/* ============================================
   Numbershop — cozy ultrafinitist art gallery
   ============================================ */

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

:root {
    --bg: #f7f3ee;
    --bg-alt: #f0ebe3;
    --text: #3d3425;
    --text-muted: #7a6f62;
    --brown: #8b7355;
    --green: #6b8e6b;
    --blue: #5b7fa5;
    --border: #d6cdbf;
    --shadow: rgba(78, 63, 43, 0.08);
    --highlight: rgba(215, 210, 140, 0.35);
    --highlight-green: rgba(140, 180, 140, 0.25);
    --error: #a67358;
    --card-bg: #fffdf9;
    --radius: 8px;
    --radius-lg: 12px;
}

html {
    font-size: 17px;
    scroll-behavior: smooth;
}

body {
    font-family: Georgia, 'Palatino Linotype', Palatino, 'Book Antiqua', serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-weight: 600;
    letter-spacing: 0.02em;
    line-height: 1.3;
    color: var(--text);
}

h1 { font-size: 1.8rem; margin-bottom: 0.6em; }
h2 { font-size: 1.35rem; margin-bottom: 0.5em; color: var(--brown); }
h3 { font-size: 1.1rem; margin-bottom: 0.4em; }

p {
    margin-bottom: 0.8em;
}

/* --- Links --- */
a {
    color: var(--brown);
    text-decoration: underline;
    text-decoration-color: rgba(139, 115, 85, 0.35);
    text-underline-offset: 2px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

a:hover {
    background-color: var(--highlight);
    color: var(--text);
    border-radius: 2px;
    text-decoration-color: var(--brown);
}

/* --- Header --- */
header {
    background-color: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 0.8rem 1.5rem;
}

header nav {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--brown);
    text-decoration: none;
}

.logo:hover {
    background-color: transparent;
    color: var(--green);
}

/* --- Main Content --- */
main {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
    flex: 1;
}

/* --- Footer --- */
footer {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 1.2rem 1.5rem;
    text-align: center;
}

footer p {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-style: italic;
    margin: 0;
    letter-spacing: 0.03em;
}

/* --- Welcome Section --- */
.welcome {
    text-align: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.welcome h1 {
    color: var(--brown);
    margin-bottom: 0.3em;
}

.welcome p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 540px;
    margin: 0 auto 0.6em;
}

.welcome-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.welcome-links a {
    display: inline-block;
    background-color: var(--brown);
    color: #fffdf9;
    text-decoration: none;
    padding: 0.45rem 1.2rem;
    border-radius: 20px;
    font-size: 0.88rem;
    letter-spacing: 0.02em;
    transition: background-color 0.2s ease, transform 0.15s ease;
}

.welcome-links a:hover {
    background-color: var(--green);
    color: #fffdf9;
    transform: translateY(-1px);
}

/* --- Random Picks --- */
.random-picks {
    margin-bottom: 2.5rem;
}

.random-picks h2 {
    text-align: center;
    margin-bottom: 0.8rem;
}

.picks-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    justify-content: center;
}

.pick-card {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem 1rem;
    min-width: 60px;
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    color: var(--blue);
    text-decoration: none;
    box-shadow: 0 1px 4px var(--shadow);
    transition: transform 0.15s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.pick-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 3px 10px var(--shadow);
    background-color: var(--highlight-green);
    color: var(--text);
}

/* --- Number List / Table --- */
.numbers-section {
    margin-bottom: 2rem;
}

.numbers-section h2 {
    margin-bottom: 0.8rem;
}

.number-list {
    list-style: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.2rem;
}

.number-list li {
    padding: 0.55rem 1rem;
    border-bottom: 1px solid var(--border);
    transition: background-color 0.15s ease;
}

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

.number-list li:nth-child(odd) {
    background-color: var(--card-bg);
}

.number-list li:nth-child(even) {
    background-color: var(--bg-alt);
}

.number-list li:hover {
    background-color: var(--highlight);
}

.number-list li a {
    display: block;
    text-decoration: none;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.number-list li a:hover {
    color: var(--brown);
    background: transparent;
}

/* --- Pagination --- */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.pagination a,
.pagination span {
    display: inline-block;
    padding: 0.4rem 1rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--brown);
    background: var(--card-bg);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.pagination a:hover {
    background-color: var(--brown);
    color: #fffdf9;
}

