:root {
    --bg-base: #eef4ff;
    --bg-accent: #ffe4cc;
    --surface: rgba(255, 255, 255, 0.78);
    --surface-solid: #ffffff;
    --text-main: #0d233f;
    --text-muted: #54657a;
    --border: rgba(13, 35, 63, 0.12);
    --primary: #206ec7;
    --primary-hover: #1759a6;
    --primary-strong: #11a9d8;
    --secondary: #f1f7ff;
    --secondary-hover: #e8f2ff;
    --icon-active: #d9ecff;
    --primary-shadow: rgba(24, 105, 191, 0.32);
    --shadow: 0 20px 45px rgba(13, 35, 63, 0.13);
    --focus-ring: rgba(25, 92, 168, 0.16);
    --status-error: #b0283f;
    --radius: 18px;
    --glow-1: rgba(44, 123, 211, 0.22);
    --glow-2: rgba(255, 152, 94, 0.34);
    --glow-3: rgba(57, 193, 215, 0.2);
    --hero-gradient: linear-gradient(130deg, #1b6dcb 0%, #18b5d7 50%, #ff9c5b 100%);
    --card-tint: linear-gradient(145deg, rgba(255, 255, 255, 0.8), rgba(231, 244, 255, 0.6));
    --metric-1: linear-gradient(145deg, #eef8ff, #dff0ff);
    --metric-2: linear-gradient(145deg, #f3efff, #e9e1ff);
    --metric-3: linear-gradient(145deg, #fff3ea, #ffe8d7);
    --metric-4: linear-gradient(145deg, #e8f9f2, #d8f2e8);
}

:root[data-theme="dark"] {
    --bg-base: #0b1220;
    --bg-accent: #152a4a;
    --surface: rgba(17, 30, 49, 0.78);
    --surface-solid: #122338;
    --text-main: #e8f0ff;
    --text-muted: #9eb3cc;
    --border: rgba(158, 179, 204, 0.2);
    --primary: #6cb3ff;
    --primary-hover: #87c2ff;
    --primary-strong: #4fd2ff;
    --secondary: #1a2c45;
    --secondary-hover: #233a5a;
    --icon-active: #1f4473;
    --primary-shadow: rgba(79, 145, 223, 0.26);
    --shadow: 0 20px 45px rgba(0, 0, 0, 0.42);
    --focus-ring: rgba(108, 179, 255, 0.3);
    --status-error: #ff94a1;
    --glow-1: rgba(56, 139, 253, 0.22);
    --glow-2: rgba(79, 106, 255, 0.24);
    --glow-3: rgba(45, 216, 255, 0.2);
    --hero-gradient: none;
    --card-tint: none;
    --metric-1: var(--surface-solid);
    --metric-2: var(--surface-solid);
    --metric-3: var(--surface-solid);
    --metric-4: var(--surface-solid);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Manrope", sans-serif;
    color: var(--text-main);
    background: linear-gradient(150deg, var(--bg-base) 30%, var(--bg-accent) 100%);
    transition: background 220ms ease, color 220ms ease;
}

.background-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        radial-gradient(circle at 16% 22%, var(--glow-1), transparent 30%),
        radial-gradient(circle at 84% 15%, var(--glow-2), transparent 34%),
        radial-gradient(circle at 82% 80%, var(--glow-3), transparent 28%),
        repeating-linear-gradient(
            -35deg,
            transparent 0 36px,
            rgba(15, 88, 170, 0.04) 36px 40px
        );
    z-index: -1;
    transition: background-image 220ms ease;
}

.container {
    width: min(1100px, calc(100% - 2rem));
    margin-inline: auto;
}

.site-header {
    padding: 3.5rem 0 2rem;
}

.header-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.6rem;
}

.eyebrow {
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 700;
}

h1,
h2,
h3 {
    font-family: "Space Grotesk", sans-serif;
    margin: 0;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

h1 {
    margin-top: 0.45rem;
    font-size: clamp(2rem, 4vw, 3.2rem);
}

:root:not([data-theme="dark"]) h1 {
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.subtitle {
    margin: 0.75rem 0 0;
    color: var(--text-muted);
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    max-width: 52ch;
}

.layout {
    display: grid;
    gap: 1.2rem;
    grid-template-columns: repeat(12, 1fr);
    padding-bottom: 2rem;
}

.card {
    background: var(--surface);
    background-image: var(--card-tint);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    backdrop-filter: blur(6px);
    padding: 1.35rem;
    animation: riseIn 420ms ease both;
    transition: background 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.controls {
    grid-column: span 4;
}

.results {
    grid-column: span 8;
}

.history {
    grid-column: span 12;
}

.card h2 {
    font-size: 1.25rem;
}

.roll-form {
    margin-top: 1rem;
    display: grid;
    gap: 1rem;
}

.roll-form.is-rolling {
    opacity: 0.86;
}

.field-group {
    display: grid;
    gap: 0.55rem;
}

label {
    font-weight: 700;
}

input[type="number"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 0.8rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-main);
    background: var(--surface-solid);
    transition: border-color 180ms ease, box-shadow 180ms ease, background 220ms ease, color 220ms ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--focus-ring);
}

.help-text {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.btn,
.icon-btn {
    border-radius: 12px;
    padding: 0.7rem 1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.btn {
    border: 0;
}

.btn:active,
.icon-btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-strong));
    color: #ffffff;
    box-shadow: 0 12px 22px var(--primary-shadow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary));
}

.btn-secondary {
    background: var(--secondary);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--secondary-hover);
}

.icon-btn {
    border: 1px solid var(--border);
    background: var(--surface-solid);
    color: var(--text-main);
    min-width: 114px;
}

