/* ============================================
   ZhiQu Future - Common Styles
   A modern, distinctive design system
   ============================================ */

/* CSS Variables - Theme Configuration */
:root {
    /* Primary Colors - Deep Ocean Theme */
    --color-primary: #0a2540;
    --color-primary-light: #1a3a5c;
    --color-primary-dark: #051525;
    
    /* Accent Colors - Vibrant Coral & Teal */
    --color-accent: #00d4aa;
    --color-accent-hover: #00f5c4;
    --color-accent-secondary: #ff6b6b;
    
    /* Neutral Colors */
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-text-muted: #a0aec0;
    --color-white: #ffffff;
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0a2540 0%, #1a3a5c 50%, #0d4f6e 100%);
    --gradient-accent: linear-gradient(135deg, #00d4aa 0%, #00b894 100%);
    --gradient-hero: linear-gradient(180deg, #0a2540 0%, #1a3a5c 60%, #0d5f7a 100%);
    --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    
    /* Typography */
    --font-primary: 'Plus Jakarta Sans', 'Segoe UI', system-ui, sans-serif;
    --font-display: 'Outfit', 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(0, 212, 170, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    margin-bottom: var(--space-4);
    color: var(--color-text-light);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-hover);
}

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-sm {
    max-width: 900px;
}

.container-lg {
    max-width: 1400px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 37, 64, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 37, 64, 0.98);
    box-shadow: var(--shadow-lg);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    padding: 0 var(--space-6);
    max-width: 1400px;
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-white);
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--color-accent);
}

.navbar-brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-accent);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--color-primary);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    list-style: none;
}

.navbar-nav a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

.navbar-nav a i {
    font-size: var(--text-lg);
}

/* Mobile Menu Toggle */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    background: transparent;
    border: none;
    cursor: pointer;
}

.navbar-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.navbar-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggle.active span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-primary);
    box-shadow: 0 4px 14px rgba(0, 212, 170, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 170, 0.5);
    color: var(--color-primary);
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
    color: var(--color-white);
}

.btn-outline {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn-outline:hover {
    background: var(--color-accent);
    color: var(--color-primary);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn i {
    font-size: 1.2em;
}

/* Google Play Button */
.btn-google-play {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
}

.btn-google-play:hover {
    background: var(--color-primary-light);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-google-play img {
    height: 24px;
    width: auto;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
    background: var(--gradient-primary);
}

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

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: var(--space-6);
}

.card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.card-text {
    color: var(--color-text-light);
    margin-bottom: var(--space-4);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--space-20) 0;
}

.section-sm {
    padding: var(--space-12) 0;
}

.section-lg {
    padding: var(--space-24) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-12);
}

.section-header h2 {
    margin-bottom: var(--space-4);
}

.section-header p {
    font-size: var(--text-lg);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(0, 212, 170, 0.1);
    color: var(--color-accent);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 170, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 180, 148, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 40% 40%, rgba(13, 95, 122, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(var(--text-4xl), 8vw, var(--text-6xl));
    color: var(--color-white);
    margin-bottom: var(--space-6);
    line-height: 1.1;
}

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

.hero-subtitle {
    font-size: var(--text-xl);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-8);
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

/* Floating Elements */
.hero-float {
    position: absolute;
    border-radius: var(--radius-2xl);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.hero-float-1 {
    width: 300px;
    height: 200px;
    top: 20%;
    right: 10%;
    animation-delay: 0s;
}

.hero-float-2 {
    width: 200px;
    height: 150px;
    bottom: 20%;
    right: 25%;
    animation-delay: 2s;
}

.hero-float-3 {
    width: 150px;
    height: 100px;
    top: 40%;
    right: 5%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-primary);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand {
    margin-bottom: var(--space-4);
}

.footer-brand-name {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.footer-brand-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 800;
    color: var(--color-primary);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--text-sm);
    line-height: 1.8;
}

.footer-title {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-4);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-3);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-accent);
    padding-left: var(--space-2);
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.footer-copyright {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-social {
    display: flex;
    gap: var(--space-3);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-lg);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-accent);
    color: var(--color-primary);
    transform: translateY(-3px);
}

/* ============================================
   Utilities
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-white { color: var(--color-white); }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }

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

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }

.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-float {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.5rem;
    }
    
    .navbar-nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--color-primary);
        padding: var(--space-4);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }
    
    .navbar-nav.active {
        transform: translateX(0);
    }
    
    .navbar-nav a {
        padding: var(--space-4);
        border-radius: var(--radius-md);
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .section {
        padding: var(--space-12) 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .btn-lg {
        width: 100%;
    }
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* Stagger animation delays */
[data-delay="100"] { transition-delay: 100ms; }
[data-delay="200"] { transition-delay: 200ms; }
[data-delay="300"] { transition-delay: 300ms; }
[data-delay="400"] { transition-delay: 400ms; }
[data-delay="500"] { transition-delay: 500ms; }
[data-delay="600"] { transition-delay: 600ms; }

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

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

::-webkit-scrollbar-thumb {
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

/* ============================================
   Selection Styling
   ============================================ */
::selection {
    background: var(--color-accent);
    color: var(--color-primary);
}

::-moz-selection {
    background: var(--color-accent);
    color: var(--color-primary);
}