/* =========================================================
   pong.css — Pong Mini-Game Section
   =========================================================
   Styles for the interactive Pong game embedded in the site.
   Depends on: variables.css, animations.css (blink keyframe)
   ========================================================= */

/* -------------------------------------------------------
   SECTION WRAPPER
   Inherits base .section layout; adds a top separator
   line to visually divide it from the preceding section.
------------------------------------------------------- */

.section--pong {
    border-top: 1px solid var(--color-green-10);
}

/* -------------------------------------------------------
   PONG WRAPPER
   Centres and stacks the HUD, canvas, and controls
   in a single column.
------------------------------------------------------- */

.pong-wrapper {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* -------------------------------------------------------
   HUD — scoreboard strip above the canvas
------------------------------------------------------- */

.pong-hud {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: rgba(0, 0, 0, 0.4);
    border: var(--border-dim);
    border-bottom: none; /* merges visually with canvas border */
    font-family: var(--font-retro);
}

/* Player (left) and CPU (right) score blocks */
.pong-hud__player,
.pong-hud__cpu {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-width: 160px;
}

/* CPU block reads right-to-left: score → label */
.pong-hud__cpu {
    flex-direction: row-reverse;
}

.pong-hud__label {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    letter-spacing: var(--ls-wider);
    text-transform: uppercase;
}

.pong-hud__score {
    font-size: var(--fs-3xl);
    color: var(--color-green);
    text-shadow: var(--glow-green-sm);
    line-height: 1;
    min-width: 2ch;
    text-align: center;
}

/* Centre column: status message + audio toggle */
.pong-hud__centre {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    flex: 1;
}

.pong-hud__status {
    font-size: var(--fs-sm);
    color: var(--color-amber);
    letter-spacing: var(--ls-wider);
    text-align: center;
    font-family: var(--font-code);
    transition: color 0.3s ease;
}

/* TCP state colors */
.pong-hud__status.tcp-syn {
    color: var(--color-cyan);
}

.pong-hud__status.tcp-established {
    color: var(--color-green);
}

.pong-hud__status.tcp-closing {
    color: rgba(255, 51, 102, 0.9);
}

/* Idle blink — JS adds .blink when game is waiting to start */
.pong-hud__status.blink {
    animation: blink 1s step-end infinite;
}

/* -------------------------------------------------------
   AUDIO TOGGLE BUTTON
   Styled as a compact terminal keycap.
------------------------------------------------------- */

.pong-audio-btn {
    /* reset */
    appearance: none;
    background: transparent;
    outline: none;

    /* keycap styling */
    border: 1px solid var(--color-green-20);
    border-radius: var(--radius-sm);
    padding: var(--space-1) var(--space-3);
    color: var(--text-tertiary);
    font-family: var(--font-code);
    font-size: var(--fs-xs);
    letter-spacing: var(--ls-wide);
    cursor: pointer;

    display: flex;
    align-items: center;
    gap: var(--space-2);
    white-space: nowrap;

    transition: all var(--transition-fast);
}

.pong-audio-btn:hover {
    border-color: var(--color-green-40);
    color: var(--color-green);
}

/* Audio enabled */
.pong-audio-btn[data-audio-state="on"] {
    border-color: var(--color-green-40);
    color: var(--color-green);
    box-shadow: var(--glow-green-sm);
}

/* Tone-bank loading */
.pong-audio-btn[data-audio-state="loading"] {
    border-color: var(--color-amber-30);
    color: var(--color-amber);
    cursor: wait;
}

/* Audio unavailable / load error */
.pong-audio-btn[data-audio-state="error"] {
    border-color: rgba(255, 51, 102, 0.3);
    color: rgba(255, 51, 102, 0.6);
}

.pong-audio-btn__icon {
    font-size: 1em;
}

/* -------------------------------------------------------
   AUDIO SPINNER
   Injected by JS as a <span class="pong-audio-btn__spinner">
   while the audio context / tone-bank is loading.
------------------------------------------------------- */

.pong-audio-btn__spinner {
    display: inline-block;
    width: 10px;
    height: 10px;
    border: 1.5px solid var(--color-amber-30);
    border-top-color: var(--color-amber);
    border-radius: 50%;
    animation: pong-spin 0.7s linear infinite;
    flex-shrink: 0;
}

@keyframes pong-spin {
    to {
        transform: rotate(360deg);
    }
}

/* -------------------------------------------------------
   CANVAS WRAPPER
   Provides the neon border, inner vignette, and CRT
   scanline overlay via a ::after pseudo-element.
   Now styled to look like an old CRT TV.
------------------------------------------------------- */