.icon-btn:hover {
    border-color: var(--primary);
}

.icon-btn[aria-pressed="true"] {
    border-color: var(--primary);
    background: var(--icon-active);
}

.status-message {
    min-height: 1.3em;
    margin: 0.9rem 0 0;
    color: var(--text-muted);
    font-weight: 600;
}

.status-message.is-error {
    color: var(--status-error);
}

.metrics {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.65rem;
}

.metric {
    margin: 0;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--surface-solid);
    padding: 0.85rem;
    transition: background 220ms ease, border-color 220ms ease;
}

.metric:nth-child(1) {
    background: var(--metric-1);
}

.metric:nth-child(2) {
    background: var(--metric-2);
}

.metric:nth-child(3) {
    background: var(--metric-3);
}

.metric:nth-child(4) {
    background: var(--metric-4);
}

:root[data-theme="dark"] .background-layer {
    background-image:
        radial-gradient(circle at 16% 22%, var(--glow-1), transparent 30%),
        radial-gradient(circle at 84% 15%, var(--glow-2), transparent 34%),
        radial-gradient(circle at 82% 80%, var(--glow-3), transparent 28%);
}

.metric-label {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.84rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.metric-value {
    margin: 0.2rem 0 0;
    font-weight: 800;
    font-size: 1.4rem;
}

.dice-grid {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: 0.65rem;
}

.dice-item {
    background: var(--surface-solid);
    border: 1px solid var(--border);
    border-radius: 14px;
    text-align: center;
    padding: 0.7rem;
    box-shadow: 0 10px 24px rgba(13, 35, 63, 0.08);
    transition: background 220ms ease, border-color 220ms ease;
}

.dice-item img {
    width: 56px;
    height: 56px;
    object-fit: contain;
}

.dice-item p {
    margin: 0.35rem 0 0;
    font-weight: 700;
}

.dice-grid.is-rolling .dice-item {
    animation: diceShuffle 460ms cubic-bezier(0.42, 0, 0.58, 1) infinite;
}

.dice-grid.is-rolling .dice-item:nth-child(2n) {
    animation-delay: 80ms;
}

.dice-grid.is-rolling .dice-item:nth-child(3n) {
    animation-delay: 130ms;
}

.dice-grid.is-rolling .dice-item img {
    filter: saturate(1.08) contrast(1.04);
}

.dice-grid.is-reveal .dice-item {
    animation: diceReveal 520ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
    animation-delay: calc(var(--reveal-delay) * 42ms);
}

.share-section {
    margin-top: 1.1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.share-section h3 {
    font-size: 1.08rem;
}

.share-card-preview {
    margin-top: 0.75rem;
    padding: 1rem;
    border-radius: 14px;
    border: 1px solid var(--border);
    background:
        radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.2), transparent 38%),
        linear-gradient(135deg, var(--primary), var(--primary-strong));
    color: #ffffff;
    box-shadow: 0 14px 28px var(--primary-shadow);
}

:root[data-theme="dark"] .share-card-preview {
    background:
        radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.08), transparent 38%),
        linear-gradient(135deg, #1e3355, #164974);
}

.share-kicker {
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.11em;
    font-size: 0.77rem;
    opacity: 0.9;
}

.share-total {
    margin: 0.4rem 0 0;
    font-size: 1.3rem;
    font-weight: 800;
}

.share-values {
    margin: 0.42rem 0 0;
    font-weight: 700;
}

.share-meta {
    margin: 0.4rem 0 0;
    opacity: 0.9;
    font-size: 0.92rem;
}

.share-actions {
    margin-top: 0.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.share-actions .btn {
    flex: 1;
    min-width: 140px;
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.history-list {
    margin: 1rem 0 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 0.6rem;
}

.history-item {
    color: var(--text-main);
    font-weight: 600;
}

.history-meta {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-left: 0.4rem;
}

.history-empty {
    list-style: none;
    margin-left: -1.1rem;
    color: var(--text-muted);
}

.site-footer {
    padding: 0.7rem 0 2rem;
    color: var(--text-muted);
    font-weight: 600;
}

@keyframes riseIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulseDice {
    0% {
        transform: scale(0.95);
    }
    50% {
        transform: scale(1.04);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes diceShuffle {
    0% {
        transform: translateY(0) rotate(0deg) scale(1);
    }
    25% {
        transform: translateY(-5px) rotate(-6deg) scale(1.05);
    }
    50% {
        transform: translateY(3px) rotate(7deg) scale(0.97);
    }
    75% {
        transform: translateY(-3px) rotate(-5deg) scale(1.03);
    }
    100% {
        transform: translateY(0) rotate(0deg) scale(1);
    }
}

@keyframes diceReveal {
    0% {
        opacity: 0;
        transform: translateY(12px) scale(0.86) rotate(-8deg);
    }
    60% {
        opacity: 1;
        transform: translateY(-3px) scale(1.04) rotate(3deg);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1) rotate(0deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .dice-grid.is-rolling .dice-item,
    .dice-grid.is-reveal .dice-item {
        animation: none;
    }
}

@media (max-width: 980px) {
    .controls,
    .results,
    .history {
        grid-column: span 12;
    }

    .header-row {
        flex-direction: column;
    }

    .toolbar {
        justify-content: flex-start;
    }
}

@media (max-width: 640px) {
    .site-header {
        padding-top: 2.4rem;
    }

    .metrics {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .card {
        padding: 1.1rem;
    }

    .toolbar {
        width: 100%;
    }

    .icon-btn {
        flex: 1;
        min-width: 0;
    }

    :root:not([data-theme="dark"]) h1 {
        background-size: 150% 150%;
    }

    .share-actions .btn {
        min-width: 0;
    }
}