/* ============================================================
   Period Tracker — Theme 12: Bootstrap neutral + navy text
   Light gray surfaces, near-black headings, colored left-border
   accents instead of filled badges. Built mobile-first.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --color-bg: #F8F9FA;
    --color-bg-elevated: #FFFFFF;
    --color-surface: #E9ECEF;
    --color-surface-hover: #DEE2E6;
    --color-navy: #212529;
    --color-navy-soft: #495057;
    --color-primary: #0D6EFD;
    --color-primary-soft: #CFE2FF;
    --color-primary-deep: #0A58CA;
    --color-pink: #D63384;
    --color-pink-soft: #F7D6E6;
    --color-pink-deep: #99195C;
    --color-cyan: #0DCAF0;
    --color-cyan-soft: #CFF4FC;
    --color-cyan-deep: #087990;
    --color-amber: #FFC107;
    --color-amber-soft: #FFF3CD;
    --color-amber-deep: #997404;
    --color-green: #198754;
    --color-green-soft: #D1E7DD;
    --color-red: #DC3545;

    --color-text: var(--color-navy);
    --color-text-muted: var(--color-navy-soft);
    --color-border: #DEE2E6;
    --color-period: var(--color-pink);
    --color-fertile: var(--color-cyan);
    --color-ovulation: var(--color-amber);
    --color-predicted: var(--color-primary);

    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 999px;
    --shadow-soft: 0 1px 3px rgba(33, 37, 41, 0.08);
    --shadow-lifted: 0 8px 24px rgba(33, 37, 41, 0.16);
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;
    --space-6: 48px;
    --tap-min: 44px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

img, svg, canvas { max-width: 100%; }

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--color-navy);
    margin: 0 0 var(--space-2) 0;
    letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.1rem); }
h2 { font-size: clamp(1.15rem, 1.05rem + 0.4vw, 1.4rem); }
h3 { font-size: 1.05rem; font-weight: 600; }

p { margin: 0 0 var(--space-2) 0; color: var(--color-text); }
.text-muted { color: var(--color-text-muted); }

a { color: var(--color-primary-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell {
    max-width: 1180px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-3) var(--space-6);
    width: 100%;
}

@media (min-width: 640px) {
    .app-shell { padding: var(--space-5) var(--space-4) var(--space-6); }
}

.app-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
    gap: var(--space-3);
}

@media (min-width: 640px) {
    .app-header { align-items: baseline; margin-bottom: var(--space-5); }
}

.app-header .eyebrow {
    font-family: var(--font-body);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-primary-deep);
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.user-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.user-chip strong { color: var(--color-navy); font-weight: 600; }

.nav-tabs {
    display: flex;
    gap: var(--space-1);
    background: var(--color-bg-elevated);
    padding: var(--space-1);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--color-border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    max-width: 100%;
}
.nav-tabs::-webkit-scrollbar { display: none; }

.nav-tab {
    padding: 10px var(--space-3);
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    cursor: pointer;
    border: none;
    background: transparent;
    white-space: nowrap;
    flex-shrink: 0;
    min-height: var(--tap-min);
    transition: background 0.2s ease, color 0.2s ease;
}

.nav-tab.active { background: var(--color-primary); color: #fff; }
.nav-tab:not(.active):hover { background: var(--color-surface); color: var(--color-navy); }

.card {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--color-border);
    min-width: 0;
}

@media (min-width: 640px) {
    .card { padding: var(--space-4); }
}

.grid { display: grid; gap: var(--space-3); min-width: 0; }

@media (min-width: 640px) {
    .grid { gap: var(--space-4); }
}

.grid-hero { grid-template-columns: 1fr; }

@media (min-width: 860px) {
    .grid-hero { grid-template-columns: minmax(260px, 360px) 1fr; }
}

.grid-2col { grid-template-columns: 1fr; }
.grid-3col { grid-template-columns: 1fr; }

@media (min-width: 640px) {
    .grid-2col { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 760px) {
    .grid-3col { grid-template-columns: repeat(3, minmax(0,1fr)); }
}

.cycle-wheel-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.cycle-wheel-wrap svg {
    width: min(220px, 70vw);
    height: min(220px, 70vw);
}

