/* ============================================================================
   Battleship Probability Map — Premium Dark Naval Theme
   ============================================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ---------- Design Tokens ---------- */
:root {
    /* --- Dark Naval Palette --- */
    --bg-deep:           #0a0e1a;
    --bg-ocean:          #0d1425;
    --surface-primary:   rgba(16, 24, 48, 0.85);
    --surface-secondary: rgba(20, 30, 60, 0.60);
    --surface-elevated:  rgba(22, 34, 68, 0.92);
    --surface-glass:     rgba(255, 255, 255, 0.04);
    --surface-overlay:   rgba(0, 0, 0, 0.65);

    /* --- Text --- */
    --text-primary:   rgba(255, 255, 255, 0.92);
    --text-secondary: rgba(255, 255, 255, 0.55);
    --text-tertiary:  rgba(255, 255, 255, 0.30);
    --text-inverse:   #0a0e1a;

    /* --- Accent --- */
    --accent:         #38bdf8;
    --accent-glow:    rgba(56, 189, 248, 0.25);
    --accent-subtle:  rgba(56, 189, 248, 0.08);

    /* --- Semantic --- */
    --hit-bg:         #f43f5e;
    --hit-glow:       rgba(244, 63, 94, 0.35);
    --miss-bg:        rgba(255, 255, 255, 0.12);
    --miss-dot:       rgba(255, 255, 255, 0.40);
    --sunk-bg:        rgba(255, 255, 255, 0.08);

    /* --- Heatmap (smooth teal->cyan->white ramp) --- */
    --prob-0:  transparent;
    --prob-1:  rgba(56, 189, 248, 0.08);
    --prob-2:  rgba(56, 189, 248, 0.18);
    --prob-3:  rgba(56, 189, 248, 0.32);
    --prob-4:  rgba(56, 189, 248, 0.50);
    --prob-5:  rgba(56, 189, 248, 0.70);
    --prob-6:  rgba(56, 189, 248, 0.90);

    /* --- Grid --- */
    --cell-bg:        rgba(255, 255, 255, 0.03);
    --cell-border:    rgba(255, 255, 255, 0.06);
    --grid-gap:       2px;

    /* --- Borders --- */
    --border-subtle:  rgba(255, 255, 255, 0.06);
    --border-medium:  rgba(255, 255, 255, 0.12);

    /* --- Radii --- */
    --radius-xs:   4px;
    --radius-sm:   8px;
    --radius-md:   12px;
    --radius-lg:   16px;
    --radius-xl:   20px;
    --radius-2xl:  24px;
    --radius-pill: 999px;

    /* --- Shadows & Glows --- */
    --shadow-card:     0 8px 32px rgba(0, 0, 0, 0.40), 0 1px 2px rgba(0, 0, 0, 0.20);
    --shadow-elevated: 0 16px 48px rgba(0, 0, 0, 0.50), 0 2px 8px rgba(0, 0, 0, 0.30);
    --shadow-modal:    0 32px 80px rgba(0, 0, 0, 0.60), 0 4px 16px rgba(0, 0, 0, 0.30);
    --glow-hit:        0 0 20px var(--hit-glow), 0 0 6px var(--hit-glow);
    --glow-accent:     0 0 16px var(--accent-glow), 0 0 4px var(--accent-glow);

    /* --- Spacing (8pt grid) --- */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 20px;
    --sp-6: 24px;
    --sp-8: 32px;
    --sp-10: 40px;

    /* --- Typography --- */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text',
                   'Inter', 'Segoe UI', system-ui, Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'SF Mono', 'Menlo', 'Cascadia Mono', 'Consolas', monospace;

    --fs-xs:   0.6875rem;
    --fs-sm:   0.8125rem;
    --fs-base: 0.9375rem;
    --fs-md:   1.0625rem;
    --fs-lg:   1.25rem;
    --fs-xl:   1.5rem;
    --fs-2xl:  1.75rem;

    --lh-tight:  1.2;
    --lh-normal: 1.5;

    /* --- Motion --- */
    --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --dur-fast:    100ms;
    --dur-normal:  200ms;
    --dur-slow:    350ms;
}

