/* TenSum — skinned to the Skorven portal design system.
   Background matches the wrapper's .board gradient (TenSum accent #FF8A3D)
   so the iframe is seamless. Numbers use a cold→hot ramp: low = cool blues,
   high = warm oranges/reds, so values can be scanned at a glance. */
:root {
    --bg-deep: #101218;
    --accent: #FF8A3D;
    --accent-ink: #2A1508;
    --green: #2BD67B;
    --red: #FF4D5E;
    --amber: #FFB23D;
    --text-primary: #F4F5F7;
    --text-muted: #9097A3;
    --text-faint: #7E8595;
    --panel-grad: linear-gradient(180deg, #181B23, #131519);
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.15);
    --font-disp: 'Bricolage Grotesque', 'Space Grotesk', sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'Space Mono', monospace;

    /* Number colors — cold (low) → hot (high) */
    --color-1: #6FB7FF;
    --color-2: #4FD6C4;
    --color-3: #2BD67B;
    --color-4: #A8D94F;
    --color-5: #FFD84D;
    --color-6: #FFB23D;
    --color-7: #FF8A3D;
    --color-8: #FF6A3D;
    --color-9: #FF4D5E;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-user-select: none;
}

body {
    background:
        radial-gradient(80% 90% at 50% 18%, rgba(255, 138, 61, 0.12), rgba(0, 0, 0, 0) 70%),
        linear-gradient(180deg, #15171F, #101218);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Header (standalone page only — hidden when embedded) */
header {
    text-align: center;
    padding: 1.4rem 1rem 0.4rem;
}

.logo {
    font-family: var(--font-disp);
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    display: inline-block;
}
.logo-dot { color: var(--accent); }

.tagline {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-faint);
    letter-spacing: 0.22em;
    text-transform: uppercase;
    margin-top: 0.15rem;
}

/* Layout container */
.game-container {
    max-width: 1100px;
    width: 100%;
    margin: auto;
    padding: 1rem;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    gap: 1.25rem;
    flex-grow: 1;
}

/* Panels */
.side-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 210px;
    flex-shrink: 0;
}

.panel-card {
    background: var(--panel-grad);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 1.1rem 1.25rem;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 14px 32px rgba(0, 0, 0, 0.38);
    text-align: center;
}

.panel-card h2 {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-faint);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 0.55rem;
}
.panel-card h2.stat-gap { margin-top: 1.1rem; }

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--text-primary);
}
.stat-value.stat-sub {
    font-size: 1.25rem;
    color: var(--accent);
}
.stat-note {
    font-size: 0.72rem;
    color: var(--text-faint);
    margin-top: 0.3rem;
}

/* Combo Progress Bar */
.progress-bar-container {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 3px;
    margin-top: 0.7rem;
    overflow: hidden;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--amber), var(--accent));
    border-radius: 3px;
    transition: width 0.1s linear;
}

/* Board Wrapper */
.board-wrapper {
    position: relative;
    border-radius: 18px;
    background: linear-gradient(180deg, #14161E, #0F1116);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), inset 0 0 60px rgba(255, 138, 61, 0.05), 0 22px 48px rgba(0, 0, 0, 0.45);
    border: 1px solid rgba(255, 138, 61, 0.22);
    padding: 8px;
    flex-grow: 0;
    max-width: 520px;
    width: 100%;
    aspect-ratio: 1 / 1;
    touch-action: none;
}

/* 10x10 Grid Board */
.grid-board {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    gap: 4px;
    width: 100%;
    height: 100%;
}

/* Grid Cells */
.cell {
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 7px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
    position: relative;
}

.cell:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: var(--line-strong);
}

/* Color mappings for numbers (cold → hot) */
.num-1 { color: var(--color-1); }
.num-2 { color: var(--color-2); }
.num-3 { color: var(--color-3); }
.num-4 { color: var(--color-4); }
.num-5 { color: var(--color-5); }
.num-6 { color: var(--color-6); }
.num-7 { color: var(--color-7); }
.num-8 { color: var(--color-8); text-shadow: 0 0 10px rgba(255, 106, 61, 0.35); }
.num-9 { color: var(--color-9); text-shadow: 0 0 10px rgba(255, 77, 94, 0.35); }

/* Popped / 0 cell style — a sunken empty socket */
.num-0 {
    color: transparent;
    background: rgba(0, 0, 0, 0.32);
    border-style: dashed;
    border-color: rgba(255, 255, 255, 0.05);
}

