/* CSS Reset & Variables */
:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-red: #ef4444;
    --accent-green: #10b981;
    --accent-blue: #0ea5e9;
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(30, 41, 59, 0.7);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 600;
    color: var(--text-main);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

/* Navigation Container */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
}

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

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: 6rem 2rem;
    text-align: center;
    background: radial-gradient(circle at top, #1e293b 0%, #0f172a 100%);
    border-bottom: 1px solid var(--glass-border);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    letter-spacing: -0.05em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-action {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    flex: 1;
}

.btn-action:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    flex: 1;
}

.btn-outline:hover {
    background-color: rgba(59, 130, 246, 0.1);
}

.btn-full {
    width: 100%;
}

/* File Structure Section */
.file-section {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.section-title {
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.section-title p {
    color: var(--text-muted);
}

.alert-box {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-left: 4px solid var(--accent-red);
    padding: 1rem 1.5rem;
    border-radius: 6px;
    margin-bottom: 3rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.alert-box strong {
    color: var(--text-main);
}

.category-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.category-block h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-main);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* File Cards */
.file-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.file-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.pdf-icon {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
}

.img-icon {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
}

.docx-icon {
    background: rgba(14, 165, 233, 0.15);
    color: var(--accent-blue);
}

.card-info {
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.card-info h4 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.card-actions {
    display: flex;
    gap: 0.75rem;
}

/* Generic Sections */
.about-section, .contact-section {
    max-width: 1200px;
    margin: 0 auto 5rem;
    padding: 0 2rem;
}

.about-content h2, .contact-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.about-content p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    max-width: 800px;
}

.contact-box {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    margin-top: 2rem;
}

.contact-box p {
    margin-bottom: 0.75rem;
    color: var(--text-muted);
}

.contact-box strong {
    color: var(--text-main);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple hidden menu on mobile for now */
    }

    .hero h2 {
        font-size: 2.5rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}