/* ===== CSS Variables & Reset ===== */
:root {
    /* Colors - Shady Beautiful Palette */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);

    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);

    --border-color: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(102, 126, 234, 0.3);

    --success: #10b981;
    --shadow-glow: 0 0 60px rgba(102, 126, 234, 0.15);

    /* Typography */
    --font-primary: 'Outfit', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;

    /* Spacing */
    --container-width: 1200px;
    --section-padding: 100px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
}

.logo-icon {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
}

.logo-text {
    color: var(--text-primary);
}

.logo-accent {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 120px 0 60px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(102, 126, 234, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(118, 75, 162, 0.1), transparent);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
}

.gradient-text {
    display: block;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ===== Upload Zone ===== */
.upload-zone {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 60px 40px;
    background: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: 24px;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    z-index: 1;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-glow);
}

.upload-content {
    text-align: center;
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: float 3s ease-in-out infinite;
}

.upload-icon svg {
    width: 36px;
    height: 36px;
    color: white;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.upload-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.upload-formats {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== Compression Panel ===== */
.compression-panel {
    display: none;
    padding: 40px 0 var(--section-padding);
}

.compression-panel.active {
    display: block;
}

.panel-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-glow);
}

.preview-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.preview-box {
    flex: 1;
    min-width: 200px;
    max-width: 350px;
    position: relative;
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.preview-label {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0, 0, 0, 0.6);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    z-index: 10;
}

.preview-box img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    background: rgba(0, 0, 0, 0.3);
}

.file-info {
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border-color);
}

.file-size {
    font-family: var(--font-display);
    font-weight: 600;
}

.savings {
    background: var(--success);
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.preview-arrow {
    font-size: 2rem;
    color: var(--accent-primary);
    font-weight: 300;
}

/* ===== Controls Title ===== */
.controls-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 32px;
    margin-top: 20px;
}

/* ===== Controls - Centered & Beautiful ===== */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.control-group {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px 28px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition-fast);
}

.control-group:hover {
    border-color: var(--border-accent);
    background: rgba(255, 255, 255, 0.04);
}

.control-label {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-label::before {
    content: '';
    width: 4px;
    height: 16px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 8px 0;
}

.slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 10px;
    background: linear-gradient(90deg, var(--accent-primary) 0%, var(--bg-card) 0%);
    border-radius: 10px;
    outline: none;
    transition: var(--transition-fast);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent-gradient);
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.5);
    transition: var(--transition-fast);
    border: 3px solid var(--bg-secondary);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.slider-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    min-width: 60px;
    text-align: center;
    padding: 8px 16px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    border: 1px solid var(--border-accent);
    border-radius: 10px;
}

.size-inputs {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.size-input-group {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    transition: var(--transition-fast);
}

.size-input-group:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.2);
}

.size-input {
    width: 100px;
    padding: 16px 18px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    outline: none;
    text-align: center;
}

.size-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.size-unit {
    padding-right: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.size-separator {
    color: var(--accent-primary);
    font-size: 1.3rem;
    font-weight: 300;
}

.aspect-ratio-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.95rem;
    user-select: none;
    padding: 12px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition-fast);
}

.aspect-ratio-toggle:hover {
    border-color: var(--accent-primary);
}

.aspect-ratio-toggle input {
    display: none;
}

.aspect-ratio-toggle .checkmark {
    font-size: 1.1rem;
    opacity: 0.4;
    transition: var(--transition-fast);
}

.aspect-ratio-toggle input:checked+.checkmark {
    opacity: 1;
    color: var(--accent-primary);
}

.aspect-ratio-toggle input:checked~span:last-child {
    color: var(--text-primary);
}

.format-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.format-btn {
    padding: 14px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 0.5px;
}

.format-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.format-btn.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* ===== Buttons ===== */
.actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 14px;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(102, 126, 234, 0.4);
}

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

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* ===== Features Section ===== */
.features {
    padding: var(--section-padding) 0;
    background: var(--bg-secondary);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 36px;
    text-align: center;
    transition: var(--transition-smooth);
}

.feature-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== About Section ===== */
.about {
    padding: var(--section-padding) 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 50px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== Footer ===== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        padding: 20px;
        flex-direction: column;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
    }

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

    .menu-toggle {
        display: flex;
    }

    .upload-zone {
        padding: 40px 24px;
    }

    .preview-area {
        flex-direction: column;
    }

    .preview-arrow {
        transform: rotate(90deg);
    }

    .preview-box {
        max-width: 100%;
    }

    .panel-card {
        padding: 24px;
    }

    .size-inputs {
        flex-direction: column;
        align-items: flex-start;
    }

    .size-input-group {
        width: 100%;
    }

    .size-input {
        width: 100%;
    }

    .about-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 14px 24px;
        font-size: 0.9rem;
    }

    .actions {
        flex-direction: column;
    }

    .actions .btn {
        width: 100%;
        justify-content: center;
    }
}