/* ═══════════════════════════════════════════════════════════
   NEON SNAKE – Fully Adaptive Responsive Architecture
   Intelligently scales and optimizes for:
   • Large Monitors (4K, 1440p, 1080p Desktop)
   • Laptops & Short Desktops (1366×768, 1280×720)
   • Tablets (iPad, Android Tablets - Portrait & Landscape)
   • Mobile Phones (All aspect ratios, Safe Areas, Notches, Island)
   • Mobile Landscape (Side-by-side fluid layout)
   • Hybrid Devices (Touchscreens with Keyboards/Trackpads)
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
    --bg:          #080a12;
    --surface:     rgba(10, 14, 28, 0.88);
    --border-dim:  rgba(0, 255, 255, 0.12);
    --border-glow: rgba(0, 255, 255, 0.35);
    --cyan:        #00f0ff;
    --cyan-dim:    rgba(0, 240, 255, 0.14);
    --cyan-glow:   rgba(0, 240, 255, 0.55);
    --green:       #00ff88;
    --green-dim:   rgba(0, 255, 136, 0.14);
    --green-glow:  rgba(0, 255, 136, 0.45);
    --red:         #ff2d55;
    --red-dim:     rgba(255, 45, 85, 0.14);
    --red-glow:    rgba(255, 45, 85, 0.55);
    --gold:        #ffd700;
    --text:        #e8eaf6;
    --text-muted:  #6c7a99;
    --font:        'Outfit', sans-serif;
    --font-ar:     'Cairo', 'Outfit', sans-serif;
    --radius-sm:   8px;
    --radius-md:   16px;
    --radius-lg:   22px;
    --tf:          0.15s ease;
    --ts:          0.35s cubic-bezier(0.4, 0, 0.2, 1);

    /* ── Proportional Default Layout Parameters (Desktop) ── */
    --chrome-v:    240px;
    --side-pad:    clamp(16px, 3vw, 40px);
    
    /* Dynamic Board Size: uses available height & width safely */
    --board-size: clamp(
        260px,
        min(calc(100dvh - var(--chrome-v)), calc(100vw - (var(--side-pad) * 2) - 32px), 780px),
        780px
    );
}

/* ── Global Reset & System Safety ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    height: 100%;
    /* Handle Notch & Safe Area Insets seamlessly */
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

body {
    font-family: var(--font);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    overflow-y: auto;
    padding: clamp(6px, 1.5vmin, 20px);
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(0, 60, 120, 0.35) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 90%, rgba(0, 100, 80, 0.25) 0%, transparent 55%),
        radial-gradient(ellipse 40% 40% at 50% 50%, rgba(0, 30, 60, 0.4) 0%, transparent 70%);
    overscroll-behavior-y: contain;
    user-select: none;
    -webkit-user-select: none;
}

/* ── Ambient Floating Particles ── */
.bg-particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    border-radius: 50%;
    opacity: 0;
    animation: float-up 12s infinite ease-in-out;
}

.particle:nth-child(1) { left: 10%; background: var(--cyan);  animation-delay: 0s; animation-duration: 14s; }
.particle:nth-child(2) { left: 25%; background: var(--green); animation-delay: 2s; animation-duration: 11s; }
.particle:nth-child(3) { left: 40%; background: var(--cyan);  animation-delay: 4s; animation-duration: 16s; }
.particle:nth-child(4) { left: 55%; background: var(--green); animation-delay: 1s; animation-duration: 13s; }
.particle:nth-child(5) { left: 70%; background: var(--cyan);  animation-delay: 3s; animation-duration: 15s; }
.particle:nth-child(6) { left: 82%; background: var(--green); animation-delay: 5s; animation-duration: 12s; }
.particle:nth-child(7) { left: 15%; background: var(--cyan);  animation-delay: 7s; animation-duration: 18s; }
.particle:nth-child(8) { left: 90%; background: var(--green); animation-delay: 6s; animation-duration: 10s; }

@keyframes float-up {
    0%   { transform: translateY(100vh) scale(1); opacity: 0; }
    10%  { opacity: 0.6; }
    90%  { opacity: 0.3; }
    100% { transform: translateY(-10vh) scale(0.5); opacity: 0; }
}