.pagination .page-info {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 0.4rem 0;
}

/* --- Number Card (single number page) --- */
.number-card {
    text-align: center;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 3px 12px var(--shadow);
    padding: 2.5rem 2rem;
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.number-card .number-display {
    font-size: 4rem;
    font-weight: 700;
    color: var(--brown);
    line-height: 1.1;
    margin-bottom: 0.3rem;
    letter-spacing: 0.02em;
}

.number-card .number-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
}

/* --- Number Navigation --- */
.number-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.number-nav a {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.88rem;
    text-decoration: none;
    color: var(--brown);
    background: var(--card-bg);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.number-nav a:hover {
    background-color: var(--brown);
    color: #fffdf9;
}

/* --- Puzzle / Captcha --- */
.puzzle-section {
    text-align: center;
    margin-top: 2rem;
    padding: 1.8rem;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 10px var(--shadow);
}

.puzzle-section form {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.puzzle-section h2 {
    color: var(--green);
    margin-bottom: 0.3em;
}

.puzzle-section p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

#puzzleBoard {
    display: inline-block;
    overflow: hidden;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px var(--shadow);
    background: #faf8f4;
    margin-bottom: 1rem;
    touch-action: none;
}

#puzzleBoard img.base-image {
    display: block;
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
}

#piece {
    position: absolute;
    cursor: grab;
    filter:
        drop-shadow(0px 0px 1px rgba(255, 255, 245, 0.9))
        drop-shadow(1px 0px 0px rgba(255, 255, 245, 0.8))
        drop-shadow(-1px 0px 0px rgba(255, 255, 245, 0.8))
        drop-shadow(0px 1px 0px rgba(255, 255, 245, 0.8))
        drop-shadow(0px -1px 0px rgba(255, 255, 245, 0.8))
        drop-shadow(2px 3px 4px rgba(60, 50, 35, 0.35));
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    z-index: 10;
}

#piece:active {
    cursor: grabbing;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    background-color: var(--brown);
    color: #fffdf9;
    border: none;
    padding: 0.55rem 1.6rem;
    border-radius: 22px;
    font-family: inherit;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.15s ease;
    text-decoration: none;
    margin-top: 0.8rem;
}

.btn:hover {
    background-color: var(--green);
    transform: translateY(-1px);
    color: #fffdf9;
}

.btn:active {
    transform: translateY(0);
}

/* --- Error Message --- */
.error-message {
    background-color: rgba(166, 115, 88, 0.12);
    border: 1px solid rgba(166, 115, 88, 0.3);
    color: var(--error);
    padding: 0.6rem 1rem;
    border-radius: var(--radius);
    font-size: 0.88rem;
    margin-bottom: 1rem;
    display: inline-block;
}

/* --- Successor Discovered Note --- */
.successor-note {
    text-align: center;
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--highlight-green);
    border-radius: var(--radius);
    font-size: 0.92rem;
    color: var(--text);
}

/* --- 404 Page --- */
.not-found {
    text-align: center;
    padding: 3rem 1rem;
}

.not-found .shelf-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.not-found h1 {
    color: var(--brown);
    font-size: 1.6rem;
    margin-bottom: 0.4em;
}

.not-found p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.not-found a {
    display: inline-block;
    padding: 0.45rem 1.3rem;
    background: var(--brown);
    color: #fffdf9;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.88rem;
    transition: background-color 0.2s ease;
}

.not-found a:hover {
    background-color: var(--green);
    color: #fffdf9;
}

/* --- Responsive --- */
@media (max-width: 600px) {
    html {
        font-size: 15px;
    }

    main {
        padding: 1.2rem 1rem 2rem;
    }

    .number-card {
        padding: 1.8rem 1.2rem;
    }

    .number-card .number-display {
        font-size: 3rem;
    }

    .welcome {
        padding: 1rem;
    }

    .picks-grid {
        gap: 0.5rem;
    }

    #puzzleBoard {
        max-width: 100%;
        overflow-x: auto;
    }
}

@media (max-width: 400px) {
    .welcome-links {
        flex-direction: column;
        align-items: center;
    }

    .pagination {
        gap: 0.5rem;
    }
}