/* ===== CSS Reset & Variables ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #f8f9fa;
    --text: #1a1a2e;
    --primary: #e94560;
    --secondary: #0f3460;
    --accent: #16213e;
    --glass: rgba(255,255,255,0.7);
    --shadow: 0 8px 32px rgba(0,0,0,0.1);
    --gradient-banner: linear-gradient(135deg, #0f3460, #16213e);
    --radius-card: 20px;
    --radius-btn: 30px;
    --transition: 0.3s ease;
    --font: system-ui, -apple-system, sans-serif;
}

body.dark {
    --bg: #0f0f1a;
    --text: #e0e0e0;
    --glass: rgba(0,0,0,0.6);
    --shadow: 0 8px 32px rgba(0,0,0,0.5);
    --gradient-banner: linear-gradient(135deg, #0a0a14, #1a1a2e);
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
}

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

a:hover {
    color: #d63350;
}

img, svg {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Layout ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header ===== */
header {
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    padding: 8px 12px;
    border-radius: 8px;
    transition: background var(--transition), color var(--transition);
    font-weight: 500;
}

.nav-links a:hover {
    background: var(--primary);
    color: #fff;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text);
    padding: 4px 8px;
    border-radius: 8px;
    transition: background var(--transition);
}

.menu-toggle:hover {
    background: rgba(233,69,96,0.1);
}

.dark-toggle {
    background: none;
    border: 1px solid var(--text);
    border-radius: 20px;
    padding: 5px 15px;
    cursor: pointer;
    color: var(--text);
    font-size: 1rem;
    transition: all var(--transition);
}

.dark-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* ===== Hero Banner ===== */
.banner {
    position: relative;
    overflow: hidden;
    height: 70vh;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--gradient-banner);
    color: #fff;
}

.banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 50%, rgba(233,69,96,0.15) 0%, transparent 60%),
                radial-gradient(circle at 80% 50%, rgba(15,52,96,0.3) 0%, transparent 60%);
    pointer-events: none;
}

.banner-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.8s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.banner-slide.active {
    opacity: 1;
}

.banner h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    animation: fadeInUp 0.8s ease;
}

.banner p {
    font-size: 1.2rem;
    max-width: 600px;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease 0.2s both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Glass Card ===== */
.glass-card {
    background: var(--glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-card);
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.2);
    transition: transform var(--transition), box-shadow var(--transition);
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

/* ===== Grids ===== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--radius-btn);
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(233,69,96,0.3);
    color: #fff;
}

/* ===== Stats ===== */
.stat-item {
    text-align: center;
    padding: 20px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary);
    line-height: 1.2;
}

/* ===== FAQ ===== */
.faq-item {
    border-bottom: 1px solid rgba(128,128,128,0.2);
    padding: 15px 0;
    cursor: pointer;
    transition: background var(--transition);
}

.faq-item:hover {
    background: rgba(233,69,96,0.03);
}

.faq-question {
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.05rem;
}

.faq-question span {
    font-size: 1.5rem;
    transition: transform var(--transition);
    color: var(--primary);
}

.faq-item.open .faq-question span {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 20px;
    color: var(--text);
    opacity: 0.8;
}

.faq-item.open .faq-answer {
    max-height: 200px;
    padding: 15px 20px 5px;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary);
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition), transform var(--transition);
    border: none;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(233,69,96,0.3);
    z-index: 99;
}

.back-to-top.show {
    opacity: 1;
}

.back-to-top:hover {
    transform: scale(1.1);
}

/* ===== Footer ===== */
footer {
    background: var(--accent);
    color: #fff;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.footer-grid a {
    color: #ccc;
    display: block;
    margin: 5px 0;
    transition: color var(--transition);
}

.footer-grid a:hover {
    color: var(--primary);
}

.footer-grid h4 {
    margin-bottom: 10px;
    color: #fff;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 15px 0;
    font-size: 0.9rem;
    color: #666;
}