/* ── Adaptive Game Container ── */
.game-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(10px, 2vmin, 22px);
    padding: clamp(12px, 2.5vmin, 30px) var(--side-pad) clamp(8px, 1.8vmin, 22px);
    width: min(calc(var(--board-size) + var(--side-pad) * 2), calc(100vw - 16px));
    max-width: 100%;
    border-radius: var(--radius-lg);
    background: var(--surface);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border: 1px solid var(--border-dim);
    box-shadow:
        0 0 0 1px var(--border-dim),
        0 0 50px rgba(0, 200, 255, 0.08),
        0 24px 70px rgba(0, 0, 0, 0.55);
    animation: container-in 0.5s var(--ts) both;
}

@keyframes container-in {
    from { opacity: 0; transform: translateY(16px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Header ── */
.header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: clamp(10px, 2vw, 20px);
}

.title-block {
    line-height: 1;
    flex-shrink: 0;
}

.game-title {
    font-size: clamp(1.35rem, 2.4vw + 0.4rem, 2.5rem);
    font-weight: 900;
    letter-spacing: clamp(1.5px, 0.3vw, 3px);
    color: var(--text);
    text-shadow: 0 0 8px var(--cyan), 0 0 22px var(--cyan-glow);
}

.game-subtitle {
    font-size: clamp(0.52rem, 0.7vw + 0.1rem, 0.76rem);
    font-weight: 400;
    letter-spacing: clamp(2.5px, 0.4vw, 4.5px);
    color: var(--text-muted);
    margin-top: 4px;
    text-transform: uppercase;
}

/* ── HUD Right (Scores + Controls) ── */
.hud-right {
    display: flex;
    align-items: center;
    gap: clamp(8px, 1.5vw, 16px);
}

/* ── Score Cards ── */
.score-board {
    display: flex;
    gap: clamp(6px, 1.2vw, 12px);
}

.score-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--cyan-dim);
    padding: clamp(6px, 1.2vmin, 14px) clamp(12px, 2vw, 26px);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-dim);
    min-width: clamp(64px, 8vw, 100px);
    transition: border-color var(--ts);
}

.score-box:hover {
    border-color: var(--border-glow);
}

.label {
    font-size: clamp(0.56rem, 0.8vw + 0.1rem, 0.74rem);
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.value {
    font-size: clamp(1.2rem, 2vw + 0.2rem, 2.1rem);
    font-weight: 900;
    color: var(--cyan);
    text-shadow: 0 0 6px var(--cyan-glow);
    transition: transform 0.2s, color 0.2s;
    line-height: 1.1;
}

.score-box-best .value {
    color: var(--gold);
    text-shadow: 0 0 6px rgba(255, 215, 0, 0.5);
}

.score-pop {
    animation: score-pop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes score-pop {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.45); }
    100% { transform: scale(1); }
}

/* ── Controls Block (Pause & Mute on Top, Volume Row Below Centered) ── */
.controls-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(3px, 0.6vmin, 5px);
}

.controls-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: clamp(6px, 1vw, 10px);
}

.icon-btn {
    width: clamp(38px, 4.4vw, 48px);
    height: clamp(38px, 4.4vw, 48px);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-dim);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--tf);
    position: relative;
    touch-action: manipulation;
}

.icon-btn svg {
    width: clamp(18px, 2.2vw, 24px);
    height: clamp(18px, 2.2vw, 24px);
}

/* Extended invisible touch-target */
.icon-btn::after {
    content: '';
    position: absolute;
    inset: -6px;
}

.icon-btn:hover {
    background: var(--cyan-dim);
    border-color: var(--border-glow);
    color: var(--cyan);
    box-shadow: 0 0 14px var(--cyan-glow);
}

.icon-btn:active {
    transform: scale(0.9);
}

.icon-btn.active {
    color: var(--cyan);
    border-color: var(--border-glow);
}

.hidden-icon {
    display: none;
}

/* ── Inline Volume Controls (Centered Row Underneath Pause & Mute) ── */
.volume-inline-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(4px, 0.8vw, 8px);
    user-select: none;
    -webkit-user-select: none;
    white-space: nowrap;
}

.vol-mini-btn {
    width: clamp(28px, 3.4vw, 36px);
    height: clamp(28px, 3.4vw, 36px);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-dim);
    color: var(--text-muted);
    font-family: var(--font);
    font-size: clamp(1.05rem, 1.3vw, 1.3rem);
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: all var(--tf);
    position: relative;
    touch-action: manipulation;
    padding: 0;
}

/* Extended touch tap target */
.vol-mini-btn::after {
    content: '';
    position: absolute;
    inset: -6px;
}