@media (min-width: 640px) {
    .cycle-wheel-wrap svg { width: 220px; height: 220px; }
}

.cycle-wheel-day {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    fill: var(--color-navy);
}

.cycle-wheel-phase {
    font-family: var(--font-body);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    fill: var(--color-text-muted);
    font-weight: 600;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 10px var(--space-3);
    min-height: var(--tap-min);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s ease;
}

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

.btn-secondary { background: var(--color-primary-soft); color: var(--color-primary-deep); }
.btn-secondary:hover { background: #BBD6FE; }

.btn-ghost { background: transparent; color: var(--color-text-muted); border-color: var(--color-border); }
.btn-ghost:hover { background: var(--color-surface); }

.btn:focus-visible { outline: 3px solid var(--color-amber); outline-offset: 2px; }
.btn:active { transform: scale(0.98); }

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
}

input[type="date"],
input[type="number"],
input[type="text"],
input[type="password"],
textarea,
select {
    width: 100%;
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 10px 14px;
    min-height: var(--tap-min);
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
    background: var(--color-bg-elevated);
    color: var(--color-text);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.chip-group { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.chip {
    padding: 9px 16px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    border-radius: var(--radius-full);
    border: 1.5px solid var(--color-border);
    background: var(--color-bg-elevated);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: all 0.15s ease;
    -webkit-tap-highlight-color: transparent;
}

.chip.selected { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.chip.mood.selected { background: var(--color-amber); border-color: var(--color-amber); color: #5C4400; }

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 4px;
}

@media (min-width: 480px) {
    .calendar-grid { gap: 6px; }
}

.calendar-weekday {
    text-align: center;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding-bottom: var(--space-1);
}

@media (min-width: 480px) {
    .calendar-weekday { font-size: 0.7rem; }
}

.calendar-day {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    position: relative;
    background: var(--color-bg);
    color: var(--color-text);
    border: 1.5px solid transparent;
    min-height: 28px;
}

@media (min-width: 480px) {
    .calendar-day { font-size: 0.85rem; }
}

.calendar-day.empty { visibility: hidden; cursor: default; }

.calendar-day.period { background: var(--color-pink); color: #fff; }
.calendar-day.fertile { background: var(--color-cyan-soft); color: var(--color-cyan-deep); }
.calendar-day.ovulation { background: var(--color-amber); color: #5C4400; }
.calendar-day.predicted { border: 2px dashed var(--color-primary); background: var(--color-bg); }
.calendar-day.today { box-shadow: 0 0 0 2px var(--color-navy); }

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-3);
    font-size: 0.78rem;
    color: var(--color-text-muted);
}

.legend-item { display: flex; align-items: center; gap: 6px; }
.legend-dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; flex-shrink: 0; }

.cal-nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.cal-nav-row h2 { margin: 0; font-size: 1.05rem; text-align: center; flex: 1; }

@media (min-width: 480px) {
    .cal-nav-row h2 { font-size: 1.25rem; }
}

.stat-block {
    text-align: center;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--color-surface);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primary-deep);
    line-height: 1;
}

@media (min-width: 480px) {
    .stat-value { font-size: 1.9rem; }
}

.stat-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.stat-block.accent-period { border-left: 3px solid var(--color-pink); }
.stat-block.accent-fertile { border-left: 3px solid var(--color-cyan-deep); }

.section-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
    flex-wrap: wrap;
    gap: var(--space-2);
}

.divider { height: 1px; background: var(--color-border); margin: var(--space-4) 0; border: none; }

.empty-state { text-align: center; padding: var(--space-5) var(--space-3); color: var(--color-text-muted); }

.toast {
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-navy);
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    box-shadow: var(--shadow-lifted);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    max-width: 90vw;
    text-align: center;
}

.toast.visible { opacity: 1; transform: translateX(-50%) translateY(-8px); }

.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3);
}

.auth-wrap { width: 100%; max-width: 380px; }

.auth-card {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
    padding: var(--space-5) var(--space-4);
}

.auth-brand { text-align: center; margin-bottom: var(--space-4); }

.auth-brand-mark {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primary-deep);
}

