/* Study Maxxing - Landing Page Styles */
:root {
    /* Base Colors (Light Mode) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-soft: #eef2ff;
    --border-color: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --card-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.03), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Dark Mode overrides */
        --bg-primary: #020617;
        --bg-secondary: #0f172a;
        --text-primary: #f8fafc;
        --text-secondary: #94a3b8;
        --accent: #6366f1;
        --accent-hover: #818cf8;
        --accent-soft: rgba(99, 102, 241, 0.15);
        --border-color: #1e293b;
        --glass-bg: rgba(15, 23, 42, 0.7);
        --glass-border: rgba(30, 41, 59, 0.5);
        --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
        --card-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Typography */
h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent) 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background-color: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 800;
    font-size: 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background-color: var(--accent);
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 6rem 0 8rem;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, var(--accent-soft) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--accent-soft);
    color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

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

.hero p {
    font-size: 1.25rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 16px;
    font-weight: 700;
    font-size: 1.125rem;
    text-decoration: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-primary);
    transform: translateY(-2px);
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 4rem 0;
}

.feature-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 24px;
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: var(--accent-soft);
    color: var(--accent);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1.5rem;
}

.modal {
    background-color: var(--bg-secondary);
    width: 100%;
    max-width: 440px;
    border-radius: 32px;
    padding: 2.5rem;
    position: relative;
    box-shadow: var(--shadow);
    animation: slideUp 0.4s ease-out;
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border-radius: 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-input:focus {
    border-color: var(--accent);
}

/* Animations */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: slideUp 0.6s ease-out forwards;
}

/* Helper classes */
.hidden { display: none !important; }

/* Media Queries */
@media (max-width: 768px) {
    h1 { font-size: 3rem; }
    .hero { padding: 4rem 0 6rem; }
    .feature-card { padding: 2rem; }
}