/* ---------- Body ---------- */
body {
    font-family: var(--font-family);
    background: var(--bg-deep);
    background-image:
        radial-gradient(ellipse 120% 60% at 50% 0%, rgba(56, 189, 248, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 80% 50% at 50% 100%, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: var(--sp-4);
    padding-top: max(var(--sp-4), env(safe-area-inset-top, 0px));
    color: var(--text-primary);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: var(--lh-normal);
}

/* ---------- Container ---------- */
.container {
    max-width: 440px;
    width: 100%;
    margin: 0 auto;
    background: var(--surface-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-card);
    padding: var(--sp-5);
    backdrop-filter: blur(40px) saturate(1.4);
    -webkit-backdrop-filter: blur(40px) saturate(1.4);
}

/* ---------- Header ---------- */
header {
    text-align: center;
    margin-bottom: var(--sp-5);
    padding-bottom: var(--sp-4);
    border-bottom: 1px solid var(--border-subtle);
}

h1 {
    font-size: var(--fs-lg);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: var(--lh-tight);
}

.subtitle {
    color: var(--text-secondary);
    font-size: var(--fs-sm);
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-top: 2px;
}

/* ---------- Action Buttons ---------- */
.controls {
    margin-bottom: var(--sp-4);
}

.action-buttons {
    display: flex;
    gap: var(--sp-3);
    justify-content: center;
}

.action-btn {
    flex: 1;
    max-width: 160px;
    padding: 10px var(--sp-5);
    font-size: var(--fs-sm);
    font-weight: 600;
    font-family: var(--font-family);
    border: 1px solid var(--border-medium);
    background: var(--surface-glass);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--dur-normal) var(--ease-out);
    touch-action: manipulation;
    color: var(--text-primary);
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.20);
}

.action-btn:active {
    transform: scale(0.95);
    background: rgba(255, 255, 255, 0.06);
}

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

/* ---------- Info Panel ---------- */
.info-panel {
    margin-bottom: var(--sp-4);
    padding: var(--sp-3);
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.ships-and-stats {
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

/* --- Ship Icons --- */
.ship-icons {
    display: flex;
    justify-content: center;
    gap: 6px;
    flex-wrap: wrap;
}

.ship-icon {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px 10px 3px 6px;
    background: var(--surface-glass);
    border-radius: var(--radius-pill);
    font-size: 1.125rem;
    cursor: default;
    transition: all var(--dur-slow) var(--ease-out);
    line-height: 1;
    border: 1px solid var(--border-subtle);
}

.ship-icon sub {
    font-size: 0.625rem;
    font-weight: 700;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    position: relative;
    bottom: -1px;
}

.ship-icon.sunk {
    opacity: 0.25;
    filter: grayscale(1) brightness(0.7);
    background: transparent;
    border-color: transparent;
    transform: scale(0.88);
}

/* --- Stats Row --- */
.stats-row {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.stat-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-1);
    padding: 4px var(--sp-3);
    background: var(--surface-glass);
    border-radius: var(--radius-pill);
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
    font-family: var(--font-family);
    border: 1px solid var(--border-subtle);
    min-width: 64px;
    justify-content: center;
    white-space: nowrap;
}

.stat-chip.hit-stat {
    background: rgba(244, 63, 94, 0.15);
    color: #fb7185;
    border-color: rgba(244, 63, 94, 0.20);
}

/* ---------- Board ---------- */
.board-container {
    margin-bottom: var(--sp-4);
}

.board-header {
    display: grid;
    grid-template-columns: 24px repeat(10, 1fr);
    gap: var(--grid-gap);
    margin-bottom: var(--grid-gap);
}

.col-label {
    text-align: center;
    font-weight: 600;
    font-size: 0.5625rem;
    color: var(--text-tertiary);
    padding: 2px 0;
    font-family: var(--font-mono);
    text-transform: uppercase;
}

.board-with-labels {
    display: grid;
    grid-template-columns: 24px 1fr;
    gap: var(--grid-gap);
}

.row-labels {
    display: grid;
    grid-template-rows: repeat(10, 1fr);
    gap: var(--grid-gap);
}

.row-label {
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.5625rem;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.board {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    gap: var(--grid-gap);
    background: rgba(255, 255, 255, 0.02);
    padding: var(--grid-gap);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    aspect-ratio: 1;
}

