/* ==========================================================================
   0. FONTS
   ========================================================================== */
@font-face {
    font-family: InterVariable;
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url("assets/fonts/InterVariable.woff2") format("woff2");
}

@font-face {
    font-family: InterVariable;
    font-style: italic;
    font-weight: 100 900;
    font-display: swap;
    src: url("assets/fonts/InterVariable-Italic.woff2") format("woff2");
}

/* ==========================================================================
   1. DESIGN TOKENS (Variables)
   ========================================================================== */
:root {
    /* Typography */
    --ui-font-family: "InterVariable", system-ui, sans-serif;
    --font-sans: var(--ui-font-family);
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    --font-weight-black: 900;

    --ui-font-size-xs: 0.78rem;
    --ui-font-size-sm: 0.9rem;
    --ui-font-size-md: 1rem;
    --ui-font-size-lg: 1.2rem;
    --ui-font-size-xl: 1.45rem;
    --ui-font-size-display: 2rem;

    /* Colors - Core */
    --color-bg-base: #0f0f0f;
    --color-text-primary: rgba(255, 255, 255, 0.87);
    --color-text-muted: #aaa;
    --color-text-light: #fff;
    --color-text-dim: #ddd;

    /* Colors - Surfaces */
    --color-surface-1: #222;
    --color-surface-2: #2a2a2a;
    --color-surface-3: #333;
    --color-surface-4: #444;
    --color-surface-5: #555;

    /* Colors - Surface Transparency */
    --color-surface-trans-18: rgba(0, 0, 0, 0.18);
    --color-surface-trans-22: rgba(0, 0, 0, 0.22);
    --color-surface-trans-55: rgba(0, 0, 0, 0.55);
    --color-surface-trans-60: rgba(0, 0, 0, 0.6);
    --color-surface-trans-70: rgba(0, 0, 0, 0.7);
    --color-surface-trans-75: rgba(0, 0, 0, 0.75);

    /* Colors - Borders */
    --color-border-subtle: rgba(255, 255, 255, 0.08);
    --color-border-default: rgba(255, 255, 255, 0.15);

    /* Colors - Semantic Accents */
    --color-accent-blue: #4a9eff;
    --color-accent-blue-hover: #3a8eef;
    --color-accent-gold: #ffd700;
    --color-accent-orange: #ffd28a;
    --color-accent-mint: #7af1b9;
    --color-accent-green: #00c26e;

    /* Geometry */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-pill: 999px;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;

    /* Shadows */
    --shadow-elevation-1: 0 4px 12px rgba(0, 0, 0, 0.6);
    --shadow-elevation-2: 0 4px 20px rgba(0, 0, 0, 0.5);

    /* Outline / Highlight */
    --color-outline-focus: rgba(255, 255, 255, 0.92);
    --color-border-dashed: rgba(255, 255, 255, 0.25);
}

/* ==========================================================================
   2. RESET & BASE
   ========================================================================== */
body {
    margin: 0;
    padding: 0;
    color: var(--color-text-primary);
    background-color: var(--color-bg-base);
    font-family: var(--font-sans);
    font-size: var(--ui-font-size-md);
}

html,
body {
    width: 100%;
    height: 100%;
}

/* ==========================================================================
   3. LAYOUT & SHELL
   ========================================================================== */
#app {
    width: 100%;
    height: 100dvh;
    overflow: hidden;
    position: relative;
}

#ui-root {
    position: absolute;
    inset: 0;
    z-index: 20;
    pointer-events: none;
}

#game-container {
    position: absolute;
    inset: 0;
    z-index: 0;
}

#game-container canvas {
    display: block;
}

.ui-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
    --ui-overlay-z: 100;
    z-index: var(--ui-overlay-z);
}

/* ==========================================================================
   4. COMPONENTS
   ========================================================================== */

/* Typography reset for UI components */
.ui-modal,
.ui-panel,
.ui-button,
.ui-chip,
.ui-close-btn,
.ui-modal-title,
.ui-panel-title {
    font-family: var(--font-sans);
}

/* Modals */
.ui-modal {
    background: var(--color-surface-2);
    color: var(--color-text-light);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-elevation-2);
    border: 1px solid var(--color-surface-4);
}

.ui-modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-surface-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ui-modal-title {
    margin: 0;
    font-size: var(--ui-font-size-lg);
}

/* Buttons */
.ui-close-btn {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: var(--ui-font-size-lg);
}

.ui-button {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    background: var(--color-surface-trans-60);
    color: var(--color-text-light);
    border: 1px solid var(--color-border-default);
    cursor: pointer;
    font-size: var(--ui-font-size-sm);
}

.ui-button:hover {
    background: var(--color-surface-trans-75);
}

.ui-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.ui-button--ghost {
    background: rgba(255, 255, 255, 0.08);
}

.ui-button--ghost:hover {
    background: rgba(255, 255, 255, 0.16);
}

.ui-button--tiny {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--ui-font-size-xs);
    line-height: 1;
}

.ui-button--action {
    background: var(--color-accent-blue);
    font-weight: 700;
    border-color: rgba(255, 255, 255, 0.08);
}

.ui-button--action:hover {
    background: var(--color-accent-blue-hover);
}

/* Panels */
.ui-panel {
    background: var(--color-surface-trans-70);
    color: var(--color-text-light);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
}

.ui-panel-title {
    margin: 0 0 var(--space-sm) 0;
    font-size: var(--ui-font-size-lg);
    font-weight: 700;
}

/* Chips */
.ui-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    background: var(--color-surface-trans-60);
    color: var(--color-text-light);
    font-size: var(--ui-font-size-sm);
}

/* Progress */
.ui-progress {
    width: 100%;
    height: 10px;
    background: var(--color-surface-3);
    margin-top: var(--space-sm);
    border-radius: 5px;
    overflow: hidden;
}

.ui-progress-fill {
    height: 100%;
    background: var(--color-accent-green);
    transition: width 0.3s ease;
}

/* Floating / Card Utilities */
.ui-floating {
    background: var(--color-surface-trans-60);
    color: var(--color-text-dim);
    border-radius: var(--radius-lg);
    padding: var(--space-sm) var(--space-md);
}

.ui-notched-card {
    position: relative;
    background: var(--color-surface-3);
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    box-sizing: border-box;
}

.ui-notched-card::after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    border-top: 18px solid transparent;
    border-bottom: 18px solid transparent;
}

.ui-notched-card--notch-left::after {
    right: -28px;
    border-left: 28px solid var(--color-surface-3);
}

.ui-notched-card--notch-right::after {
    left: -28px;
    border-right: 28px solid var(--color-surface-3);
}

/* ==========================================================================
   5. UTILITIES
   ========================================================================== */
.ui-muted {
    opacity: 0.7;
}