/**
 * layout.css
 * 16:9 letterbox stage + all split-screen panel layouts.
 * Supports 1, 2, 3, and 4 players in both 1×4 and 2×2 arrangements.
 */

/* ─────────────────────────────────────────────
   FULL-SCREEN STAGE
   Always fills the entire viewport.
   ───────────────────────────────────────────── */
#stage {
    position: fixed;
    inset: 0;
    /* inset:0 already fills the viewport — avoid 100vh which over-estimates on mobile */
    overflow: hidden;
    background-color: var(--background);
}

/* ─────────────────────────────────────────────
   SCREEN VIEWS
   Each "screen" is a full-stage child div.
   Only one is visible at a time (controlled by app.js).
   ───────────────────────────────────────────── */
.screen {
    position: absolute;
    inset: 0;
    display: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.screen.active {
    display: flex;
    opacity: 1;
}

/* ─────────────────────────────────────────────
   PLAYER SELECT SCREEN  (#screen-player-select)
   Full-stage centered layout for the home page.
   ───────────────────────────────────────────── */
#screen-player-select {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
}

/* ─────────────────────────────────────────────
   GAME CONTAINER  (#game-container)
   Hosts the player panels side-by-side or in a grid.
   ───────────────────────────────────────────── */
#game-container {
    position: absolute;
    inset: 0;
    display: none;         /* shown by layout-manager when a layout is active */
}

#game-container.active {
    display: flex;         /* overridden to grid for 2×2 layout */
}

/* White dividers between panels */
#game-container.active:not([data-layout="quiz"]) {
    gap: 3px;
    background: rgba(255, 255, 255, 0.65);
}

/* Quiz layout: full-height single column */
#game-container[data-layout="quiz"] {
    display: flex;
    flex-direction: column;
}
#game-container[data-layout="quiz"] > div {
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

/* ─────────────────────────────────────────────
   LAYOUT: 1 player — full stage
   ───────────────────────────────────────────── */
#game-container[data-layout="1"] {
    display: flex;
    flex-direction: row;
}

#game-container[data-layout="1"] .player-panel {
    flex: 1;
}

/* ─────────────────────────────────────────────
   LAYOUT: 2 players — 2 equal horizontal columns
   ───────────────────────────────────────────── */
#game-container[data-layout="2"] {
    display: flex;
    flex-direction: row;
}

#game-container[data-layout="2"] .player-panel {
    flex: 1;
}

/* ─────────────────────────────────────────────
   LAYOUT: 3 players — 3 equal horizontal columns
   ───────────────────────────────────────────── */
#game-container[data-layout="3"] {
    display: flex;
    flex-direction: row;
}

#game-container[data-layout="3"] .player-panel {
    flex: 1;
}

/* ─────────────────────────────────────────────
   LAYOUT: 4 players (1×4) — 4 vertical strips
   ───────────────────────────────────────────── */
#game-container[data-layout="4-strips"] {
    display: flex;
    flex-direction: row;
}

#game-container[data-layout="4-strips"] .player-panel {
    flex: 1;
}

/* ─────────────────────────────────────────────
   LAYOUT: 4 players (2×2) — 2-column grid
   ───────────────────────────────────────────── */
#game-container[data-layout="4-grid"] {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows:    1fr 1fr;
}

#game-container[data-layout="4-grid"] .player-panel {
    width:  100%;
    height: 100%;
}

/* ─────────────────────────────────────────────
   PLAYER PANEL
   The self-contained cell for each player.
   Player color is set via --panel-color custom property
   injected by layout-manager.js.
   ───────────────────────────────────────────── */
.player-panel {
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background-color: var(--surface-container-low);

    /* Colored border glow distinguishes players */
    outline: 4px solid var(--panel-color, var(--outline-variant));
    outline-offset: -4px;

    /* No glow — flat 2D look */
    box-shadow: none;
}

/* ─────────────────────────────────────────────
   PANEL HEADER
   Sits at the top of every panel; contains the
   player badge, current game name, and back button.
   ───────────────────────────────────────────── */
.panel-header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: color-mix(in srgb, var(--panel-color, var(--surface-variant)) 20%, var(--surface-container));
    border-bottom: 3px solid color-mix(in srgb, var(--panel-color, var(--outline-variant)) 70%, #000);
    box-shadow: 0 3px 0 rgba(0,0,0,0.35);
    z-index: var(--z-header);

    /* Scale header proportionally for narrow panels */
    height: clamp(2rem, 5%, 3rem);
}