/* ---------- Cell ---------- */
.cell {
    background: var(--cell-bg);
    border: 1px solid var(--cell-border);
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition:
        background-color var(--dur-normal) var(--ease-out),
        transform var(--dur-fast) var(--ease-out),
        box-shadow var(--dur-normal) var(--ease-out),
        border-color var(--dur-normal) var(--ease-out),
        opacity var(--dur-normal) var(--ease-out);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.5625rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    position: relative;
    touch-action: manipulation;
    user-select: none;
    min-height: 0;
    overflow: hidden;
}

.cell:active:not(.hit):not(.miss) {
    transform: scale(0.85);
}

.cell:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
    z-index: 2;
}

/* ---------- Hit ---------- */
.cell.hit {
    background: var(--hit-bg);
    border-color: transparent;
    box-shadow: var(--glow-hit);
}

.cell.hit::after {
    content: '';
    width: 40%;
    height: 40%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.90);
}

.cell.hit.sunk {
    background: var(--sunk-bg);
    border-color: transparent;
    box-shadow: none;
}

.cell.hit.sunk::after {
    content: '\2715';
    width: auto;
    height: auto;
    border-radius: 0;
    background: none;
    font-size: 0.625rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.45);
    font-family: var(--font-family);
}

/* ---------- Miss ---------- */
.cell.miss {
    background: var(--miss-bg);
    border-color: transparent;
}

.cell.miss::after {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--miss-dot);
}

/* ---------- Probability Levels ---------- */
.cell.probability {
    font-weight: 600;
}

.cell.prob-0 { background: var(--prob-0); color: var(--text-tertiary); }
.cell.prob-1 { background: var(--prob-1); color: rgba(56, 189, 248, 0.60); }
.cell.prob-2 { background: var(--prob-2); color: rgba(56, 189, 248, 0.80); }
.cell.prob-3 { background: var(--prob-3); color: rgba(255, 255, 255, 0.85); }
.cell.prob-4 { background: var(--prob-4); color: rgba(255, 255, 255, 0.90); }
.cell.prob-5 { background: var(--prob-5); color: rgba(255, 255, 255, 0.95); }
.cell.prob-6 { background: var(--prob-6); color: #ffffff; }

/* ---------- Best Target ---------- */
.cell.best-target {
    animation: bestGlow 2s ease-in-out infinite;
    z-index: 1;
    border-color: rgba(56, 189, 248, 0.50);
}

/* ---------- Legend ---------- */
.legend {
    margin-bottom: var(--sp-3);
    padding: var(--sp-3);
    border-radius: var(--radius-md);
}

.legend h3 {
    font-size: 0.625rem;
    font-weight: 600;
    margin-bottom: var(--sp-2);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.legend-items {
    display: flex;
    gap: var(--sp-4);
    flex-wrap: wrap;
    align-items: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--fs-sm);
    color: var(--text-secondary);
}

.legend-color {
    width: 20px;
    height: 12px;
    border-radius: 3px;
    flex-shrink: 0;
}

.legend-color.legend-hit {
    background: var(--hit-bg);
    box-shadow: 0 0 8px var(--hit-glow);
    position: relative;
}
.legend-color.legend-hit::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.90);
}

.legend-color.legend-miss {
    background: var(--miss-bg);
    position: relative;
}
.legend-color.legend-miss::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--miss-dot);
}

.probability-gradient {
    background: linear-gradient(to right,
        var(--prob-1), var(--prob-3), var(--prob-5), var(--prob-6));
    width: 48px;
}

/* ---------- Footer ---------- */
footer {
    text-align: center;
    padding-top: var(--sp-3);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    font-size: var(--fs-xs);
    line-height: var(--lh-normal);
}

/* ---------- Responsive ---------- */
@media (min-width: 480px) {
    body { padding: var(--sp-6); }
    .container { max-width: 480px; padding: var(--sp-6); }
    h1 { font-size: var(--fs-xl); }
    .cell { font-size: 0.625rem; }
}

@media (min-width: 768px) {
    .container { max-width: 520px; padding: var(--sp-8); }
    h1 { font-size: var(--fs-2xl); }
}

