/* ==========================================
   Global Styles - AutoSaline
   Light, airy, modern design system
   ========================================== */

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

:root {
    /* Color System - Light & Airy */
    --color-bg-primary: #FAFBFC;
    --color-bg-secondary: #F5F7FA;
    --color-bg-accent: #EFF6FF;
    
    --color-primary: #60A5FA;
    --color-primary-light: #93C5FD;
    --color-primary-dark: #3B82F6;
    
    --color-secondary: #67E8F9;
    --color-accent: #5EEAD4;
    
    --color-text-primary: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-light: #94A3B8;
    
    --color-white: #FFFFFF;
    --color-border: #E2E8F0;
    --color-shadow: rgba(148, 163, 184, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #60A5FA 0%, #67E8F9 100%);
    --gradient-secondary: linear-gradient(135deg, #93C5FD 0%, #5EEAD4 100%);
    --gradient-soft: linear-gradient(180deg, #FAFBFC 0%, #EFF6FF 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Borders & Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* Shadows - Soft & Light */
    --shadow-sm: 0 2px 8px var(--color-shadow);
    --shadow-md: 0 4px 16px var(--color-shadow);
    --shadow-lg: 0 8px 32px rgba(148, 163, 184, 0.15);
    --shadow-xl: 0 16px 48px rgba(148, 163, 184, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

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

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Section Spacing */
section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

/* ==========================================
   Navigation Bar
   ========================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 251, 252, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(250, 251, 252, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    position: relative;
    transition: var(--transition-base);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-bg-accent);
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.lang-switch {
    padding: 0.5rem 1rem;
    border: 2px solid var(--color-border);
    background: var(--color-white);
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: var(--transition-base);
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-bg-accent);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

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

/* ==========================================
   Buttons
   ========================================== */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: 0 4px 16px rgba(96, 165, 250, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(96, 165, 250, 0.4);
}

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

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

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

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

/* ==========================================
   Section Headers
   ========================================== */

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-label {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-bg-accent);
    color: var(--color-primary);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-description {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
}

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

/* ==========================================
   Cards
   ========================================== */

.card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    border: 1px solid var(--color-border);
}

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

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

.footer {
    background: var(--gradient-soft);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-brand h3 {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.footer-column a {
    display: block;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
    transition: var(--transition-base);
}

.footer-column a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.95);
    }
}

.fade-in-up {
    animation: fadeInUp 1s ease forwards;
}

.fade-in {
    animation: fadeIn 1s ease forwards;
}

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

@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-sm);
        text-align: left;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 4rem;
        --spacing-lg: 3rem;
    }
    
    .nav-container {
        height: 70px;
    }
    
    section {
        padding: var(--spacing-lg) 0;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* ==========================================
   Utility Classes
   ========================================== */

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

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

.bg-gradient {
    background: var(--gradient-soft);
}