/* ============================================
   Plus Jakarta Sans - Google Fonts
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@200;300;400;500;600;700;800&display=swap');

/* ============================================
   CSS Variables - Monochrome Theme
   ============================================ */
:root {
    /* Colors - Pure Monochrome */
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-gray-50: #F5F5F5;
    --color-gray-100: #E5E5E5;
    --color-gray-200: #CCCCCC;
    --color-gray-300: #B3B3B3;
    --color-gray-400: #999999;
    --color-gray-500: #808080;
    --color-gray-600: #666666;
    --color-gray-700: #4D4D4D;
    --color-gray-800: #333333;
    --color-gray-900: #1A1A1A;
    
    /* Semantic Colors */
    --color-bg: var(--color-white);
    --color-bg-alt: var(--color-gray-50);
    --color-text: var(--color-black);
    --color-text-muted: var(--color-gray-600);
    --color-border: var(--color-gray-200);
    --color-border-dark: var(--color-gray-800);
    --color-primary-red: #961128;
    --color-primary-red-dark: #7a0e20;
    
    /* Typography */
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Borders - Square corners */
    --border-radius: 0;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    flex: 1;
}

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

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

a:hover {
    opacity: 0.7;
}

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

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

p {
    margin-bottom: var(--spacing-md);
}

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

.container-sm {
    max-width: 640px;
}

.container-md {
    max-width: 768px;
}

.container-lg {
    max-width: 1024px;
}

/* ============================================
   Components - Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 600;
    border: 2px solid var(--color-black);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    cursor: pointer;
    -webkit-user-drag: none;
    user-drag: none;
}

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

.btn-primary:hover {
    background-color: var(--color-gray-800);
    opacity: 1;
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-black);
}

.btn-secondary:hover {
    background-color: var(--color-gray-100);
    opacity: 1;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ============================================
   Components - Cards
   ============================================ */
.card {
    background-color: var(--color-bg);
    border: 2px solid var(--color-black);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    color: var(--color-text);
}

.card h2, .card h3, .card h4, .card p {
    color: var(--color-text) !important;
}

.card .text-muted {
    color: var(--color-text-muted) !important;
}

.card-hover {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: 4px 4px 0 var(--color-black);
}

/* ============================================
   Components - Forms
   ============================================ */
.input {
    width: 100%;
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    border: 2px solid var(--color-black);
    border-radius: var(--border-radius);
    background-color: var(--color-white);
    transition: border-color var(--transition-fast);
}

.input:focus {
    outline: none;
    border-color: var(--color-gray-600);
}

.input::placeholder {
    color: var(--color-gray-400);
}

.label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Components - Hero
   ============================================ */
.hero {
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

/* ============================================
   Components - Social Login Buttons
   ============================================ */
.social-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    border: 2px solid var(--color-black);
    border-radius: var(--border-radius);
    background-color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.social-btn:hover {
    background-color: var(--color-gray-100);
    transform: translateY(-1px);
}

.social-btn:active {
    transform: translateY(0);
}

.social-btn svg {
    width: 24px;
    height: 24px;
}

.social-btn-google svg {
    color: #4285F4;
}

.social-btn-github svg {
    color: #333333;
}

.social-btn-microsoft svg {
    color: #00A4EF;
}

/* ============================================
   Components - Status Badge
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--color-black);
}

.badge-success {
    background-color: var(--color-black);
    color: var(--color-white);
}

.badge-neutral {
    background-color: var(--color-white);
    color: var(--color-black);
}

.badge-pending {
    background-color: var(--color-gray-200);
    color: var(--color-black);
}

/* ============================================
   Components - Divider
   ============================================ */
.divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--color-border);
}

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

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Section Utilities */
.bg-red { background-color: var(--color-primary-red); color: var(--color-white); }
.bg-red h2, .bg-red h3, .bg-red h4, .bg-red p { color: var(--color-white); }
.bg-red .text-muted { color: rgba(255, 255, 255, 0.8); }

.bg-black { background-color: var(--color-black); color: var(--color-white); }
.bg-black h2, .bg-black h3, .bg-black h4, .bg-black p { color: var(--color-white); }

.split-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

@media (max-width: 992px) {
    .split-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

/* Slider / Carousel System */
.slider-container {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.slider-track {
    display: flex;
    gap: var(--spacing-lg);
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.slider-slide {
    flex: 0 0 calc(50% - (var(--spacing-lg) / 2));
    min-width: 0;
}

@media (max-width: 992px) {
    .slider-slide {
        flex: 0 0 100%;
    }
}

.slider-controls {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.slider-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--color-white);
    background: transparent;
    color: var(--color-white);
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    z-index: 10;
}

.slider-btn:hover {
    background: var(--color-white);
    color: var(--color-primary-red);
}

.slider-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: transparent;
    color: var(--color-white);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

.animate-slide-up {
    animation: slideUp var(--transition-base) ease-out;
}

/* ============================================
   Responsive Base
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.25rem;
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ============================================
   Loading State
   ============================================ */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   Error/Success Messages
   ============================================ */
.message {
    padding: var(--spacing-md);
    border: 2px solid var(--color-black);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.message-error {
    background-color: var(--color-gray-100);
    border-color: var(--color-black);
}

.message-success {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* ============================================
   Skeleton UI
   ============================================ */

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s infinite linear;
    border-radius: var(--border-radius);
}

@keyframes skeletonShimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
}

.skeleton-text-lg {
    height: 1.5rem;
}

.skeleton-card {
    padding: 1.5rem;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}