.num-0::after {
    content: "";
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.07);
    position: absolute;
}

/* Selection Highlight States */
.cell.selected {
    background: rgba(255, 138, 61, 0.16);
    border-color: rgba(255, 138, 61, 0.75);
    transform: scale(0.96);
}

/* Live validity tint: green = exactly 10 (release!), red = overshot */
.cell.selected.selected-valid {
    background: rgba(43, 214, 123, 0.20);
    border-color: var(--green);
    box-shadow: inset 0 0 10px rgba(43, 214, 123, 0.22);
}
.cell.selected.selected-over {
    background: rgba(255, 77, 94, 0.16);
    border-color: rgba(255, 77, 94, 0.75);
}

/* Selected boundary borders to outline the selected box */
.cell.selected-top { border-top-width: 2px; }
.cell.selected-bottom { border-bottom-width: 2px; }
.cell.selected-left { border-left-width: 2px; }
.cell.selected-right { border-right-width: 2px; }

/* Pop and Clear animation */
.cell.pop-clear {
    animation: cellPop 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes cellPop {
    0% {
        transform: scale(1);
        background: rgba(43, 214, 123, 0.4);
        border-color: var(--green);
        box-shadow: 0 0 15px rgba(43, 214, 123, 0.6);
    }
    40% {
        transform: scale(1.15);
        background: rgba(43, 214, 123, 0.6);
        border-color: #fff;
    }
    100% {
        transform: scale(0);
        opacity: 0.3;
    }
}

/* Error Shake animation */
.cell.shake-error {
    animation: cellShake 0.4s ease-in-out;
}

@keyframes cellShake {
    0%, 100% { transform: translateX(0); }
    15%, 45%, 75% { transform: translateX(-4px); border-color: var(--red); background: rgba(255, 77, 94, 0.14); }
    30%, 60%, 90% { transform: translateX(4px); border-color: var(--red); background: rgba(255, 77, 94, 0.14); }
}

/* Hint pulse animation */
.cell.hint-pulse {
    animation: hintPulseAnim 1.1s infinite alternate;
}

@keyframes hintPulseAnim {
    0% {
        box-shadow: 0 0 4px rgba(255, 178, 61, 0.4);
        border-color: rgba(255, 178, 61, 0.35);
        background: rgba(255, 178, 61, 0.06);
    }
    100% {
        box-shadow: 0 0 14px rgba(255, 178, 61, 0.65);
        border-color: var(--amber);
        background: rgba(255, 178, 61, 0.18);
    }
}

/* Floating Sum Bubble — inside the board so it never clips in the iframe */
.sum-bubble {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    background: rgba(15, 17, 23, 0.92);
    border: 1px solid rgba(255, 138, 61, 0.55);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.35rem 0.95rem;
    border-radius: 999px;
    pointer-events: none;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.55);
    z-index: 5;
    opacity: 0;
    transition: opacity 0.15s, transform 0.15s;
}

.sum-bubble.active {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.sum-bubble.valid {
    border-color: var(--green);
    color: var(--green);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.55), 0 0 12px rgba(43, 214, 123, 0.3);
}

.sum-bubble.invalid {
    border-color: var(--red);
    color: var(--red);
}

/* Overlays inside Board Wrapper */
.overlay-screen {
    position: absolute;
    inset: 0;
    background: rgba(11, 13, 17, 0.78);
    backdrop-filter: blur(9px);
    -webkit-backdrop-filter: blur(9px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 2rem;
    text-align: center;
    border-radius: 17px;
}

.overlay-screen.active {
    opacity: 1;
    pointer-events: auto;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 10px;
}

.overlay-title {
    font-family: var(--font-disp);
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 0.9rem;
    line-height: 1.05;
}

.overlay-copy {
    color: var(--text-muted);
    margin-bottom: 1.4rem;
    max-width: 300px;
    line-height: 1.55;
    font-size: 0.9rem;
}
.overlay-copy strong { color: var(--accent); }

.overlay-stats {
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 0.9rem 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.overlay-stats span {
    color: var(--text-primary);
    font-weight: 700;
    font-family: var(--font-mono);
    margin-left: 0.4rem;
}

#newbest-note {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--amber);
    margin-bottom: 1rem;
}

