/* ==================== CSS Reset & Variables ==================== */
:root {
    /* Colors */
    --color-primary: #D4AF37;
    --color-primary-light: #F4E4A6;
    --color-primary-dark: #B8941F;
    --color-bg-primary: #0A0A0A;
    --color-bg-secondary: #1A1A1A;
    --color-bg-card: rgba(26, 26, 26, 0.6);
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #CCCCCC;
    --color-text-muted: #999999;
    --color-accent: #FF6B6B;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #D4AF37 0%, #F4E4A6 100%);
    --gradient-radial: radial-gradient(circle at 50% 50%, rgba(212, 175, 55, 0.15) 0%, transparent 70%);
    --gradient-mesh: radial-gradient(at 27% 37%, hsla(215, 98%, 61%, 0.1) 0px, transparent 50%),
                     radial-gradient(at 97% 21%, hsla(125, 98%, 72%, 0.1) 0px, transparent 50%),
                     radial-gradient(at 52% 99%, hsla(354, 98%, 61%, 0.1) 0px, transparent 50%),
                     radial-gradient(at 10% 29%, hsla(256, 96%, 67%, 0.1) 0px, transparent 50%);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    --space-4xl: 8rem;

    /* Typography */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;

    /* Border */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 30px rgba(212, 175, 55, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Z-index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-tooltip: 600;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ==================== Utilities ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ==================== Background Decoration ==================== */
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.4) 0%, transparent 70%);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.3) 0%, transparent 70%);
    top: 40%;
    right: -10%;
    animation-delay: 7s;
}

.orb-3 {
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.2) 0%, transparent 70%);
    bottom: -20%;
    left: 30%;
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-30px, 30px) scale(0.9);
    }
}

/* ==================== Navigation ==================== */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
}

.logo-wrapper {
    height: 40px;
    transition: transform var(--transition-base);
}

.logo-wrapper:hover {
    transform: scale(1.05);
}

.logo-image {
    height: 100%;
    width: auto;
    filter: drop-shadow(0 2px 8px rgba(212, 175, 55, 0.3));
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background: rgba(255, 255, 255, 0.05);
    padding: var(--space-xs);
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-btn {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    position: relative;
}

.lang-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.lang-btn span {
    position: relative;
    z-index: 1;
}

.lang-btn:hover {
    color: var(--color-text-primary);
}

.lang-btn.active {
    color: var(--color-bg-primary);
}

.lang-btn.active::before {
    opacity: 1;
}

.lang-divider {
    width: 1px;
    height: 16px;
    background: rgba(255, 255, 255, 0.2);
}

/* ==================== Hero Section ==================== */
.hero {
    position: relative;
    padding: var(--space-4xl) 0 var(--space-3xl);
    z-index: var(--z-base);
}

.hero-content {
    text-align: center;
    margin-bottom: var(--space-3xl);
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.title-highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: var(--font-size-6xl);
    letter-spacing: -0.02em;
    filter: drop-shadow(0 0 30px rgba(212, 175, 55, 0.3));
}

.title-main {
    font-size: var(--font-size-4xl);
    color: var(--color-text-primary);
    font-weight: 700;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
    font-weight: 300;
}

/* ==================== App Showcase ==================== */
.app-showcase {
    position: relative;
    margin: var(--space-3xl) auto;
    perspective: 2000px;
}

.showcase-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    padding: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.phone-frame {
    position: relative;
    border-radius: var(--radius-xl);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    padding: 12px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-2xl);
    transition: all var(--transition-slow);
    animation: fadeInUp 0.8s ease-out both;
}

.phone-frame[data-index="0"] { animation-delay: 0.1s; }
.phone-frame[data-index="1"] { animation-delay: 0.2s; }
.phone-frame[data-index="2"] { animation-delay: 0.3s; }
.phone-frame[data-index="3"] { animation-delay: 0.4s; }

.phone-frame:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 30px 60px rgba(212, 175, 55, 0.2);
    border-color: rgba(212, 175, 55, 0.3);
}