.vol-mini-btn:hover {
    background: var(--cyan-dim);
    border-color: var(--border-glow);
    color: var(--cyan);
    box-shadow: 0 0 14px var(--cyan-glow);
}

.vol-mini-btn:active {
    transform: scale(0.9);
}

.vol-mini-display {
    color: var(--cyan);
    font-weight: 800;
    font-size: clamp(0.72rem, 0.9vw, 0.86rem);
    min-width: clamp(22px, 2.6vw, 30px);
    text-align: center;
    font-family: var(--font);
    text-shadow: 0 0 6px var(--cyan-glow);
    line-height: 1;
}

@media (hover: none) and (pointer: coarse), (pointer: coarse) {
    .vol-mini-btn {
        width: clamp(28px, 6.5vmin, 34px);
        height: clamp(28px, 6.5vmin, 34px);
        font-size: clamp(1.1rem, 2.8vmin, 1.3rem);
    }
    .vol-mini-display {
        font-size: clamp(0.74rem, 1.8vmin, 0.86rem);
        min-width: clamp(22px, 5vmin, 28px);
    }
}

/* ── Canvas Wrapper (Main Square Board Area) ── */
.canvas-wrapper {
    position: relative;
    width: var(--board-size);
    height: var(--board-size);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1.5px solid rgba(0, 240, 255, 0.25);
    box-shadow:
        0 0 0 1px rgba(0, 240, 255, 0.08),
        0 0 35px rgba(0, 255, 136, 0.13),
        inset 0 0 24px rgba(0, 0, 0, 0.32);
    flex-shrink: 0;
    touch-action: none; /* Prevents scroll hijacking on canvas touch */
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    background: #080c18;
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: var(--grid-css, 30px) var(--grid-css, 30px);
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Flash Animations */
.canvas-wrapper.flash-eat { animation: flash-eat 0.25s ease; }
.canvas-wrapper.flash-die { animation: flash-die 0.45s ease; }

@keyframes flash-eat {
    0%, 100% { box-shadow: 0 0 0 1px rgba(0, 240, 255, 0.08), 0 0 35px rgba(0, 255, 136, 0.13), inset 0 0 24px rgba(0, 0, 0, 0.32); }
    50%      { box-shadow: 0 0 0 3px var(--green), 0 0 45px var(--green-glow); }
}

@keyframes flash-die {
    0%, 100% { box-shadow: 0 0 0 1px rgba(0, 240, 255, 0.08), 0 0 35px rgba(0, 255, 136, 0.13), inset 0 0 24px rgba(0, 0, 0, 0.32); }
    30%      { box-shadow: 0 0 0 4px var(--red), 0 0 65px var(--red-glow); }
}

/* ── Overlays (Start, Pause, Game Over) ── */
.overlay {
    position: absolute;
    inset: 0;
    background: rgba(4, 6, 14, 0.84);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--ts);
    z-index: 10;
    padding: 10px;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, 2.2vmin, 20px);
    padding: clamp(14px, 3.5vmin, 34px) clamp(16px, 4vmin, 38px);
    border-radius: var(--radius-lg);
    background: rgba(8, 12, 28, 0.94);
    border: 1px solid var(--border-glow);
    box-shadow:
        0 0 0 1px var(--border-dim),
        0 0 60px rgba(0, 200, 255, 0.12);
    max-width: 100%;
    width: 100%;
    text-align: center;
}

.slide-in {
    animation: slide-in 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes slide-in {
    from { opacity: 0; transform: scale(0.9) translateY(14px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.overlay-title {
    font-size: clamp(1.35rem, 4.8vmin, 2.7rem);
    font-weight: 900;
    letter-spacing: 3px;
    text-align: center;
}

.glow-cyan {
    color: var(--cyan);
    text-shadow: 0 0 12px var(--cyan), 0 0 30px var(--cyan-glow);
}

.glow-red {
    color: var(--red);
    text-shadow: 0 0 12px var(--red), 0 0 30px var(--red-glow);
}

.overlay-subtitle {
    font-size: clamp(0.5rem, 1.2vmin, 0.7rem);
    letter-spacing: 4px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: -4px;
}

/* ── Key Hints ── */
.key-hints {
    display: flex;
    flex-direction: column;
    gap: clamp(4px, 1vmin, 7px);
    width: 100%;
}

.key-hint-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: clamp(0.7rem, 1.5vmin, 0.88rem);
    color: var(--text-muted);
}

