/* ============================================
   SPACED SETS — Design System
   Monospace, dual-theme, muted, high-whitespace
   ============================================ */

/* --- Google Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&display=swap');

/* --- Theme Tokens --- */
:root {
    --bg: #f5f3f0;
    --bg-surface: #eae7e2;
    --fg: #2a2a2a;
    --fg-muted: #6b6b6b;
    --accent: #4a8b7f;
    --accent-hover: #3d7568;
    --accent-subtle: rgba(74, 139, 127, 0.12);
    --gain: #5a9a6b;
    --gain-bg: rgba(90, 154, 107, 0.1);
    --loss: #c47a5a;
    --loss-bg: rgba(196, 122, 90, 0.1);
    --border: #d5d0ca;
    --surface: #ffffff;
    --danger: #c45a5a;
    --danger-hover: #a84444;
    --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    --radius: 4px;
    --transition: 150ms ease;
}

[data-theme="dark"] {
    --bg: #141414;
    --bg-surface: #1e1e1e;
    --fg: #e8e6e3;
    --fg-muted: #8a8a8a;
    --accent: #6ab5a5;
    --accent-hover: #7ec5b5;
    --accent-subtle: rgba(106, 181, 165, 0.1);
    --gain: #7ab88a;
    --gain-bg: rgba(122, 184, 138, 0.1);
    --loss: #d49a7a;
    --loss-bg: rgba(212, 154, 122, 0.1);
    --border: #2e2e2e;
    --surface: #242424;
    --danger: #d46a6a;
    --danger-hover: #c45a5a;
}

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

html {
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-mono);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

/* --- Layout --- */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

main { padding: 2rem 0 4rem; }

/* --- Header / Nav --- */
.site-header {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 100;
    backdrop-filter: blur(8px);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--fg);
    letter-spacing: -0.02em;
}

.site-nav { display: flex; align-items: center; gap: 1.25rem; }
.site-nav a { color: var(--fg-muted); font-size: 0.85rem; }
.site-nav a:hover, .site-nav a.active { color: var(--accent); }

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--fg-muted);
    cursor: pointer;
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* --- Memory Score (hero) --- */
.memory-hero {
    text-align: center;
    padding: 2.5rem 0 2rem;
}

.memory-score {
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
    letter-spacing: -0.04em;
}

.memory-score .unit { font-size: 2rem; font-weight: 500; opacity: 0.7; }

.memory-label {
    color: var(--fg-muted);
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

.memory-empty {
    font-size: 2rem;
    font-weight: 700;
    color: var(--fg-muted);
    opacity: 0.5;
}

/* --- Gain / Loss --- */
.gain-loss {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.gain-item, .loss-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius);
}

.gain-item { color: var(--gain); background: var(--gain-bg); }
.loss-item { color: var(--loss); background: var(--loss-bg); }

.durability-line {
    text-align: center;
    color: var(--fg-muted);
    font-size: 0.78rem;
    margin-top: 0.75rem;
}

/* --- Sections --- */
.section {
    margin-top: 2.5rem;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--fg-muted);
}

/* --- Cards / Items --- */
.card-surface {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    transition: border-color var(--transition);
}

.card-surface:hover { border-color: var(--accent); }

.card-list { display: flex; flex-direction: column; gap: 0.5rem; }

.card-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}
.card-row:hover { border-color: var(--accent); }

.card-title {
    font-weight: 500;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

/* --- Source Tag --- */
.source-tag {
    display: inline-block;
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    background: var(--accent-subtle);
    color: var(--accent);
    border-radius: 2px;
    white-space: nowrap;
}

/* --- Retrievability Indicator --- */
.r-indicator {
    width: 36px;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    flex-shrink: 0;
}

.r-indicator-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--accent);
    transition: width 300ms ease;
}

.r-text {
    font-size: 0.7rem;
    color: var(--fg-muted);
    min-width: 2.5rem;
    text-align: right;
}

/* --- Source Summary Bars --- */
.source-summary { display: flex; flex-direction: column; gap: 0.75rem; }

.source-row {
    display: block;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}
.source-row:hover { border-color: var(--accent); }

.source-row-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.source-name { font-weight: 500; font-size: 0.9rem; }
.source-score { font-weight: 700; color: var(--accent); font-size: 0.9rem; }

.source-bar {
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.source-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 500ms ease;
}

.source-meta { font-size: 0.72rem; color: var(--fg-muted); margin-top: 0.4rem; }

/* --- Calendar Heatmap --- */
.calendar-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
}

.calendar-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.calendar-nav-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--fg-muted);
    cursor: pointer;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    transition: all var(--transition);
}
.calendar-nav-btn:hover { border-color: var(--accent); color: var(--accent); }

.calendar-month-label { font-weight: 500; font-size: 0.85rem; }

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 3px;
}

.calendar-day-header {
    font-size: 0.65rem;
    color: var(--fg-muted);
    text-align: center;
    padding: 0.25rem 0;
}

.calendar-day {
    aspect-ratio: 1;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    color: var(--fg-muted);
    position: relative;
    cursor: default;
}

