/* ============================================
   Gaming PC Builder - Main Theme (Light Mode)
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Light Mode */
    --color-primary: #6366F1;
    --color-primary-dark: #4F46E5;
    --color-primary-light: #818CF8;
    --color-secondary: #8B5CF6;
    --color-accent: #EC4899;

    --color-bg: #FFFFFF;
    --color-bg-secondary: #F9FAFB;
    --color-bg-tertiary: #F3F4F6;

    --color-text: #111827;
    --color-text-secondary: #6B7280;
    --color-text-tertiary: #9CA3AF;

    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;

    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
    --gradient-secondary: linear-gradient(135deg, #EC4899 0%, #8B5CF6 100%);
    --gradient-hero: linear-gradient(180deg, #F9FAFB 0%, #FFFFFF 100%);

    /* 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);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;

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

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

button {
    font-family: var(--font-family);
    cursor: pointer;
    border: none;
    background: none;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* ============================================
   Container
   ============================================ */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
}

/* ============================================
   Header
   ============================================ */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    transition: var(--transition);
    height: 72px;
}

.header-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

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

/* Navigation */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 0.5rem 0;
    position: relative;
}

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

.nav-menu a:hover {
    color: var(--color-primary);
}

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

/* Header Controls */
.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-switcher,
.language-switcher {
    position: relative;
}

.theme-btn,
.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    background-color: var(--color-bg-tertiary);
}

.theme-btn:hover,
.lang-btn:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
}

/* Theme Dropdown */
.theme-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
}

.theme-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-option {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    color: var(--color-text);
    text-align: left;
}

.theme-option:hover {
    background-color: var(--color-bg-tertiary);
}

.theme-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
}

.theme-dot.light {
    background: linear-gradient(135deg, #FFFFFF 0%, #F3F4F6 100%);
}

.theme-dot.dark {
    background: linear-gradient(135deg, #1F2937 0%, #111827 100%);
}

.theme-dot.tokyo {
    background: linear-gradient(135deg, #00D9FF 0%, #9D4EDD 50%, #FF6B9D 100%);
}

.theme-dot.seoul {
    background: linear-gradient(135deg, #C85943 0%, #2C7A7B 50%, #D69545 100%);
}

.theme-dot.neon {
    background: linear-gradient(135deg, #FFD700 0%, #9D4EDD 50%, #FF006E 100%);
}

/* Login Button */
.login-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.375rem;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    z-index: 999;
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: var(--transition);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-nav ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.mobile-nav a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    padding: 0.75rem 0;
    display: block;
    border-bottom: 1px solid var(--color-border-light);
}

.mobile-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-theme-options h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.mobile-theme-option {
    padding: 0.75rem;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--color-text);
}

.mobile-theme-option:hover {
    background-color: var(--color-bg-secondary);
}

.mobile-login-btn {
    display: block;
    text-align: center;
    padding: 1rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
}

@media (max-width: 968px) {
    .main-nav,
    .header-controls .theme-switcher,
    .header-controls .language-switcher,
    .header-controls .login-btn {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    margin-top: 72px;
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
    position: relative;
    padding: 0;
    background: var(--gradient-hero);
    overflow: hidden;
    margin-top: -72px;
    padding-top: 72px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem 0;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

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

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

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

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

.hero-stats {
    display: flex;
    gap: 3rem;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

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

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 500px;
}

.hero-image-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-card {
    position: absolute;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: float 3s ease-in-out infinite;
}

.floating-card.card-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.floating-card.card-2 {
    top: 50%;
    right: 10%;
    animation-delay: 1s;
}

.floating-card.card-3 {
    bottom: 10%;
    left: 20%;
    animation-delay: 2s;
}

.card-icon {
    font-size: 2rem;
}

.card-text {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-text);
}

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

.hero-gradient {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background: var(--gradient-primary);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.2;
}

.hero-bg-gradient {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg) 100%);
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        font-size: 1.125rem;
    }

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

    .hero-visual {
        height: 300px;
    }

    .hero-stats {
        gap: 2rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

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

/* ============================================
   Section Styles
   ============================================ */

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

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }

    .section-description {
        font-size: 1rem;
    }
}

/* ============================================
   Features Section
   ============================================ */

.features-section {
    padding: 6rem 0;
    background-color: var(--color-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-light);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    color: white;
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

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

@media (max-width: 968px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Apps Section
   ============================================ */

.apps-section {
    padding: 6rem 0;
    background-color: var(--color-bg-secondary);
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.app-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-light);
}

.app-card-inner {
    padding: 2rem;
}

.app-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    color: white;
    margin-bottom: 1.5rem;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.app-description {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.app-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    font-weight: 600;
}

.app-link:hover {
    gap: 0.75rem;
}

@media (max-width: 968px) {
    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .apps-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
    position: relative;
    padding: 6rem 0;
    background: var(--gradient-primary);
    overflow: hidden;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.cta-title {
    font-size: 3rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.cta-buttons .btn-primary {
    background-color: white;
    color: var(--color-primary);
}

.cta-buttons .btn-outline {
    border-color: white;
    color: white;
}

.cta-buttons .btn-outline:hover {
    background-color: white;
    color: var(--color-primary);
}

.cta-bg-gradient {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
}

@media (max-width: 768px) {
    .cta-title {
        font-size: 2rem;
    }

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

/* ============================================
   Footer
   ============================================ */

.main-footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr) 1.5fr;
    gap: 3rem;
    padding: 4rem 0;
    border-bottom: 1px solid var(--color-border);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.footer-description {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: white;
}

.footer-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

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

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

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

.footer-contact-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-contact-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.footer-contact-list svg {
    color: var(--color-primary);
}

/* Footer Newsletter */
.footer-newsletter {
    padding: 3rem 0;
    border-bottom: 1px solid var(--color-border);
}

.newsletter-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.newsletter-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.newsletter-text p {
    color: var(--color-text-secondary);
}

.newsletter-form {
    display: flex;
    gap: 1rem;
    flex: 1;
    max-width: 500px;
}

.newsletter-form input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background-color: var(--color-bg);
    color: var(--color-text);
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* Footer Bottom */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem 0;
}

.copyright {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

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

.footer-lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

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

@media (max-width: 1200px) {
    .footer-top {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-contact {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .footer-top {
        grid-template-columns: 1fr;
    }

    .newsletter-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .newsletter-form {
        width: 100%;
        max-width: 100%;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

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