.key-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 3px 9px;
    border-radius: 5px;
    background: rgba(0, 240, 255, 0.08);
    border: 1px solid var(--border-glow);
    color: var(--cyan);
    font-size: clamp(0.66rem, 1.4vmin, 0.82rem);
    font-weight: 700;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.desktop-hints { display: flex; }
.mobile-hints  { display: none; }

/* ── High Score Badge & Game Over Scores ── */
.badge-new-hs {
    font-size: clamp(0.74rem, 1.7vmin, 0.94rem);
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--gold);
    text-shadow: 0 0 8px rgba(255, 215, 0, 0.6);
    padding: 4px 14px;
    border-radius: 20px;
    border: 1px solid var(--gold);
    background: rgba(255, 215, 0, 0.08);
    animation: pulse-gold 1.2s ease infinite;
    margin-top: -4px;
}

.badge-new-hs.hidden {
    display: none;
}

@keyframes pulse-gold {
    0%, 100% { box-shadow: 0 0 8px rgba(255, 215, 0, 0.3); }
    50%      { box-shadow: 0 0 22px rgba(255, 215, 0, 0.7); }
}

.final-scores {
    display: flex;
    gap: clamp(8px, 2.5vmin, 24px);
}

.final-score-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: clamp(6px, 1.8vmin, 14px) clamp(14px, 3vmin, 28px);
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-dim);
    min-width: clamp(64px, 11vmin, 96px);
}

.fs-label {
    font-size: clamp(0.54rem, 1vmin, 0.7rem);
    letter-spacing: 2px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.fs-value {
    font-size: clamp(1.35rem, 3.8vmin, 2.2rem);
    font-weight: 900;
    color: var(--cyan);
    text-shadow: 0 0 8px var(--cyan-glow);
}

.fs-best {
    color: var(--gold);
    text-shadow: 0 0 8px rgba(255, 215, 0, 0.5);
}

/* ── Glow Button ── */
.glow-btn {
    padding: clamp(10px, 1.8vmin, 15px) clamp(22px, 4.5vmin, 44px);
    font-size: clamp(0.84rem, 1.7vmin, 1.02rem);
    font-weight: 700;
    font-family: var(--font);
    letter-spacing: 2px;
    text-transform: uppercase;
    border: 1.5px solid var(--green);
    border-radius: var(--radius-sm);
    background: var(--green-dim);
    color: var(--green);
    cursor: pointer;
    transition: all var(--tf);
    box-shadow: 0 0 12px var(--green-glow);
    position: relative;
    overflow: hidden;
    isolation: isolate;
    touch-action: manipulation;
    min-height: 44px;
}

.glow-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--green);
    opacity: 0;
    transition: opacity var(--tf);
    z-index: -1;
}

.glow-btn:hover {
    color: #000;
    box-shadow: 0 0 28px var(--green-glow);
    transform: translateY(-2px);
}

.glow-btn:hover::before {
    opacity: 1;
}

.glow-btn:active {
    transform: translateY(0) scale(0.97);
}

.secondary-btn {
    border-color: var(--cyan);
    background: var(--cyan-dim);
    color: var(--cyan);
    box-shadow: 0 0 12px var(--cyan-glow);
}
.secondary-btn::before {
    background: var(--cyan);
}
.secondary-btn:hover {
    color: #000;
    box-shadow: 0 0 28px var(--cyan-glow);
}

.danger-btn {
    padding: clamp(8px, 1.5vmin, 12px) clamp(14px, 3vmin, 22px);
    font-size: clamp(0.74rem, 1.4vmin, 0.88rem);
    font-weight: 700;
    font-family: var(--font);
    letter-spacing: 1px;
    border: 1px solid var(--red);
    border-radius: var(--radius-sm);
    background: var(--red-dim);
    color: var(--red);
    cursor: pointer;
    transition: all var(--tf);
    box-shadow: 0 0 10px var(--red-glow);
    touch-action: manipulation;
    width: 100%;
}
.danger-btn:hover {
    background: var(--red);
    color: #fff;
    box-shadow: 0 0 20px var(--red-glow);
    transform: translateY(-1px);
}
.danger-btn:active {
    transform: scale(0.97);
}

/* ── Menu Screen ── */
.menu-card {
    max-width: 360px;
    gap: clamp(12px, 2.5vmin, 20px);
}

.menu-actions {
    display: flex;
    flex-direction: column;
    gap: clamp(8px, 1.8vmin, 14px);
    width: 100%;
}

