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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --border-light: #475569;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 35px 60px -15px rgba(0, 0, 0, 0.6);
    --glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #cbd5e1;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 35px 60px -15px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

/* Navbar */
.navbar {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.9);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}

.pro-badge {
    font-size: 0.6rem;
    background: linear-gradient(135deg, var(--warning), #f97316);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-weight: 700;
    vertical-align: super;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-links a.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.15);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-menu {
    position: relative;
}

.user-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.user-btn:hover {
    border-color: var(--primary);
}

.dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.5rem;
    min-width: 180px;
    display: none;
    box-shadow: var(--shadow-lg);
}

.dropdown.show {
    display: block;
}

.dropdown a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.dropdown a:hover {
    background: var(--bg-tertiary);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.2) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 20% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(99, 102, 241, 0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(139, 92, 246, 0.3), transparent),
        radial-gradient(2px 2px at 50px 160px, rgba(6, 182, 212, 0.3), transparent),
        radial-gradient(2px 2px at 90px 40px, rgba(99, 102, 241, 0.3), transparent),
        radial-gradient(2px 2px at 130px 80px, rgba(139, 92, 246, 0.3), transparent),
        radial-gradient(2px 2px at 160px 120px, rgba(6, 182, 212, 0.3), transparent);
    background-size: 200px 200px;
    animation: particleFloat 60s linear infinite;
}

@keyframes particleFloat {
    0% { transform: translateY(0); }
    100% { transform: translateY(-200px); }
}

.hero-content {
    max-width: 900px;
    width: 100%;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50px;
    color: var(--primary-light);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero > .hero-content > p {
    color: var(--text-secondary);
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* Shorten Box */
.shorten-box {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.shorten-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.25rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
    width: fit-content;
}

.tab {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.tab.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-group {
    display: flex;
    gap: 1rem;
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.input-wrapper input {
    width: 100%;
    padding: 1.25rem 1.25rem 1.25rem 3rem;
    font-size: 1.1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 14px;
    color: var(--text-primary);
    transition: all 0.3s;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.btn-primary {
    padding: 1.25rem 2rem;
    font-size: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 14px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s;
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px -10px var(--primary);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-glow {
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.4);
}

.btn-glow:hover {
    box-shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.6);
}

.bulk-input {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bulk-input textarea {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    resize: vertical;
}

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

/* Options Toggle */
.options-toggle {
    margin-top: 1.5rem;
    padding: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 12px;
    transition: all 0.2s;
}

.options-toggle:hover {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.options-toggle .fa-chevron-down {
    transition: transform 0.3s;
}

.options-toggle.active .fa-chevron-down {
    transform: rotate(180deg);
}

/* Advanced Options */
.advanced-options {
    display: none;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.advanced-options.show {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.option-group {
    text-align: left;
}

.option-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

.option-group input,
.option-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    transition: all 0.2s;
}

.option-group input:focus,
.option-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.custom-input {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.custom-input .prefix {
    padding: 0.75rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.2);
    font-size: 0.85rem;
    white-space: nowrap;
}

.custom-input input {
    border: none !important;
    background: transparent !important;
}

.utm-section, .og-section {
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
    margin-bottom: 1rem;
}

.utm-section h4, .og-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* Result Box */
.result-box {
    margin-top: 1.5rem;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--success);
    border-radius: 16px;
    overflow: hidden;
}

.result-header {
    padding: 1rem 1.5rem;
    background: rgba(34, 197, 94, 0.15);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--success);
    font-weight: 600;
}

.result-content {
    padding: 1.5rem;
}

.result-url-wrapper {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.result-url-wrapper input {
    flex: 1;
    padding: 1rem 1.25rem;
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--success);
}

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

.btn-copy, .btn-qr, .btn-share, .btn-stats {
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-copy {
    background: var(--success);
    color: white;
}

.btn-copy:hover {
    background: #16a34a;
}

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

.btn-qr:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

.btn-share:hover {
    border-color: var(--accent);
    color: var(--accent);
}

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

.btn-stats:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

.result-meta {
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.1);
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    gap: 1.5rem;
}

/* Stats Section */
.stats-section {
    padding: 4rem 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.stats-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.stat-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.stat-info {
    flex: 1;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Features Section */
.features-section {
    padding: 6rem 2rem;
    background: var(--bg-primary);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px -15px rgba(99, 102, 241, 0.3);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    font-size: 1.5rem;
    color: var(--primary);
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    font-weight: 700;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 20px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-lg {
    max-width: 700px;
}

.close-modal {
    float: right;
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: all 0.2s;
}

.close-modal:hover {
    background: var(--error);
    color: white;
}

/* QR Customizer */
.qr-customizer {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.qr-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 12px;
    padding: 1rem;
}

.qr-preview img {
    max-width: 100%;
    border-radius: 8px;
}

.qr-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Share Buttons */
.share-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.share-btn {
    padding: 1rem;
    border-radius: 12px;
    text-align: center;
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: transform 0.2s;
}

.share-btn:hover {
    transform: translateY(-2px);
}

.share-btn.twitter { background: #1da1f2; }
.share-btn.facebook { background: #1877f2; }
.share-btn.linkedin { background: #0077b5; }
.share-btn.whatsapp { background: #25d366; }
.share-btn.telegram { background: #0088cc; }
.share-btn.email { background: var(--bg-tertiary); color: var(--text-primary); }

/* Footer */
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem 2rem;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 1rem;
    font-size: 0.95rem;
}

.footer-links h4 {
    margin-bottom: 1rem;
    font-weight: 700;
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.35rem 0;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
    
    .qr-customizer {
        grid-template-columns: 1fr;
    }
    
    .share-options {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
    }
    
    .result-actions {
        flex-wrap: wrap;
    }
}