.alert-error {
    background: #F8D7DA;
    color: #842029;
    border: 1px solid #F1AEB5;
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 0.85rem;
    margin-bottom: var(--space-3);
}

.heatmap-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.heatmap-scroll table { border-collapse: collapse; font-size: 0.72rem; min-width: 560px; }

/* ---------- Cycle gallery ---------- */
.gallery-header-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.gallery-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    background: var(--color-surface);
    color: var(--color-text-muted);
}

.gallery-badge-current {
    background: var(--color-primary-soft);
    color: var(--color-primary-deep);
}

.gallery-wheel-wrap {
    display: flex;
    justify-content: center;
    margin: var(--space-3) auto;
    width: 100%;
}

.gallery-wheel-wrap svg {
    width: min(480px, 92vw);
    height: min(480px, 92vw);
}

@media (min-width: 640px) {
    .gallery-wheel-wrap svg { width: 480px; height: 480px; }
}

.gallery-nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-top: var(--space-4);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.gallery-nav-row span {
    font-size: 0.85rem;
    font-weight: 600;
}

.gallery-nav-row .btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ---------- Year view ---------- */
.yv-hero {
    background: linear-gradient(135deg, var(--color-primary), #4338CA);
    color: #fff;
    border: none;
    margin-bottom: var(--space-3);
}

.yv-hero-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.yv-hero-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.8;
    margin-bottom: 4px;
}

.yv-hero-title {
    color: #fff;
    margin-bottom: 4px;
}

.yv-year-nav {
    display: flex;
    gap: var(--space-2);
}

.yv-year-nav .btn-ghost {
    background: rgba(255,255,255,0.14);
    border-color: rgba(255,255,255,0.3);
    color: #fff;
}
.yv-year-nav .btn-ghost:hover { background: rgba(255,255,255,0.24); }

.yv-kpi-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: var(--space-3);
}

@media (min-width: 640px) {
    .yv-kpi-row { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
}
@media (min-width: 960px) {
    .yv-kpi-row { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

.yv-kpi {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    position: relative;
    overflow: hidden;
    min-height: 78px;
}

.yv-kpi::before {
    content: '';
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: var(--yv-color, var(--color-primary));
}

.yv-kpi-label {
    font-size: 0.62rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.yv-kpi-value {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1;
    color: var(--yv-color, var(--color-primary));
    white-space: nowrap;
}

.yv-kpi-sub {
    font-size: 0.66rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.yv-months-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3);
}

@media (min-width: 640px) {
    .yv-months-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1100px) {
    .yv-months-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.yv-month-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-width: 0;
}

.yv-month-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 12px 14px 10px;
    border-bottom: 1px solid var(--color-border);
}

.yv-month-name {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--color-navy);
}

.yv-month-count {
    font-size: 0.68rem;
    color: var(--color-text-muted);
}

.yv-weekdays, .yv-days-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
}

.yv-wd {
    text-align: center;
    font-size: 0.55rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-text-muted);
    padding: 8px 0 4px;
}

.yv-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-width: 0;
}

.yv-day.blank { visibility: hidden; }

.yv-day-inner {
    width: 78%;
    height: 78%;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--color-text);
    background: transparent;
    cursor: pointer;
}

.yv-day.today .yv-day-inner {
    box-shadow: inset 0 0 0 2px var(--color-navy);
    font-weight: 800;
}

.yv-day-inner.phase-menstrual { background: var(--color-pink); color: #fff; }
.yv-day-inner.phase-follicular { background: var(--color-cyan-soft); color: var(--color-cyan-deep); }
.yv-day-inner.phase-possible { background: #DCEEC0; color: #44621B; }
.yv-day-inner.phase-ovulation { background: var(--color-amber); color: #5C4400; }
.yv-day-inner.phase-luteal { background: var(--color-primary-soft); color: var(--color-primary-deep); }

.yv-month-foot {
    display: flex;
    gap: var(--space-2);
    padding: 10px 14px 14px;
    flex-wrap: wrap;
}

.yv-legend-mini {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0 14px 14px;
    font-size: 0.66rem;
    color: var(--color-text-muted);
}

.yv-legend-mini .legend-dot { width: 8px; height: 8px; }

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}