.menu-btn {
    width: 100%;
}

.lang-toggle-group {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-dim);
    border-radius: 20px;
    padding: 4px 12px;
    margin-top: 4px;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font);
    font-size: clamp(0.72rem, 1.4vmin, 0.84rem);
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: color var(--tf), text-shadow var(--tf);
    padding: 2px 6px;
    border-radius: 12px;
}

.lang-btn.active {
    color: var(--cyan);
    text-shadow: 0 0 8px var(--cyan-glow);
}

.lang-btn:hover:not(.active) {
    color: var(--text);
}

.lang-divider {
    color: var(--border-dim);
    font-size: 0.8rem;
}

/* ── Mode Select Screen ── */
.mode-select-card {
    position: relative;
    max-width: 380px;
    gap: clamp(12px, 2.5vmin, 20px);
    padding: clamp(14px, 3vmin, 26px) clamp(14px, 3.2vmin, 28px);
}

.mode-select-card .overlay-title {
    padding: 0 clamp(24px, 5vmin, 36px);
    width: 100%;
}

.modes-list {
    display: flex;
    flex-direction: column;
    gap: clamp(10px, 2vmin, 16px);
    width: 100%;
}

.mode-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: clamp(12px, 2.4vmin, 18px) clamp(14px, 2.8vmin, 20px);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-dim);
    text-align: left;
    transition: all var(--tf);
    user-select: none;
    -webkit-user-select: none;
    width: 100%;
    font-family: var(--font);
    box-sizing: border-box;
}

html[dir="rtl"] .mode-card {
    text-align: right;
}

.active-mode {
    cursor: pointer;
    border-color: var(--green);
    background: rgba(0, 255, 136, 0.06);
    box-shadow: 0 0 14px rgba(0, 255, 136, 0.15);
    touch-action: manipulation;
}

.active-mode:hover {
    background: var(--green-dim);
    border-color: var(--green);
    box-shadow: 0 0 24px var(--green-glow);
    transform: translateY(-2px);
}

.active-mode:active {
    transform: scale(0.98);
}

.mode-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.mode-name {
    font-size: clamp(0.92rem, 1.8vmin, 1.15rem);
    font-weight: 800;
    letter-spacing: 1.5px;
}

.glow-green {
    color: var(--green);
    text-shadow: 0 0 10px var(--green-glow);
}

.mode-badge {
    font-size: clamp(0.6rem, 1.2vmin, 0.72rem);
    font-weight: 800;
    letter-spacing: 1px;
    padding: 3px 8px;
    border-radius: 6px;
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--green);
}

.mode-desc {
    font-size: clamp(0.7rem, 1.4vmin, 0.84rem);
    color: var(--text-muted);
    line-height: 1.35;
    margin: 0;
}

.disabled-mode {
    opacity: 0.55;
    cursor: not-allowed;
    border-style: dashed;
    border-color: var(--border-dim);
    background: rgba(255, 255, 255, 0.02);
}

.mode-locked {
    color: var(--text-muted);
    font-weight: 700;
}

/* ── Settings Screen ── */
.settings-card {
    position: relative;
    max-width: 380px;
    max-height: 92%;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--cyan-dim) transparent;
    gap: clamp(10px, 2vmin, 16px);
    padding: clamp(14px, 3vmin, 26px) clamp(14px, 3.2vmin, 28px);
}

.settings-card .overlay-title {
    padding: 0 clamp(24px, 5vmin, 36px);
    width: 100%;
}

.modal-close-btn {
    position: absolute;
    top: clamp(10px, 2vmin, 16px);
    right: clamp(10px, 2vmin, 16px);
    width: clamp(28px, 3.5vmin, 34px);
    height: clamp(28px, 3.5vmin, 34px);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-dim);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--tf);
    touch-action: manipulation;
    padding: 0;
    z-index: 10;
}

html[dir="rtl"] .modal-close-btn {
    right: auto;
    left: clamp(10px, 2vmin, 16px);
}

.modal-close-btn svg {
    width: 55%;
    height: 55%;
    pointer-events: none;
}

/* Extended comfortable touch tap target */
.modal-close-btn::after {
    content: '';
    position: absolute;
    inset: -8px;
}

.modal-close-btn:hover {
    background: var(--cyan-dim);
    border-color: var(--border-glow);
    color: var(--cyan);
    box-shadow: 0 0 14px var(--cyan-glow);
}

