/* ==========================================================================
   Triggey – Dark Theme Stylesheet
   ========================================================================== */

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

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-card: #242836;
    --bg-input: #1e2230;
    --bg-hover: #2e3348;

    --accent: #7c6aef;
    --accent-hover: #9585f5;
    --accent-glow: rgba(124, 106, 239, 0.25);

    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.1);

    --error: #f87171;
    --error-bg: rgba(248, 113, 113, 0.1);

    --text-primary: #e8eaf0;
    --text-secondary: #9ca3b4;
    --text-muted: #5f6678;

    --border: #2e3348;
    --border-focus: #7c6aef;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--accent-glow);

    --font-main:
        "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;

    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---------- Layout ---------- */

.container {
    width: 100%;
    max-width: 560px;
    margin: 0 auto;
    padding: 24px 20px 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-height: 100dvh;
}

header {
    text-align: center;
}

.logo-svg {
    display: block;
    width: 100%;
    max-width: 420px;
    height: auto;
    margin: 0 auto;
}

.subtitle {
    margin-top: 6px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.subtitle .math {
    font-weight: 600;
    color: var(--accent-hover);
    letter-spacing: 0.08em;
}

main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

footer {
    text-align: center;
    padding-top: 8px;
}

footer p {
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

/* ---------- Puzzle Date ---------- */

.puzzle-date {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* ---------- Puzzle Info ---------- */

.puzzle-info {
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent);
    padding: 14px 16px;
    border-radius: var(--radius-md);
    min-height: 56px;
}

.puzzle-info h3 {
    margin-bottom: 6px;
    color: var(--accent-hover);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.puzzle-info p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.5;
}

.puzzle-info-skeleton {
    width: 70%;
    height: 20px;
    border-radius: var(--radius-sm);
}

.puzzle-info .formula {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-hover);
    margin-top: 6px;
    opacity: 0.85;
}

/* ---------- Triangle Display ---------- */

.triangle-display {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 8px;
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition);
}

.triangle-display.celebrate {
    animation: celebrate-pulse 0.6s ease;
}

.puzzle-svg {
    width: 100%;
    height: auto;
    display: block;
}

@keyframes celebrate-pulse {
    0%   { border-color: var(--border); box-shadow: var(--shadow-md); }
    40%  { border-color: var(--success); box-shadow: 0 0 20px rgba(52, 211, 153, 0.3); }
    100% { border-color: var(--border); box-shadow: var(--shadow-md); }
}

/* ---------- Given Values ---------- */

.given-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
}

.value-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: var(--radius-md);
    text-align: center;
    transition: border-color var(--transition);
}

.value-item:hover {
    border-color: var(--accent);
}

.value-label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.value-content {
    display: block;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--accent-hover);
    font-family: var(--font-mono);
    word-break: break-word;
}

/* ---------- Form & Input ---------- */

#solve-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group {
    display: flex;
    gap: 8px;
    align-items: stretch;
}

#answer {
    flex: 1;
    padding: 14px 16px;
    font-size: 1.05rem;
    font-family: var(--font-mono);
    color: var(--text-primary);
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    outline: none;
    min-width: 0;
    transition:
        border-color var(--transition),
        box-shadow var(--transition);
}

#answer::placeholder {
    color: var(--text-muted);
    font-family: var(--font-main);
    font-size: 0.88rem;
}

#answer:focus {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-glow);
}

.answer-unit {
    display: flex;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    padding: 0 4px;
}

#submit-btn {
    padding: 14px 22px;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    white-space: nowrap;
    transition:
        background var(--transition),
        transform var(--transition),
        box-shadow var(--transition),
        opacity var(--transition);
}

#submit-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

#submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

#submit-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#submit-btn.loading {
    position: relative;
    color: transparent;
}

#submit-btn.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin: -9px 0 0 -9px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ---------- Feedback ---------- */

.feedback {
    min-height: 0;
    overflow: hidden;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.feedback:empty {
    padding: 0;
    margin: 0;
}

.feedback.success {
    padding: 14px 18px;
    color: var(--success);
    background: var(--success-bg);
    border: 1px solid rgba(52, 211, 153, 0.25);
    animation: feedback-appear 0.3s ease;
}

.feedback.error {
    padding: 14px 18px;
    color: var(--error);
    background: var(--error-bg);
    border: 1px solid rgba(248, 113, 113, 0.25);
    animation: feedback-appear 0.3s ease;
}

@keyframes feedback-appear {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Solutions Count ---------- */