.panel-player-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width:  clamp(1.4rem, 3vw, 2rem);
    height: clamp(1.4rem, 3vw, 2rem);
    border-radius: var(--radius-full);
    background: var(--panel-color, var(--surface-variant));
    color: var(--background);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: bold;
    line-height: 1;
    flex-shrink: 0;
    border: 2px solid rgba(0,0,0,0.5);
    box-shadow: 2px 2px 0 rgba(0,0,0,0.4);
    text-shadow: 1px 1px 0 rgba(0,0,0,0.4);
}

.panel-game-name {
    flex: 1;
    font-family: var(--font-body);
    font-size: var(--text-xs);
    color: var(--on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.panel-back-btn {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: clamp(1.2rem, 2.5vw, 1.8rem);
    padding: 0 var(--space-sm);
    border-radius: var(--radius-full);
    border: none;
    background: var(--surface-container-high);
    color: var(--on-surface);
    font-family: var(--font-body);
    font-size: var(--text-xs);
    cursor: pointer;
    border: 2px solid rgba(255,255,255,0.2);
    box-shadow: 1px 2px 0 rgba(0,0,0,0.4);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    white-space: nowrap;
}

.panel-back-btn:hover,
.panel-back-btn:active {
    transform: translate(1px, 2px);
    box-shadow: 0 0 0 rgba(0,0,0,0.4);
}

/* ─────────────────────────────────────────────
   PANEL TIMER BAR
   Thin progress bar between header and content.
   ───────────────────────────────────────────── */
.panel-timer-bar {
    flex-shrink: 0;
    height: 6px;
    background: rgba(255,255,255,0.07);
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
}

.panel-timer-fill {
    height: 100%;
    width: 0%;
    background: #4ade80;
    transition: background 0.5s ease;
    /* width is updated by JS — no CSS transition so it stays smooth */
}

/* ─────────────────────────────────────────────
   PANEL CONTENT AREA
   The scrollable (but usually overflow:hidden) main
   area inside each panel where a game renders.
   ───────────────────────────────────────────── */
.panel-content {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* ─────────────────────────────────────────────
   DIVIDER LINES between panels
   Uses a pseudo-element on the second+ panel.
   ───────────────────────────────────────────── */
.player-panel + .player-panel {
    /* The outline handles visual separation; no extra divider needed */
}

/* ─────────────────────────────────────────────
   MODAL OVERLAY
   Used for 4-player layout choice dialog.
   ───────────────────────────────────────────── */
#modal-overlay {
    position: absolute;
    inset: 0;
    z-index: var(--z-modal);
    background: color-mix(in srgb, var(--background) 80%, transparent);
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    animation: fadeIn var(--transition-normal) both;
}

#modal-overlay.open {
    display: flex;
}

.modal-card {
    background: var(--surface-container-highest);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    max-width: 70%;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    box-shadow:
        0 0 60px 10px color-mix(in srgb, var(--primary) 12%, transparent),
        0 24px 60px rgba(0,0,0,0.6);
    animation: bounceIn var(--transition-bounce) both;
}

.modal-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    color: var(--on-surface);
    text-align: center;
}

.modal-subtitle {
    font-family: var(--font-body);
    font-size: var(--text-md);
    color: var(--on-surface-variant);
    text-align: center;
}

.modal-actions {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
}

/* ─────────────────────────────────────────────
   RESPONSIVE ADJUSTMENTS
   For very wide or very narrow windows.
   ───────────────────────────────────────────── */

/* If the stage is squeezed below 400px wide per panel,
   reduce header padding */
@media (max-width: 800px) {
    .panel-header {
        padding: var(--space-xs);
    }
    .panel-back-btn span {
        display: none; /* hide text label, keep icon only */
    }
}

/* ─────────────────────────────────────────────
   MOBILE: portrait phones (≤ 600px)
   Stack 2-player and 3-player panels vertically
   so each panel gets more height.
   ───────────────────────────────────────────── */
@media (max-width: 600px) {
    #game-container[data-layout="2"],
    #game-container[data-layout="3"] {
        flex-direction: column;
    }

    /* In vertical stack each panel needs a min height */
    #game-container[data-layout="2"] .player-panel {
        min-height: 45vh;
    }
    #game-container[data-layout="3"] .player-panel {
        min-height: 30vh;
    }

    /* Panel header: bigger touch target */
    .panel-header {
        height: clamp(2.4rem, 6%, 3.2rem);
    }
    .panel-back-btn {
        min-height: 2rem;
        min-width: 2rem;
    }
}