/* ============================================
   PLAYGROUND CORE STYLES
   Shared foundation for all playground releases
   ============================================ */

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

/* === CSS VARIABLES === */
:root {
    /* Light mode (default) */
    --bg-primary: #f2f2f0;
    --bg-secondary: #fefefe;
    --bg-tertiary: #fafafa;
    --bg-input: #0f0f0f;
    --border-primary: #e0e0e0;
    --border-secondary: #2a2a2a;
    --text-primary: #000;
    --text-secondary: #666;
    --text-tertiary: #999;
    --text-invert: #fff;
    --accent-primary: #000;
    --accent-secondary: #e0e0e0;
    --hover-primary: #f0f0f0;
    --hover-secondary: #ccc;
    --active-bg: #000;
    --active-text: #fff;
    --viz-bg: #fafafa;
    --viz-line: #000;
    
    /* Status colors */
    --status-live: #00ff00;
    --status-planned: #999;
    --status-beta: #ff9500;
    
    /* Typography scale */
    --letter-spacing-tight: 0.02em;
    --letter-spacing-normal: 0.03em;
    --letter-spacing-wide: 0.05em;
    --letter-spacing-wider: 0.08em;
}

:root.dark-mode {
    /* Dark mode */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #0f0f0f;
    --bg-input: #0f0f0f;
    --border-primary: #2a2a2a;
    --border-secondary: #444;
    --text-primary: #e0e0e0;
    --text-secondary: #999;
    --text-tertiary: #666;
    --text-invert: #000;
    --accent-primary: #e0e0e0;
    --accent-secondary: #2a2a2a;
    --hover-primary: #1a1a1a;
    --hover-secondary: #444;
    --active-bg: #e0e0e0;
    --active-text: #000;
    --viz-bg: #0a0a0a;
    --viz-line: #e0e0e0;
    
    /* Status colors dark mode */
    --status-live: #00ff00;
    --status-planned: #666;
    --status-beta: #ff9500;
}

/* === BODY BASE === */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'Arial', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    position: relative;
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
}

/* === GRAIN TEXTURE OVERLAY (FIXED) === */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.25;
    z-index: 1;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="1.2" numOctaves="6" seed="2" /></filter><rect width="100%" height="100%" filter="url(%23noise)" opacity="1"/></svg>');
}

/* === SUBTLE VIGNETTE === */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    box-shadow: inset 0 0 200px rgba(0,0,0,0.12);
}

/* === HEADER === */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    padding: 1.5rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    overflow: hidden;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.12;
    z-index: 1;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="250" height="250"><filter id="hn"><feTurbulence type="fractalNoise" baseFrequency="1.1" numOctaves="4" /></filter><rect width="100%" height="100%" filter="url(%23hn)"/></svg>');
}

.brand {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: var(--letter-spacing-wide);
    text-transform: lowercase;
    position: relative;
    z-index: 2;
}

/* === CONTAINER === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 2rem;
    position: relative;
    z-index: 2;
}

/* === HERO === */
.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 200;
    letter-spacing: var(--letter-spacing-tight);
    margin-bottom: 0.8rem;
}

.hero p {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 300;
    letter-spacing: var(--letter-spacing-normal);
    transition: all 0.3s ease;
}

/* === CARDS/MODULES === */
.card, .module {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    min-width: 0;
    transition: all 0.15s ease;
}

/* Grain texture on cards/modules */
.card::after, .module::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.12;
    z-index: 1;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="300" height="300"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="5" /></filter><rect width="100%" height="100%" filter="url(%23n)"/></svg>');
}

.card > *, .module > * {
    position: relative;
    z-index: 2;
}

.card:hover {
    border-color: var(--border-secondary);
    transform: translateY(-2px);
}

/* === CARD HEADER === */
.card-header, .module-header {
    margin-bottom: 1rem;
    padding-bottom: 0.8rem;
}

