:root {
    --font-primary: 'Inter', 'Segoe UI Variable Display', 'Segoe UI', system-ui, sans-serif;
    --color-primary: 59, 130, 246;
    --color-primary-dark: 37, 99, 235;
    --color-secondary: 255, 165, 0;
    --color-secondary-dark: 255, 140, 0;
    --color-orange: var(--color-secondary);
    /* Backwards compat */

    /* Light mode colors */
    --bg-primary: #f3f3f3;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.7);
    --text-primary: #18181b;
    --text-secondary: #71717a;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow: rgba(0, 0, 0, 0.1);
}

.dark {
    --bg-primary: #202020;
    --bg-secondary: #2c2c2c;
    --bg-card: rgba(44, 44, 44, 0.7);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --border-color: rgba(255, 255, 255, 0.05);
    --shadow: rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 1200px;
    z-index: 1000;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0.75rem 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    line-height: 1;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: rgb(var(--color-primary));
    transition: width 0.3s ease;
}

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

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.6rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--text-primary);
}

.theme-toggle:hover {
    background: rgba(var(--color-primary), 0.1);
    border-color: rgb(var(--color-primary));
}

.dark .sun-icon {
    display: none;
}

.moon-icon {
    display: none;
}

.dark .moon-icon {
    display: block;
}

.dark .sun-icon {
    display: block;
}

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

.hero-background {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(var(--color-primary), 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.1) 0px, transparent 50%);
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

.hero-content {
    max-width: 900px;
    text-align: center;
    position: relative;
    z-index: 10;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: rgb(var(--color-primary));
    border-radius: 50%;
    animation: pulse 2s ease infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.6s ease 0.1s backwards;
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 4rem;
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, rgb(var(--color-primary)) 0%, rgb(var(--color-primary-dark)) 100%);
    color: white;
    box-shadow: 0 4px 20px rgba(var(--color-primary), 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(var(--color-primary), 0.5);
}

.btn-secondary {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-large {
    padding: 1.125rem 2rem;
    font-size: 1.125rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    padding: 2rem;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, rgb(var(--color-primary)) 0%, rgb(var(--color-secondary)) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.stat-divider {
    width: 1px;
    background: var(--border-color);
}

/* Features Section */
.features {
    padding: 6rem 2rem;
    position: relative;
}

.section-container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px var(--shadow);
    border-color: rgba(var(--color-primary), 0.3);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: white;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, rgb(var(--color-primary)) 0%, rgb(var(--color-primary-dark)) 100%) !important;
}

.bg-gradient-secondary {
    background: linear-gradient(135deg, rgb(var(--color-secondary)) 0%, rgb(var(--color-secondary-dark)) 100%) !important;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* About Section */
.about {
    padding: 6rem 2rem;
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 4rem;
    align-items: center;
}

.about-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
}

.about-feature svg {
    color: rgb(var(--color-primary));
    flex-shrink: 0;
}

.about-image {
    position: relative;
}

.image-placeholder {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 20px 60px var(--shadow);
}

.placeholder-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.placeholder-item {
    aspect-ratio: 1;
    background: linear-gradient(135deg, rgba(var(--color-primary), 0.2) 0%, rgba(var(--color-secondary), 0.2) 100%);
    border-radius: 16px;
    animation: shimmer 2s ease infinite;
}

.placeholder-item:nth-child(1) {
    animation-delay: 0s;
}

.placeholder-item:nth-child(2) {
    animation-delay: 0.2s;
}

.placeholder-item:nth-child(3) {
    animation-delay: 0.4s;
}

.placeholder-item:nth-child(4) {
    animation-delay: 0.6s;
}

@keyframes shimmer {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

/* Download Section */
.download {
    padding: 6rem 2rem;
}

.download-card {
    background: linear-gradient(135deg, rgb(var(--color-primary)) 0%, rgb(var(--color-secondary)) 100%);
    border-radius: 32px;
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

.download-content {
    position: relative;
    z-index: 10;
    max-width: 700px;
    margin: 0 auto;
}

.download-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}

.download-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.download-card .btn-primary {
    background: white;
    color: rgb(var(--color-primary));
}

.download-card .btn-primary:hover {
    background: rgba(255, 255, 255, 0.95);
}

.download-card .btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.download-card .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.download-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    font-size: 0.875rem;
}

.info-item svg {
    flex-shrink: 0;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 2rem 2rem;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-description {
    color: var(--text-secondary);
    max-width: 300px;
}

.footer-heading {
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: rgb(var(--color-primary));
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

    .hero-stats {
        gap: 1.5rem;
        flex-direction: column;
    }

    .stat-divider {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .download-card {
        padding: 3rem 1.5rem;
    }

    .download-buttons {
        flex-direction: column;
    }

    .download-info {
        flex-direction: column;
        gap: 0.75rem;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(var(--color-primary), 0.5);
}

/* Theme Customization Panel */
.theme-panel {
    position: fixed;
    top: 5rem;
    right: 2rem;
    width: 300px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 1.5rem;
    z-index: 1001;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.theme-panel.active {
    transform: translateX(0);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.panel-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.close-panel {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.close-panel:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.control-group {
    margin-bottom: 1.25rem;
}

.control-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

input[type="color"] {
    width: 100%;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2px;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: border-color 0.2s;
}

input[type="color"]:hover {
    border-color: rgb(var(--color-primary));
}

/* Checkbox Style */
.checkbox-container {
    display: flex !important;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    height: 20px;
    width: 20px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    transition: all 0.2s ease;
}

.checkbox-container:hover input~.checkmark {
    border-color: rgb(var(--color-primary));
}

.checkbox-container input:checked~.checkmark {
    background-color: rgb(var(--color-primary));
    border-color: rgb(var(--color-primary));
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked~.checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 7px;
    top: 3px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Theme Mode Switch */
.theme-mode-switch {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
}

.mode-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 6px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-btn:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.05);
}

.mode-btn.active {
    background: var(--bg-card);
    color: rgb(var(--color-primary));
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .theme-panel {
        width: 100%;
        top: auto;
        bottom: 0;
        right: 0;
        left: 0;
        border-radius: 20px 20px 0 0;
        transform: translateY(100%);
    }

    .theme-panel.active {
        transform: translateY(0);
    }
}