.modal-close-btn:active {
    transform: scale(0.9);
}

.settings-list {
    display: flex;
    flex-direction: column;
    gap: clamp(8px, 1.5vmin, 12px);
    width: 100%;
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-dim);
    border-radius: var(--radius-sm);
    padding: clamp(6px, 1.2vmin, 10px) clamp(10px, 2vmin, 16px);
}

.setting-label {
    font-size: clamp(0.72rem, 1.5vmin, 0.86rem);
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text);
}

.toggle-pill {
    min-width: 58px;
    padding: 5px 12px;
    border-radius: 14px;
    font-family: var(--font);
    font-size: clamp(0.72rem, 1.4vmin, 0.84rem);
    font-weight: 800;
    letter-spacing: 1px;
    cursor: pointer;
    border: 1px solid var(--red);
    background: var(--red-dim);
    color: var(--red);
    transition: all var(--tf);
}

.toggle-pill.active {
    border-color: var(--green);
    background: var(--green-dim);
    color: var(--green);
    box-shadow: 0 0 10px var(--green-glow);
}

.settings-vol-control {
    background: none;
    border: none;
    height: auto;
    padding: 0;
}

.setting-box {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-sm);
    padding: clamp(8px, 1.5vmin, 12px);
    text-align: left;
}

html[dir="rtl"] .setting-box {
    text-align: right;
}

.setting-box-title {
    font-size: clamp(0.68rem, 1.3vmin, 0.78rem);
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--cyan);
}

.setting-hints-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    font-size: clamp(0.64rem, 1.2vmin, 0.76rem);
    color: var(--text-muted);
}

.setting-hint-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.reset-row {
    background: none;
    border: none;
    padding: 0;
    margin-top: 2px;
}

/* ── Reset Confirmation Modal ── */
.confirm-modal {
    position: absolute;
    inset: 0;
    background: rgba(4, 6, 16, 0.90);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    z-index: 25;
    padding: 16px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.confirm-modal.hidden {
    display: none;
}

.confirm-card {
    background: rgba(14, 18, 36, 0.96);
    border: 1px solid var(--red-glow);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    box-shadow: 0 0 30px rgba(255, 45, 85, 0.25);
    max-width: 280px;
    text-align: center;
}

.confirm-text {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
}

.confirm-actions {
    display: flex;
    gap: 10px;
    width: 100%;
}

.confirm-btn {
    flex: 1;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--tf);
    touch-action: manipulation;
}

.yes-btn {
    border: 1px solid var(--red);
    background: var(--red);
    color: #fff;
    box-shadow: 0 0 10px var(--red-glow);
}
.yes-btn:hover {
    box-shadow: 0 0 20px var(--red);
}

.no-btn {
    border: 1px solid var(--border-dim);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
}
.no-btn:hover {
    color: var(--text);
    border-color: var(--text);
}

/* ── Arabic Typography & RTL support ── */
html[dir="rtl"] {
    font-family: var(--font-ar);
}
html[dir="rtl"] button,
html[dir="rtl"] input {
    font-family: var(--font-ar);
}

/* ── Particle Burst ── */
.particle-burst {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
    overflow: hidden;
}

.burst-dot {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    pointer-events: none;
    animation: burst-out 0.5s ease forwards;
}

@keyframes burst-out {
    0%   { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(var(--tx), var(--ty)) scale(0); opacity: 0; }
}

/* ── D-Pad Touch Controls (Base) ── */
.dpad-container {
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2px 0;
    user-select: none;
    -webkit-user-select: none;
}

.dpad {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(3px, 0.8vmin, 5px);
}

.dpad-row {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: clamp(3px, 0.8vmin, 5px);
}

.dpad-btn {
    width: clamp(50px, 14vmin, 72px);
    height: clamp(50px, 14vmin, 72px);
    border-radius: 10px;
    background: rgba(0, 240, 255, 0.08);
    border: 1.5px solid var(--border-glow);
    color: var(--cyan);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.1s, box-shadow 0.1s, transform 0.08s;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    position: relative;
}

/* Invisible extended tap area */
.dpad-btn::after {
    content: '';
    position: absolute;
    inset: -6px;
}

.dpad-btn svg {
    width: 55%;
    height: 55%;
    pointer-events: none;
}

.dpad-btn:hover {
    background: var(--cyan-dim);
}

.dpad-btn:active,
.dpad-btn.pressed {
    background: rgba(0, 240, 255, 0.25);
    box-shadow: 0 0 16px var(--cyan-glow);
    transform: scale(0.92);
    border-color: var(--cyan);
}