.solutions-count {
    text-align: center;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.solutions-count strong {
    color: var(--accent-hover);
    font-weight: 700;
}

/* ---------- Scratchpad ---------- */

.scratchpad-details {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.scratchpad-details summary {
    padding: 12px 16px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    list-style: none;
    transition: color var(--transition);
}

.scratchpad-details summary::-webkit-details-marker { display: none; }

.scratchpad-details summary::before {
    content: "📝 ";
    opacity: 0.6;
}

.scratchpad-details summary:hover { color: var(--text-primary); }

.scratchpad-wrap { padding: 0 16px 14px; }

.scratchpad-wrap textarea {
    width: 100%;
    min-height: 100px;
    max-height: 400px;
    padding: 12px 14px;
    font-size: 0.9rem;
    font-family: var(--font-mono);
    color: var(--text-primary);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    resize: vertical;
    line-height: 1.6;
    transition: border-color var(--transition);
}

.scratchpad-wrap textarea:focus { border-color: var(--border-focus); }
.scratchpad-wrap textarea::placeholder { color: var(--text-muted); }

/* ---------- Player Details ---------- */

.player-details {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.player-details summary {
    padding: 12px 16px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    list-style: none;
    transition: color var(--transition);
}

.player-details summary::-webkit-details-marker { display: none; }

.player-details summary::before {
    content: "⚙ ";
    opacity: 0.6;
}

.player-details summary:hover { color: var(--text-primary); }

.player-input-wrap {
    display: flex;
    gap: 10px;
    padding: 0 16px 14px;
}

.player-input-wrap input {
    flex: 1;
    padding: 10px 14px;
    font-size: 0.9rem;
    color: var(--text-primary);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition);
}

.player-input-wrap input:focus { border-color: var(--border-focus); }
.player-input-wrap input::placeholder { color: var(--text-muted); }

.player-input-wrap button {
    padding: 10px 18px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
}

.player-input-wrap button:hover { background: var(--accent-hover); }

/* ---------- Skeleton ---------- */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-card) 25%,
        var(--bg-hover) 50%,
        var(--bg-card) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-pulse 1.5s ease-in-out infinite;
    color: transparent !important;
    border-radius: var(--radius-sm);
}

@keyframes skeleton-pulse {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ---------- Yesterday Section ---------- */

.yesterday-section {
    border-top: 1px solid var(--border);
    padding-top: 8px;
}

.yesterday-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 4px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--transition);
}

.yesterday-toggle:hover { color: var(--text-primary); }

.yesterday-toggle-icon {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.yesterday-toggle.open .yesterday-toggle-icon {
    transform: rotate(180deg);
}

.yesterday-content {
    display: none;
    flex-direction: column;
    gap: 12px;
    padding-bottom: 8px;
}

.yesterday-toggle.open + .yesterday-content {
    display: flex;
    animation: slide-down 0.3s ease;
}

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

.yesterday-header {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    letter-spacing: 0.02em;
}

.yesterday-puzzle {
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent);
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.yesterday-puzzle strong {
    display: block;
    color: var(--accent-hover);
    margin-bottom: 4px;
    font-size: 0.9rem;
}

.yesterday-answer {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-hover);
    padding: 8px 0;
}

.yesterday-answer .answer-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    display: block;
    margin-bottom: 4px;
}

.yesterday-answer .answer-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
}

.yesterday-solvers-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: center;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.yesterday-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.loading-text {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    padding: 12px 0;
}

.no-solutions {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    padding: 16px 0;
    font-style: italic;
}

.solution-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    gap: 12px;
}

.solution-player {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.solution-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

.load-more-btn {
    width: 100%;
    padding: 12px;
    margin-top: 4px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent-hover);
    background: var(--bg-secondary);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition:
        background var(--transition),
        border-color var(--transition),
        color var(--transition);
}

.load-more-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    color: var(--text-primary);
}

.load-more-btn:active { transform: scale(0.98); }

/* ---------- Responsive ---------- */

@media (max-width: 380px) {
    .container { padding: 16px 14px 32px; gap: 18px; }
    header h1 { font-size: 1.6rem; }
    .given-values { grid-template-columns: 1fr 1fr; }
    #answer { padding: 12px 14px; font-size: 0.95rem; }
    #submit-btn { padding: 12px 16px; font-size: 0.9rem; }
}

@media (min-width: 600px) {
    .container { padding: 40px 24px 60px; gap: 28px; }
    header h1 { font-size: 2.4rem; }
    .given-values { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
}

@media (min-height: 750px) {
    .container { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}