/* Primary button (portal style) */
.btn-primary {
    background: var(--accent);
    border: none;
    color: var(--accent-ink);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 0.72rem 2.1rem;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 6px 22px rgba(255, 138, 61, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.35);
    transition: transform 0.16s, filter 0.16s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    filter: brightness(1.08);
}
.btn-primary:active { transform: translateY(0); }

/* Sidebar Action Buttons (portal ghost style) */
.btn-action {
    width: 100%;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--line);
    color: #C7CCD5;
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.65rem 1rem;
    border-radius: 11px;
    cursor: pointer;
    transition: all 0.18s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn-action + .btn-action { margin-top: 0.6rem; }

.btn-action:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.08);
    color: #EDEFF2;
    border-color: var(--line-strong);
}

.btn-action:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-action-warn:hover:not(:disabled) {
    border-color: rgba(255, 138, 61, 0.5);
    color: var(--accent);
}

.action-icon { font-size: 0.95rem; }

/* Settings Controls & Toggles */
.settings-wrap { width: 100%; max-width: 210px; margin: 0 auto 1.4rem; }
.settings-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: #23262F;
    transition: 0.3s;
    border-radius: 22px;
    border: 1px solid rgba(255, 255, 255, 0.07);
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: #8B92A0;
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: rgba(255, 138, 61, 0.22);
    border-color: rgba(255, 138, 61, 0.55);
}

input:checked + .slider:before {
    transform: translateX(22px);
    background-color: var(--accent);
}

/* Desktop Help Section */
.instructions-panel {
    max-width: 1100px;
    margin: 1.25rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    width: 100%;
}

.instruction-group {
    background: var(--panel-grad);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 1.1rem 1.25rem;
}

.instruction-group h3 {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 0.7rem;
    text-transform: uppercase;
}

.key-list {
    list-style: none;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.key-list li {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 0.38rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    line-height: 1.4;
}

.key-list li:last-child { border: none; }

.key-list span:last-child {
    color: var(--text-primary);
    font-weight: 500;
    text-align: right;
}

/* Footer */
footer {
    text-align: center;
    padding: 1.25rem;
    color: var(--text-faint);
    font-size: 0.78rem;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    margin-top: auto;
}
footer a { color: var(--accent); text-decoration: none; }

/* Screen Shake effect for incorrect match */
.shake {
    animation: shakeAnim 0.15s ease-in-out 2;
}

@keyframes shakeAnim {
    0% { transform: translate(0, 0); }
    25% { transform: translate(-4px, 3px); }
    50% { transform: translate(4px, -2px); }
    75% { transform: translate(-3px, -3px); }
    100% { transform: translate(0, 0); }
}

/* Responsive Rules */
@media (max-width: 900px) {
    .game-container {
        flex-direction: column;
        align-items: center;
        padding: 0.75rem;
        gap: 1rem;
    }

    .side-panel {
        width: 100%;
        max-width: 520px;
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .panel-card {
        flex: 1;
        min-width: 150px;
        padding: 0.85rem;
    }

    .panel-card h2 { margin-bottom: 0.3rem; }
    .panel-card h2.stat-gap { margin-top: 0.6rem; }
    .stat-value { font-size: 1.4rem; }

    #card-actions {
        display: flex;
        align-items: center;
        gap: 0.6rem;
    }
    #card-actions h2 { display: none; }
    .btn-action + .btn-action { margin-top: 0 !important; }

    .board-wrapper { max-width: 500px; }
    .cell { font-size: 1.2rem; }

    /* Board first on small screens, then stats, then actions */
    .board-wrapper { order: 0; }
    #left-side-panel { order: 1; }
    #right-side-panel { order: 2; }
}

@media (max-width: 500px) {
    .logo { font-size: 2rem; }

    #card-actions { flex-wrap: wrap; }

    .board-wrapper {
        border-radius: 14px;
        padding: 5px;
    }

    .grid-board { gap: 3px; }

    .cell {
        font-size: 1rem;
        border-radius: 5px;
    }

    .instructions-panel { display: none; /* Save space on mobile */ }
}

/* Embedded in the Skorven game player (iframe): hide standalone-page chrome
   so the game board fits the player frame. Direct/standalone view is unchanged. */
.embedded header,
.embedded footer,
.embedded .instructions-panel { display: none !important; }
.embedded .game-container { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.embedded body { background-attachment: scroll; }