.dpad-center {
    width: clamp(50px, 14vmin, 72px);
    height: clamp(50px, 14vmin, 72px);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

/* ── Footer Keyboard Hints ── */
.footer-hints {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
    gap: clamp(8px, 1.3vw, 16px);
    font-size: clamp(0.74rem, 0.95vw + 0.1rem, 0.92rem);
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.key-chip-sm {
    display: inline-flex;
    align-items: center;
    padding: 3px 9px;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.15);
    font-size: clamp(0.68rem, 0.88vw + 0.08rem, 0.86rem);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.6);
}

.hint-sep {
    color: rgba(255, 255, 255, 0.2);
}

/* ════════════════════════════════════════════════════════════
   ADAPTIVE CAPABILITY & VIEWPORT ARCHITECTURE
   ════════════════════════════════════════════════════════════ */

/* ── Touch / Coarse Pointer Devices & Touch-Active Mode ── */
@media (hover: none) and (pointer: coarse), (pointer: coarse) {
    .dpad-container { display: flex; }
    .desktop-hints  { display: none; }
    .mobile-hints   { display: flex; }
    .desktop-only   { display: none; }
    .icon-btn       { width: 46px; height: 46px; }
    .icon-btn svg   { width: 22px; height: 22px; }
}

body.touch-active .dpad-container {
    display: flex;
}

body.touch-active .desktop-hints {
    display: none;
}

body.touch-active .mobile-hints {
    display: flex;
}

body.touch-active .desktop-only {
    display: none;
}

/* ── 1. PORTRAIT TOUCH SCREENS (Phones AND Tablets e.g. 768×1024, 430×932, 360×800) ── */
@media (hover: none) and (pointer: coarse) and (orientation: portrait),
       (pointer: coarse) and (orientation: portrait) {
    :root {
        --side-pad: clamp(8px, 2.5vw, 24px);
        /* Strictly reserve space for header (~65px) + D-Pad (~180-220px) + padding/gaps (~50px) */
        --board-size: clamp(
            220px,
            min(
                calc(100vw - (var(--side-pad) * 2) - 16px),
                calc(100dvh - clamp(270px, 33vh, 360px)),
                600px
            ),
            600px
        );
    }

    body {
        padding: clamp(4px, 1.5vmin, 12px);
    }

    .game-container {
        gap: clamp(6px, 1.5vmin, 14px);
        padding: clamp(10px, 2vmin, 16px) var(--side-pad) clamp(4px, 1vmin, 10px);
        width: min(calc(var(--board-size) + var(--side-pad) * 2), calc(100vw - 12px));
    }

    /* 2-Row Responsive Header for Touch Portrait */
    .header {
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
    }

    .title-block {
        text-align: center;
    }

    .game-title {
        font-size: clamp(1.25rem, 5vw, 1.8rem);
    }

    .game-subtitle {
        font-size: clamp(0.5rem, 1.5vw, 0.65rem);
        letter-spacing: 3px;
        margin-top: 2px;
    }

    .hud-right {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        gap: 6px;
    }

    .score-board {
        gap: 6px;
    }

    .score-box {
        padding: 6px 12px;
        min-width: 60px;
    }

    .label {
        font-size: 0.56rem;
    }

    .value {
        font-size: 1.25rem;
    }

    .controls-top-row,
    .controls-row {
        gap: 6px;
    }

    .icon-btn {
        width: 44px;
        height: 44px;
    }

    /* Adaptive D-Pad in portrait */
    .dpad-btn {
        width: clamp(56px, min(17vw, 7.8vh), 72px);
        height: clamp(56px, min(17vw, 7.8vh), 72px);
    }

    .dpad-center {
        width: clamp(56px, min(17vw, 7.8vh), 72px);
        height: clamp(56px, min(17vw, 7.8vh), 72px);
    }

    .overlay-card {
        padding: clamp(12px, 2.5vmin, 20px) clamp(14px, 3vmin, 24px);
        gap: 8px;
    }

    .overlay-title {
        font-size: clamp(1.3rem, 6vw, 2.2rem);
    }

    .glow-btn {
        padding: 11px 24px;
        font-size: 0.9rem;
        min-height: 44px;
    }
}

/* Also support dynamic JS touch-active class in portrait */
body.touch-active:not(.non-portrait) {
    --side-pad: clamp(8px, 2.5vw, 24px);
}