.calendar-day.empty { background: transparent; }
.calendar-day.has-reviews { color: var(--fg); }
.calendar-day.today { outline: 1px solid var(--accent); outline-offset: -1px; }

.calendar-tooltip {
    display: none;
    position: absolute;
    bottom: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--fg);
    color: var(--bg);
    padding: 0.2rem 0.5rem;
    border-radius: 2px;
    font-size: 0.65rem;
    white-space: nowrap;
    z-index: 10;
}
.calendar-day:hover .calendar-tooltip { display: block; }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    background: var(--surface);
    color: var(--fg);
}

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

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }

.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; border-color: var(--danger); }

.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.72rem; }
.btn-block { width: 100%; }

/* --- Rating Buttons --- */
.rating-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.rating-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    background: var(--surface);
    color: var(--fg);
    transition: all var(--transition);
}

.rating-btn:hover { border-color: var(--accent); }
.rating-btn .interval { font-size: 0.65rem; color: var(--fg-muted); font-weight: 400; }

.rating-btn[data-rating="1"] { border-left: 3px solid var(--loss); }
.rating-btn[data-rating="2"] { border-left: 3px solid #c4a85a; }
.rating-btn[data-rating="3"] { border-left: 3px solid var(--accent); }
.rating-btn[data-rating="4"] { border-left: 3px solid var(--gain); }

.rating-btn[data-rating="1"]:hover { background: var(--loss-bg); }
.rating-btn[data-rating="3"]:hover { background: var(--accent-subtle); }
.rating-btn[data-rating="4"]:hover { background: var(--gain-bg); }

/* --- Forms --- */
.form-group { margin-bottom: 1.25rem; }

.form-group label {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--fg-muted);
    margin-bottom: 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.form-control {
    width: 100%;
    padding: 0.6rem 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
}

.form-control::placeholder { color: var(--fg-muted); opacity: 0.6; }

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b6b6b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.25rem;
    padding-right: 2rem;
}

textarea.form-control { resize: vertical; min-height: 80px; }

/* --- Flash Messages --- */
.flash { padding: 0.65rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.8rem; }
.flash-success { background: var(--gain-bg); color: var(--gain); border: 1px solid var(--gain); }
.flash-error { background: var(--loss-bg); color: var(--loss); border: 1px solid var(--loss); }
.flash-info { background: var(--accent-subtle); color: var(--accent); border: 1px solid var(--accent); }

/* --- Review Card --- */
.review-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.review-progress {
    font-size: 0.72rem;
    color: var(--fg-muted);
    text-align: center;
    margin-bottom: 1.5rem;
}

.review-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.review-url {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    word-break: break-all;
}

.review-notes {
    font-size: 0.82rem;
    color: var(--fg-muted);
    padding: 0.75rem;
    background: var(--bg);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
    white-space: pre-wrap;
}

.review-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

/* --- Summary --- */
.summary-hero {
    text-align: center;
    padding: 3rem 0 2rem;
}

.summary-score-change {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 1rem;
}

.summary-arrow { color: var(--fg-muted); font-size: 1.2rem; }
.summary-stat { text-align: center; padding: 1rem; }
.summary-stat-value { font-size: 1.8rem; font-weight: 700; color: var(--accent); }
.summary-stat-label { font-size: 0.75rem; color: var(--fg-muted); margin-top: 0.25rem; }

/* --- Empty States --- */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--fg-muted);
}

.empty-state-icon { font-size: 2rem; margin-bottom: 0.75rem; opacity: 0.5; }
.empty-state-text { font-size: 0.9rem; margin-bottom: 1rem; }

/* --- Inline Source Form --- */
.inline-source-form {
    display: flex;
    gap: 0.5rem;
    align-items: end;
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--bg);
    border-radius: var(--radius);
}

.inline-source-form .form-control { flex: 1; }

/* --- Auth Page --- */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
}

.auth-card {
    width: 100%;
    max-width: 360px;
    padding: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.auth-title {
    font-size: 1.3rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.25rem;
}

.auth-subtitle {
    font-size: 0.78rem;
    color: var(--fg-muted);
    text-align: center;
    margin-bottom: 1.5rem;
}

/* --- Utility --- */
.text-muted { color: var(--fg-muted); }
.text-accent { color: var(--accent); }
.text-gain { color: var(--gain); }
.text-loss { color: var(--loss); }
.text-center { text-align: center; }
.text-sm { font-size: 0.78rem; }
.text-xs { font-size: 0.7rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-sm { gap: 0.5rem; }

/* --- htmx transitions --- */
.htmx-swapping { opacity: 0; transition: opacity 100ms ease; }
.htmx-settling { opacity: 1; transition: opacity 200ms ease; }

/* --- Responsive --- */
@media (max-width: 640px) {
    .memory-score { font-size: 3rem; }
    .gain-loss { flex-direction: column; align-items: center; gap: 0.5rem; }
    .rating-buttons { grid-template-columns: repeat(2, 1fr); }
    .card-row { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
    .card-meta { width: 100%; justify-content: space-between; }
    .source-row-header { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
    .review-card { padding: 1.25rem; }
    .site-nav { gap: 0.75rem; }
    .site-nav a { font-size: 0.75rem; }
}