); font-weight: 600; }

/* Alert messages */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 0.9rem;
}
.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
}
.alert-error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

/* --- Scroll Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .machines-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr 1fr; }
    .slide-content h1 { font-size: 2.5rem; }
}
@media (max-width: 768px) {
    .navbar { padding: 14px 20px; }
    .navbar-menu {
        display: none;
        position: fixed;
        top: 0; left: 0;
        width: 100%; height: 100vh;
        background: rgba(10, 14, 26, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 24px;
        z-index: 999;
    }
    .navbar-menu.open { display: flex; }
    .navbar-menu a { font-size: 1.2rem; }
    .menu-toggle { display: flex; }
    .hero-slider { height: 80vh; }
    .slide-content { padding: 0 24px; }
    .slide-content h1 { font-size: 2rem; }
    .video-date-section { padding: 0 20px; margin-top: -40px; }
    .video-date-grid { grid-template-columns: 1fr; gap: 16px; }
    .video-box { aspect-ratio: 16/9; }
    .training-date-box { aspect-ratio: auto; padding: 40px 20px; }
    .section { padding: 60px 20px; }
    .section-title { font-size: 2rem; }
    .why-grid { grid-template-columns: 1fr; }
    .machines-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .sparkle { display: none; }
    .training-date-box .date-value { font-size: 2rem; }
}