/* ── 2. LANDSCAPE TOUCH SCREENS (Tablets 1024×768, Phones 932×430, 844×390, etc.) ── */
@media (hover: none) and (pointer: coarse) and (orientation: landscape),
       (pointer: coarse) and (orientation: landscape) {
    :root {
        --side-pad: clamp(8px, 1.5vw, 16px);
        /* Board calculates dynamically from available height */
        --board-size: clamp(
            180px,
            min(
                calc(100dvh - clamp(60px, 11vh, 90px)),
                calc(100vw - clamp(180px, 26vw, 280px)),
                620px
            ),
            620px
        );
    }

    body {
        padding: 4px clamp(6px, 1.2vw, 16px);
    }

    .game-container {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
        gap: 0;
        column-gap: clamp(10px, 2vw, 24px);
        row-gap: 2px;
        padding: 6px var(--side-pad) 6px;
        width: auto;
        max-width: 100%;
    }

    .header {
        width: 100%;
        order: -1;
        gap: 12px;
        margin-bottom: 2px;
    }

    .game-title {
        font-size: clamp(1.05rem, 2.5vh + 0.3rem, 1.6rem);
        letter-spacing: 1.5px;
    }

    .game-subtitle {
        display: none;
    }

    .score-box {
        padding: 4px 10px;
        min-width: 50px;
    }

    .label {
        font-size: 0.54rem;
    }

    .value {
        font-size: clamp(0.95rem, 2.2vh, 1.35rem);
    }

    .controls-top-row,
    .controls-row {
        gap: 6px;
    }

    .icon-btn {
        width: clamp(34px, 5.5vh, 44px);
        height: clamp(34px, 5.5vh, 44px);
    }

    .icon-btn svg {
        width: 16px;
        height: 16px;
    }

    .canvas-wrapper {
        order: 0;
    }

    .dpad-container {
        order: 1;
        align-self: center;
        padding: 0;
        padding-left: 4px;
    }

    .footer-hints {
        display: none;
    }

    /* Side D-Pad scaled to available height */
    .dpad-btn {
        width: clamp(42px, min(12.5vh, 9vw), 66px);
        height: clamp(42px, min(12.5vh, 9vw), 66px);
        border-radius: 8px;
    }

    .dpad-center {
        width: clamp(42px, min(12.5vh, 9vw), 66px);
        height: clamp(42px, min(12.5vh, 9vw), 66px);
        border-radius: 8px;
    }

    .overlay-card {
        padding: 10px 14px;
        gap: 6px;
    }

    .overlay-title {
        font-size: clamp(1.2rem, 4.5vh, 1.8rem);
    }

    .glow-btn {
        padding: 7px 16px;
        font-size: 0.82rem;
        min-height: 36px;
    }
}

/* ── 3. EXTRA SMALL PHONES (≤360px Portrait) ── */
@media (max-width: 360px) and (orientation: portrait) {
    :root {
        --side-pad: 4px;
        --board-size: min(calc(100vw - 12px), calc(100dvh - 265px));
    }

    body {
        padding: 4px;
    }

    .game-container {
        gap: 4px;
        padding: 6px var(--side-pad) 2px;
    }

    .game-title {
        font-size: 1.15rem;
    }

    .score-box {
        padding: 4px 8px;
        min-width: 52px;
    }

    .value {
        font-size: 1.1rem;
    }

    .dpad-btn {
        width: clamp(48px, 14vw, 58px);
        height: clamp(48px, 14vw, 58px);
    }

    .dpad-center {
        width: clamp(48px, 14vw, 58px);
        height: clamp(48px, 14vw, 58px);
    }
}

/* ── 4. LARGE DESKTOP & HIGH-RES MONITORS (Non-touch / Fine Pointer) ── */
@media (hover: hover) and (pointer: fine) and (min-width: 1400px) and (min-height: 900px) {
    :root {
        --chrome-v: 260px;
        --side-pad: 44px;
        --board-size: clamp(620px, min(calc(100dvh - var(--chrome-v)), 60vw), 780px);
    }

    .game-container {
        gap: 24px;
        padding: 34px var(--side-pad) 26px;
    }

    .game-title {
        font-size: 2.4rem;
    }

    .value {
        font-size: 2.1rem;
    }

    .icon-btn {
        width: 54px;
        height: 54px;
    }

    .icon-btn svg {
        width: 24px;
        height: 24px;
    }
}