/* ========================================
   DESIGN SYSTEM & ROOT VARIABLES
   ======================================== */
:root {
    /* Color Palette - Vibrant Crypto Theme */
    --color-primary: hsl(280, 85%, 60%);
    --color-primary-light: hsl(280, 85%, 70%);
    --color-primary-dark: hsl(280, 85%, 50%);

    --color-secondary: hsl(195, 100%, 50%);
    --color-secondary-light: hsl(195, 100%, 60%);

    --color-accent: hsl(45, 100%, 55%);
    --color-accent-light: hsl(45, 100%, 65%);

    --color-success: hsl(145, 70%, 50%);
    --color-warning: hsl(30, 100%, 55%);
    --color-danger: hsl(0, 85%, 60%);

    /* Neutral Colors - Dark Theme */
    --color-bg-primary: hsl(240, 20%, 8%);
    --color-bg-secondary: hsl(240, 15%, 12%);
    --color-bg-tertiary: hsl(240, 12%, 16%);
    --color-bg-card: hsla(240, 15%, 15%, 0.6);

    --color-text-primary: hsl(0, 0%, 98%);
    --color-text-secondary: hsl(0, 0%, 75%);
    --color-text-tertiary: hsl(0, 0%, 55%);

    --color-border: hsla(0, 0%, 100%, 0.1);
    --color-border-hover: hsla(0, 0%, 100%, 0.2);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Space Grotesk', var(--font-primary);

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

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(148, 0, 211, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 400ms ease-in-out;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

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

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

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

ul {
    list-style: none;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: hsla(240, 20%, 8%, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-base);
}

.navbar.scrolled {
    background: hsla(240, 20%, 8%, 0.95);
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-accent {
    color: var(--color-accent);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    position: relative;
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-base);
}

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
}

.menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, hsla(280, 85%, 60%, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, hsla(195, 100%, 50%, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, hsla(45, 100%, 55%, 0.1) 0%, transparent 50%);
    animation: gradientShift 15s ease-in-out infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto var(--spacing-3xl);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

/* User Counter */
.user-counter {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    background: var(--color-bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) auto;
    max-width: 600px;
    animation: fadeInUp 0.8s ease-out 0.3s backwards;
    transition: all var(--transition-base);
}

.user-counter:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.counter-icon {
    font-size: 3rem;
    filter: drop-shadow(0 0 10px rgba(148, 0, 211, 0.5));
}

.counter-content {
    text-align: left;
}

.counter-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.counter-label {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.4;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

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

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

.hero-stats {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.stat-card {
    background: var(--color-bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-base);
}

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

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

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

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.1));
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 4px 20px rgba(148, 0, 211, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(148, 0, 211, 0.5);
}

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

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

/* ========================================
   SECTIONS
   ======================================== */
.section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-alt {
    background: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
}

/* ========================================
   CARDS GRID
   ======================================== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.card {
    background: var(--color-bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

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

.card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
}

.card-info {
    flex: 1;
}

.card-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

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

.card-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.card-features {
    margin-bottom: var(--spacing-md);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.feature-item::before {
    content: '✓';
    color: var(--color-success);
    font-weight: 700;
    font-size: 1.1rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    padding: 0.35rem 0.75rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

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

.card-footer {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: auto;
}

.card-btn {
    flex: 1;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-base);
}

.card-btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
}

.card-btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 20px rgba(148, 0, 211, 0.4);
}

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

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

/* Badge for Active/Hot status */
.badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-hot {
    background: linear-gradient(135deg, var(--color-warning), var(--color-danger));
    color: white;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

.badge-new {
    background: linear-gradient(135deg, var(--color-success), hsl(145, 70%, 40%));
    color: white;
}

/* ========================================
   CATEGORY TABS
   ======================================== */
.category-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-weight: 600;
    transition: all var(--transition-base);
}

.tab-btn:hover,
.tab-btn.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-text {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.footer-text.small {
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* Social Links */
.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    overflow: hidden;
    position: relative;
}

.social-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.social-link:hover::before {
    opacity: 0.1;
}

.social-link:hover {
    border-color: var(--color-primary);
    color: var(--color-text-primary);
    transform: translateX(5px);
}

.social-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
    transition: all var(--transition-base);
}

.social-link:hover .social-icon {
    filter: drop-shadow(0 0 8px var(--color-primary));
    transform: scale(1.1);
}

.social-link span {
    position: relative;
    z-index: 1;
    font-weight: 500;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-tertiary);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg-secondary);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-150%);
        transition: transform var(--transition-base);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .menu-toggle {
        display: flex;
    }

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

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

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

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

    .category-tabs {
        font-size: 0.9rem;
    }

    .tab-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: auto;
        padding: var(--spacing-2xl) 0;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }
}