/* ---------- Animations ---------- */
@keyframes bestGlow {
    0%, 100% {
        box-shadow: 0 0 8px var(--accent-glow), 0 0 2px var(--accent-glow);
    }
    50% {
        box-shadow: 0 0 20px var(--accent-glow), 0 0 6px var(--accent-glow);
    }
}

@keyframes hitPop {
    0%   { transform: scale(0.4); opacity: 0; }
    60%  { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes missFade {
    from { opacity: 0; transform: scale(0.8); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes sunkShake {
    0%, 100% { transform: translateX(0); }
    25%  { transform: translateX(-2px); }
    75%  { transform: translateX(2px); }
}

@keyframes modalSlideIn {
    from { transform: translateY(20px) scale(0.98); opacity: 0; }
    to   { transform: translateY(0) scale(1); opacity: 1; }
}

.cell.hit       { animation: hitPop var(--dur-slow) var(--ease-spring); }
.cell.miss      { animation: missFade var(--dur-normal) var(--ease-out); }
.cell.hit.sunk  { animation: sunkShake 0.35s var(--ease-out); }

/* Hover (desktop) */
@media (hover: hover) {
    .cell:hover:not(.hit):not(.miss) {
        background: rgba(56, 189, 248, 0.10);
        border-color: rgba(56, 189, 248, 0.25);
        transform: scale(1.08);
        z-index: 1;
    }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .cell.best-target {
        animation: none;
        box-shadow: 0 0 0 2px var(--accent);
    }
}

/* ---------- Modal ---------- */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--surface-overlay);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(12px) saturate(1.2);
    -webkit-backdrop-filter: blur(12px) saturate(1.2);
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--surface-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-2xl);
    padding: var(--sp-6);
    max-width: 360px;
    width: 88%;
    box-shadow: var(--shadow-modal);
    animation: modalSlideIn var(--dur-slow) var(--ease-out);
    backdrop-filter: blur(40px) saturate(1.4);
    -webkit-backdrop-filter: blur(40px) saturate(1.4);
}

.modal-content h2 {
    margin-bottom: var(--sp-2);
    color: var(--text-primary);
    font-size: var(--fs-lg);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.modal-content p {
    margin-bottom: var(--sp-5);
    color: var(--text-secondary);
    font-size: var(--fs-base);
    line-height: var(--lh-normal);
}

.modal-buttons {
    display: flex;
    gap: var(--sp-3);
}

.modal-btn {
    flex: 1;
    padding: var(--sp-3);
    font-size: var(--fs-base);
    font-weight: 600;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--dur-normal) var(--ease-out);
    touch-action: manipulation;
    line-height: 1.4;
}

.modal-btn.primary {
    background: var(--accent);
    color: var(--text-inverse);
    box-shadow: var(--glow-accent);
}

.modal-btn.primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.modal-btn.primary:active {
    transform: scale(0.96);
}

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

.modal-btn.secondary {
    background: var(--surface-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

.modal-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.08);
}

.modal-btn.secondary:active {
    transform: scale(0.96);
}

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

.modal-btn.cancel-btn {
    width: 100%;
    margin-top: var(--sp-3);
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    padding: var(--sp-2);
    font-size: var(--fs-sm);
}

.modal-btn.cancel-btn:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.modal-content #selectedCoord {
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: var(--fs-md);
}

/* ---------- Ship Select ---------- */
.ship-select-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

.ship-select-btn {
    padding: var(--sp-3) var(--sp-4);
    font-size: var(--fs-base);
    font-weight: 600;
    font-family: var(--font-family);
    background: var(--surface-glass);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--dur-normal) var(--ease-out);
    display: flex;
    justify-content: space-between;
    align-items: center;
    touch-action: manipulation;
    color: var(--text-primary);
}

.ship-select-btn:hover {
    border-color: var(--accent);
    background: var(--accent-subtle);
}

.ship-select-btn:active {
    transform: scale(0.98);
}

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

.ship-select-btn .ship-info {
    display: flex;
    gap: var(--sp-2);
    align-items: center;
}

.ship-select-btn .ship-emoji {
    font-size: 1.125rem;
    line-height: 1;
}

.ship-select-btn .ship-length {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    font-weight: 400;
}