.phone-screen {
    position: relative;
    border-radius: calc(var(--radius-xl) - 4px);
    overflow: hidden;
    background: #000;
    aspect-ratio: 9 / 19.5;
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.phone-frame:hover .phone-screen img {
    transform: scale(1.05);
}

/* ==================== Features Section ==================== */
.features {
    position: relative;
    padding: var(--space-4xl) 0;
    z-index: var(--z-base);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.feature-card {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    transition: all var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(212, 175, 55, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3),
                0 0 0 1px rgba(212, 175, 55, 0.1);
}

.feature-card-wide {
    grid-column: 1 / -1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    color: var(--color-bg-primary);
    box-shadow: var(--shadow-glow);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    line-height: 1.3;
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.8;
    font-weight: 300;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.feature-item {
    display: flex;
    gap: var(--space-md);
}

.feature-bullet {
    width: 6px;
    height: 6px;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin-top: 8px;
    flex-shrink: 0;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
}

.feature-subtitle {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.feature-item p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-weight: 300;
}

/* ==================== CTA Section ==================== */
.cta {
    position: relative;
    padding: var(--space-4xl) 0;
    z-index: var(--z-base);
}

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

.cta-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2xl);
    line-height: 1.2;
    filter: drop-shadow(0 0 20px rgba(212, 175, 55, 0.2));
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-xl);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.download-btn:hover::before {
    opacity: 1;
}

.download-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.3);
    border-color: var(--color-primary);
}

.download-btn:active {
    transform: translateY(-2px);
}

.download-icon {
    width: 32px;
    height: 32px;
    position: relative;
    z-index: 1;
    transition: transform var(--transition-base);
}

.download-btn:hover .download-icon {
    transform: scale(1.1);
}

.download-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: relative;
    z-index: 1;
}

.download-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: 400;
    transition: color var(--transition-base);
}

.download-store {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    transition: color var(--transition-base);
}

.download-btn:hover .download-label,
.download-btn:hover .download-store {
    color: var(--color-bg-primary);
}

/* ==================== Footer ==================== */
.footer {
    position: relative;
    padding: var(--space-2xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: var(--space-4xl);
    z-index: var(--z-base);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.footer-link {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
}

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

.footer-divider {
    color: var(--color-text-muted);
}

/* ==================== Scroll to Top Button ==================== */
.scroll-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
    color: var(--color-bg-primary);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.4);
}

.scroll-top svg {
    width: 24px;
    height: 24px;
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-slow);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== Responsive Design ==================== */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --font-size-6xl: 3rem;
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

    .showcase-container {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }

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

/* Mobile */
@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --space-3xl: 3rem;
        --space-4xl: 4rem;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .nav-content {
        padding: var(--space-sm) 0;
    }

    .logo-wrapper {
        height: 32px;
    }

    .hero {
        padding: var(--space-3xl) 0 var(--space-xl);
    }

    .hero-title {
        gap: var(--space-xs);
    }

    .title-highlight {
        font-size: var(--font-size-5xl);
    }

    .title-main {
        font-size: var(--font-size-3xl);
    }

    .hero-description {
        font-size: var(--font-size-base);
    }

    .showcase-container {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
        padding: var(--space-sm);
    }

    .feature-card {
        padding: var(--space-lg);
    }

    .feature-title {
        font-size: var(--font-size-xl);
    }

    .cta-title {
        font-size: var(--font-size-3xl);
    }

    .download-buttons {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-md);
    }

    .download-btn {
        justify-content: center;
    }

    .footer-content {
        gap: var(--space-sm);
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .scroll-top {
        bottom: var(--space-lg);
        right: var(--space-lg);
        width: 44px;
        height: 44px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-6xl: 2rem;
        --font-size-5xl: 1.75rem;
        --font-size-4xl: 1.5rem;
    }

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

    .phone-frame {
        max-width: 280px;
        margin: 0 auto;
    }
}

/* ==================== Accessibility ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* ==================== Print Styles ==================== */
@media print {
    .navbar,
    .scroll-top,
    .download-buttons {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}

/* ==================== Dark Mode Support (Future) ==================== */
@media (prefers-color-scheme: light) {
    /* Light mode overrides can be added here if needed */
}