.card-title, .module-title {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: var(--letter-spacing-wider);
    text-transform: lowercase;
    color: var(--text-tertiary);
}

.card-desc, .module-desc {
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: var(--letter-spacing-normal);
    color: #bbb;
    margin-top: 0.3rem;
    line-height: 1.4;
}

/* === BUTTONS === */
.btn {
    width: 100%;
    padding: 1rem;
    background: var(--active-bg);
    border: none;
    color: var(--active-text);
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: lowercase;
    letter-spacing: var(--letter-spacing-wide);
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:hover {
    background: var(--hover-secondary);
}

.btn:active {
    background: var(--active-bg);
    transform: scale(0.98);
}

.btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    width: 100%;
    padding: 1rem;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: lowercase;
    letter-spacing: var(--letter-spacing-wide);
    cursor: pointer;
    transition: all 0.15s ease;
}

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

.btn-secondary.active {
    background: var(--active-bg);
    color: var(--active-text);
    border-color: var(--text-primary);
}

.btn-secondary:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* === LINKS === */
a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--text-secondary);
}

/* === STATUS BADGES === */
.status-badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: lowercase;
    letter-spacing: var(--letter-spacing-wide);
    border-radius: 2px;
    border: 1px solid;
}

.status-badge.live {
    color: #00cc00;
    background: rgba(0, 204, 0, 0.15);
    border-color: #00cc00;
}

.status-badge.planned {
    color: #666;
    background: rgba(102, 102, 102, 0.1);
    border-color: #666;
}

.status-badge.beta {
    color: #ff9500;
    background: rgba(255, 149, 0, 0.15);
    border-color: #ff9500;
}

/* === FOOTER === */
.footer {
    margin-top: 3rem;
    padding: 2rem 0;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.7rem;
    letter-spacing: var(--letter-spacing-normal);
    position: relative;
    z-index: 2;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer a {
    color: var(--text-tertiary);
    text-decoration: none;
    border-bottom: 1px solid var(--border-secondary);
    transition: color 0.2s;
}

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

.separator {
    color: var(--border-primary);
    margin: 0 0.5rem;
}

.version {
    color: var(--text-tertiary);
    text-transform: lowercase;
}

/* === MODAL === */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.modal-content::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.12;
    z-index: 1;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="300" height="300"><filter id="modaln"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="5" /></filter><rect width="100%" height="100%" filter="url(%23modaln)"/></svg>');
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 2;
}

.modal-title {
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: lowercase;
    letter-spacing: var(--letter-spacing-wider);
    color: var(--text-tertiary);
}

.modal-close {
    background: none;
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    padding: 0.3rem 0.6rem;
    cursor: pointer;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: lowercase;
    letter-spacing: var(--letter-spacing-wide);
    transition: all 0.15s ease;
}

.modal-close:hover {
    background: var(--hover-primary);
    border-color: var(--border-secondary);
}

/* === RESPONSIVE BASE === */
@media (max-width: 768px) {
    .header {
        padding: 1rem 1.5rem;
    }

    .brand {
        font-size: 0.9rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 0.8rem;
    }

    .container {
        padding: 1.5rem 1rem;
    }

    .card, .module {
        padding: 1rem;
    }

    .card-header, .module-header {
        margin-bottom: 0.8rem;
        padding-bottom: 0.6rem;
    }

    .card-title, .module-title {
        font-size: 0.65rem;
    }

    .card-desc, .module-desc {
        font-size: 0.6rem;
    }

    .btn, .btn-secondary {
        font-size: 0.7rem;
        padding: 0.8rem;
    }

    .modal-content {
        padding: 1.5rem;
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.8rem 1rem;
    }

    .brand {
        font-size: 0.8rem;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .hero p {
        font-size: 0.75rem;
    }

    .container {
        padding: 1rem 0.8rem;
    }

    .card, .module {
        padding: 0.8rem;
    }
}