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

/* THEME VARIABLES */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-header-footer: rgba(255, 255, 255, 0.95);
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --btn-primary-bg: #3b82f6;
    --btn-primary-hover: #2563eb;
    --btn-outline-border: #cbd5e1;
    --btn-outline-hover-bg: #f1f5f9;
    --gradient-start: #3b82f6;
    --gradient-end: #8b5cf6;
    --modal-bg: #ffffff;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-primary: #0a0e1a;
    --bg-secondary: #0f172a;
    --bg-header-footer: rgba(10, 14, 26, 0.95);
    --text-primary: #eef2ff;
    --text-secondary: #cbd5e1;
    --border-color: #1e293b;
    --card-bg: #111827;
    --btn-primary-bg: #3b82f6;
    --btn-primary-hover: #60a5fa;
    --btn-outline-border: #334155;
    --btn-outline-hover-bg: #1e293b;
    --gradient-start: #60a5fa;
    --gradient-end: #a78bfa;
    --modal-bg: #1e293b;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease;
}

button {
    cursor: pointer;
    font-family: inherit;
}

a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: color 0.2s;
}

a:hover {
    color: var(--btn-primary-bg);
}

/* HEADER STYLES */
header {
    background: var(--bg-header-footer);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 2rem;
}

.header-container {
    max-width: 1300px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.logo-icon i {
    font-size: 24px;
    color: white;
}

.logo-text h1 {
    font-size: 1.7rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(120deg, var(--text-primary), var(--gradient-end));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.beta-badge {
    font-size: 0.7rem;
    background: var(--btn-primary-bg);
    color: white;
    padding: 2px 8px;
    border-radius: 20px;
    font-weight: 500;
    margin-left: 6px;
}

/* BUTTONS */
.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.btn-primary {
    background: var(--btn-primary-bg);
    color: white;
}

.btn-primary:hover {
    background: var(--btn-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(59, 130, 246, 0.4);
}

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

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

.btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1rem;
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* HERO SECTION */
.hero {
    max-width: 1300px;
    margin: 4rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.pill {
    background: var(--btn-outline-hover-bg);
    padding: 0.3rem 1rem;
    border-radius: 40px;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-block;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.hero-content h2 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.2rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.trust-badge {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* STORAGE PREVIEW */
.storage-preview {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.storage-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.storage-bar {
    background: var(--btn-outline-hover-bg);
    border-radius: 20px;
    height: 8px;
    overflow: hidden;
    margin: 1rem 0;
}

.storage-fill {
    width: 32%;
    height: 100%;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 20px;
    animation: slideIn 0.5s ease;
}

.file-list {
    margin-top: 1rem;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.file-item i {
    color: var(--btn-primary-bg);
    width: 24px;
}

@keyframes slideIn {
    from { width: 0; }
    to { width: 32%; }
}

/* FEATURES */
.features {
    max-width: 1300px;
    margin: 2rem auto 4rem;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.5;
}

/* FOOTER */
footer {
    background: var(--bg-header-footer);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
}

.footer-container {
    max-width: 1300px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon.mini {
    width: 32px;
    height: 32px;
    border-radius: 10px;
}

.logo-icon.mini i {
    font-size: 18px;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.theme-toggle {
    background: var(--btn-outline-hover-bg);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    gap: 8px;
    font-size: 1.2rem;
}

.theme-toggle .fa-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: inline-block;
}

/* MODAL */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--modal-bg);
    border-radius: 32px;
    max-width: 450px;
    width: 90%;
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

.modal-header i {
    font-size: 1.8rem;
    color: var(--btn-primary-bg);
}

.modal-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-secondary);
    position: absolute;
    right: 1.5rem;
    top: 1.2rem;
}

.modal-body {
    padding: 1.5rem;
    text-align: center;
}

.modal-icon-animation {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: pulse 1.5s infinite;
}

.modal-body p {
    margin-bottom: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
}

.beta-note {
    background: var(--btn-outline-hover-bg);
    border-radius: 16px;
    padding: 1rem;
    margin: 1.5rem 0;
    display: flex;
    gap: 10px;
    align-items: center;
    text-align: left;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.modal-ok {
    width: 100%;
    justify-content: center;
    margin-top: 0.5rem;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h2 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .trust-badge {
        justify-content: center;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    
    .header-container {
        flex-direction: column;
    }
}