.breadcrumb a {
    color: var(--primary);
}

/* ===== Search Bar ===== */
.search-bar {
    display: flex;
    gap: 10px;
    max-width: 400px;
    margin: 20px auto;
}

.search-bar input {
    flex: 1;
    padding: 10px 15px;
    border-radius: var(--radius-btn);
    border: 1px solid #ccc;
    background: var(--glass);
    color: var(--text);
    transition: border-color var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary);
}

.search-bar button {
    padding: 10px 20px;
    border-radius: var(--radius-btn);
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background var(--transition);
}

.search-bar button:hover {
    background: #d63350;
}

/* ===== Card ===== */
.card {
    background: var(--glass);
    border-radius: var(--radius-card);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid rgba(255,255,255,0.1);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}

/* ===== Tag ===== */
.tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary);
    color: #fff;
    border-radius: 20px;
    font-size: 0.8rem;
    margin: 5px;
    font-weight: 500;
}

/* ===== Avatar ===== */
.avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    margin: 0 auto 10px;
    font-size: 1.2rem;
    box-shadow: 0 4px 10px rgba(233,69,96,0.2);
}

/* ===== SVG Icon ===== */
.svg-icon {
    width: 40px;
    height: 40px;
    fill: var(--primary);
    margin: 0 auto 15px;
    display: block;
}

/* ===== Scroll Animation ===== */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Section Spacing ===== */
section {
    padding: 80px 0;
}

/* ===== Form Inputs ===== */
input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 10px;
    border: 1px solid #ccc;
    background: var(--bg);
    color: var(--text);
    transition: border-color var(--transition);
    font-family: var(--font);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
}

/* ===== Prev/Next Navigation ===== */
.container[style*="display:flex"] a {
    padding: 8px 16px;
    border-radius: 8px;
    transition: background var(--transition);
}

.container[style*="display:flex"] a:hover {
    background: rgba(233,69,96,0.1);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        background: var(--glass);
        backdrop-filter: blur(12px);
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        padding: 20px;
        box-shadow: var(--shadow);
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav-links.open {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .banner h1 {
        font-size: 2rem;
    }

    .banner p {
        font-size: 1rem;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .banner {
        height: 50vh;
        min-height: 300px;
    }

    section {
        padding: 50px 0;
    }

    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .banner h1 {
        font-size: 1.6rem;
    }

    .btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }
}

/* ===== Dark Mode Adjustments ===== */
body.dark .glass-card,
body.dark .card {
    border-color: rgba(255,255,255,0.05);
}

body.dark .faq-item {
    border-color: rgba(255,255,255,0.1);
}

body.dark input,
body.dark textarea {
    border-color: #444;
    background: rgba(255,255,255,0.05);
}

body.dark .breadcrumb {
    color: #aaa;
}

body.dark .search-bar input {
    border-color: #444;
}

/* ===== Section Title ===== */
section h2 {
    font-size: 2rem;
    color: var(--text);
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
}

section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary);
    margin: 10px auto 0;
    border-radius: 2px;
}

/* ===== Article Cards ===== */
article.card h3,
article.card h4 {
    margin-bottom: 10px;
    color: var(--text);
}

article.card a {
    font-weight: 600;
}

/* ===== Aside Sections ===== */
aside {
    padding: 40px 0;
}

aside h3 {
    color: var(--text);
    margin-bottom: 20px;
}

aside a {
    display: block;
    padding: 4px 0;
    color: var(--text);
    opacity: 0.8;
    transition: opacity var(--transition);
}

aside a:hover {
    opacity: 1;
    color: var(--primary);
}

/* ===== Footer Bottom ===== */
footer .text-center p {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ===== Smooth Scrolling ===== */
html {
    scroll-behavior: smooth;
}

/* ===== Selection ===== */
::selection {
    background: var(--primary);
    color: #fff;
}