/* Base Variables */
:root {
    /* Colors */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-accent: #f43f5e;
    --color-accent-light: #fb7185;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Background Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-elevated: #1e293b;
    
    /* Border & Shadow */
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

/* Header & Navigation */
.site-header {
    background: var(--bg-secondary);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0.5rem;
    transition: var(--transition-normal);
}

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

.nav-link--primary {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
}

.nav-link--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-normal);
    border: none;
    cursor: pointer;
    background: var(--color-primary);
    color: white;
}

.button:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

.button--primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    box-shadow: var(--shadow-md);
}

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

/* Messages */
.alert {
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    margin: var(--spacing-md) 0;
    border: 1px solid var(--border-color);
}

.alert--error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert--info {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.2);
    color: #93c5fd;
}

/* Mobile Navigation */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 32px;
    height: 24px;
    cursor: pointer;
    z-index: 1000;
    padding: 4px;
    background: transparent;
    border: none;
    transition: var(--transition-normal);
}

.hamburger:hover {
    transform: scale(1.1);
}

.hamburger__line {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 4px;
    transition: var(--transition-normal);
    transform-origin: center;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.hamburger:hover .hamburger__line {
    background: var(--color-primary);
}

.hamburger.is-active .hamburger__line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
    background: var(--color-primary);
}

.hamburger.is-active .hamburger__line:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.hamburger.is-active .hamburger__line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
    background: var(--color-primary);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-secondary);
    padding: 6rem 2rem 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
    border-left: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.mobile-nav.is-active {
    right: 0;
}

.mobile-nav__links {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.mobile-nav__link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 1rem 1.25rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav__link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(4px);
    border-color: var(--color-primary);
}

.mobile-nav__link--primary {
    background: var(--color-primary);
    color: white;
    text-align: center;
    justify-content: center;
    margin-top: 1rem;
    border: none;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.mobile-nav__link--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.overlay.is-active {
    display: block;
    opacity: 1;
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav {
        display: none;
    }

    .mobile-nav {
        display: block;
    }
}

@media (max-width: 640px) {
    .nav {
        display: none;
    }
}