.pong-canvas-wrapper {
    position: relative;
    line-height: 0; /* eliminates inline gap below <canvas> */
    border: 3px solid var(--color-green-20);
    border-radius: 12px; /* Slight curvature like old TV */
    box-shadow:
        var(--glow-green-sm),
        inset 0 0 60px rgba(0, 0, 0, 0.8),
        0 0 20px rgba(0, 255, 65, 0.15); /* Outer glow */
    overflow: hidden; /* Clip the curvature effect */
    background: #000; /* Black bezel background */
    padding: 8px; /* Bezel thickness */
}

/* CRT scanline overlay — denser scanlines for authentic CRT look */
.pong-canvas-wrapper::after {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        to bottom,
        transparent 0px,
        transparent 2px,
        rgba(0, 0, 0, 0.15) 2px,
        rgba(0, 0, 0, 0.15) 4px
    );
    pointer-events: none;
    z-index: 1;
    border-radius: 8px; /* Match parent curvature */
}

/* Additional CRT effects container */
.pong-canvas-wrapper::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(
        ellipse at center,
        transparent 60%,
        rgba(0, 0, 0, 0.4) 100%
    );
    pointer-events: none;
    z-index: 2;
    border-radius: 8px;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.3); /* Inner vignette */
}

/* Slight barrel distortion effect via border-radius on canvas */
#pong-canvas {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 8 / 5;
    border-radius: 6px; /* Slight curvature */
    position: relative;
    z-index: 0;
    touch-action: manipulation; /* Prevent double-tap zoom, allow touch events */
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on mobile */
}

/* -------------------------------------------------------
   CONTROLS LEGEND
   Inline key hints below the canvas.
------------------------------------------------------- */

.pong-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding: var(--space-2) 0;
}

/* Keycap chip */
.pong-controls__key {
    font-family: var(--font-code);
    font-size: var(--fs-xs);
    color: var(--color-green);
    border: 1px solid var(--color-green-30);
    border-bottom: 2px solid var(--color-green-30); /* keycap depth */
    border-radius: var(--radius-sm);
    padding: 1px var(--space-2);
    background: var(--color-green-05);
}

/* Action label next to the key */
.pong-controls__desc {
    font-family: var(--font-code);
    font-size: var(--fs-xs);
    color: var(--text-tertiary);
    margin-left: calc(var(--space-1) * -1); /* tucks closer to key chip */
}

/* Separator between key+desc pairs */
.pong-controls__sep {
    font-family: var(--font-code);
    font-size: var(--fs-xs);
    color: var(--text-muted);
}

/* Touch-only hint — hidden on desktop, shown on mobile */
.pong-controls__touch {
    display: none;
    font-family: var(--font-code);
    font-size: var(--fs-xs);
    color: var(--text-muted);
    width: 100%;
    text-align: center;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

/* --- Small screens (≤ 640px) ---
   Swap the keyboard legend for the touch instruction and
   tighten the HUD scores/labels to fit narrower viewports.
------------------------------------------------------- */
@media (max-width: 640px) {
    .pong-controls__key,
    .pong-controls__desc,
    .pong-controls__sep {
        display: none;
    }

    .pong-controls__touch {
        display: block;
    }

    .pong-hud {
        padding: var(--space-2) var(--space-3);
    }

    .pong-hud__player,
    .pong-hud__cpu {
        min-width: 50px;
        gap: var(--space-1);
    }

    .pong-hud__label {
        font-size: 9px;
        letter-spacing: 0.5px;
    }

    .pong-hud__score {
        font-size: var(--fs-lg);
        min-width: 1.2ch;
        font-size: 18px;
    }

    .pong-hud__centre {
        gap: var(--space-1);
    }

    .pong-hud__status {
        font-size: 9px;
    }

    .pong-canvas-wrapper {
        border-width: 2px;
        padding: 4px;
        border-radius: 8px;
    }

    #pong-canvas {
        border-radius: 4px;
    }
}

@media (max-width: 380px) {
    .pong-hud__player,
    .pong-hud__cpu {
        min-width: 40px;
    }

    .pong-hud__label {
        font-size: 8px;
    }

    .pong-hud__score {
        font-size: 16px;
        min-width: 1ch;
    }

    .pong-hud__status {
        font-size: 8px;
    }
}

/* =========================================================
   REDUCED MOTION
   Disable spinning and blinking for users who prefer it.
   The game itself is still fully functional.
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
    .pong-audio-btn__spinner {
        animation: none;
    }

    .pong-hud__status.blink {
        animation: none;
    }
}