/* ========================================
   FUTABITS LANDING PAGE STYLES
   ======================================== */

/* ========================================
   1. CSS RESET & BASE
   ======================================== */

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

/* ========================================
   2. CSS CUSTOM PROPERTIES (THEME VARIABLES)
   ======================================== */

:root {
    /* Typography */
    --font-mono: 'SF Mono', 'Consolas', 'Monaco', 'Liberation Mono', 'Courier New', monospace;
    --font-weight: 500;

    /* Spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Container */
    --container-max: 900px;
    --container-padding: 1.5rem;

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
}

/* Light Theme (Default) */
[data-theme="light"] {
    --color-bg: #f8fafc;
    --color-bg-elevated: #ffffff;
    --color-text-primary: #1e1b4b;
    --color-text-secondary: #475569;
    --color-accent: #6366f1;
    --color-accent-hover: #4f46e5;
    --color-accent-text: #ffffff;
    --color-border: #e2e8f0;
    --color-wip-bg: #fef3c7;
    --color-wip-text: #92400e;
    --color-wip-border: #f59e0b;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-elevated: #1e293b;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-accent: #a5b4fc;
    --color-accent-hover: #c7d2fe;
    --color-accent-text: #0f172a;
    --color-border: #334155;
    --color-wip-bg: #422006;
    --color-wip-text: #fcd34d;
    --color-wip-border: #d97706;
}

/* ========================================
   3. BASE STYLES
   ======================================== */

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

body {
    font-family: var(--font-mono);
    font-weight: var(--font-weight);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal),
                color var(--transition-normal);
}

main {
    flex: 1;
}

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

/* ========================================
   4. LAYOUT UTILITIES
   ======================================== */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

/* ========================================
   5. HERO SECTION
   ======================================== */

.hero {
    padding: var(--space-2xl) 0;
    min-height: 50vh;
    display: flex;
    align-items: center;
}

.hero .container {
    width: 100%;
}

.hero-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.hero-logo {
    margin-bottom: var(--space-lg);
}

.hero-logo img {
    height: 48px;
    width: auto;
    margin: 0 auto;
}

/* Logo switching based on theme */
.logo-light {
    display: block;
}

.logo-dark {
    display: none;
}

[data-theme="dark"] .logo-light {
    display: none;
}

[data-theme="dark"] .logo-dark {
    display: block;
}

.hero-tagline {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    color: var(--color-accent);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
    transition: color var(--transition-normal);
}

.hero-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
    transition: color var(--transition-normal);
}

.btn-primary {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-mono);
    font-weight: var(--font-weight);
    font-size: 1rem;
    background: var(--color-accent);
    color: var(--color-accent-text);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    white-space: nowrap;
    transition: background-color var(--transition-fast),
                transform var(--transition-fast);
}

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

.btn-primary:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
}

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

/* ========================================
   6. PROJECTS SECTION
   ======================================== */

.projects {
    padding: var(--space-xl) 0 var(--space-2xl);
}

.section-title {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color var(--transition-normal);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    max-width: 600px;
    margin: 0 auto;
}

.project-card {
    display: block;
    position: relative;
    padding: var(--space-lg);
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                border-color var(--transition-fast),
                background-color var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.15);
}

[data-theme="dark"] .project-card:hover {
    box-shadow: 0 12px 40px rgba(165, 180, 252, 0.1);
}

.wip-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-wip-bg);
    color: var(--color-wip-text);
    border: 1px solid var(--color-wip-border);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
    transition: background-color var(--transition-normal),
                color var(--transition-normal),
                border-color var(--transition-normal);
}

.project-card h3 {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
    transition: color var(--transition-normal);
}

.project-card p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    transition: color var(--transition-normal);
}

/* ========================================
   7. FOOTER
   ======================================== */

.footer {
    padding: var(--space-lg) 0;
    transition: border-color var(--transition-normal);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

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

.footer-links {
    display: flex;
    gap: var(--space-md);
}

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

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

/* ========================================
   8. RESPONSIVE DESIGN
   ======================================== */

/* Mobile: < 640px */
@media (max-width: 639px) {
    .hero {
        padding: var(--space-xl) 0;
        min-height: auto;
    }

    .hero-logo img {
        height: 40px;
    }

    .btn-primary {
        width: 100%;
        text-align: center;
    }

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

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ========================================
   9. ACCESSIBILITY
   ======================================== */

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-border: currentColor;
    }

    .project-card {
        border-width: 3px;
    }
}