/* ==========================================================================
   Palestra — dark, mobile-first CSS
   ========================================================================== */

:root {
    --bg: #0f172a;
    --bg-elev: #1e293b;
    --bg-elev-2: #243049;
    --border: #334155;
    --border-strong: #475569;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

body {
    display: flex;
    flex-direction: column;
}

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

h1, h2, h3, h4 {
    margin: 0 0 0.5rem;
    line-height: 1.25;
    font-weight: 600;
}
h1 { font-size: 1.6rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }

p { margin: 0 0 1rem; }
.small { font-size: 0.85rem; }

.text-muted { color: var(--text-muted); }

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: 880px;
    margin: 0 auto;
    padding: 0 1rem;
}

.app-header {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}
.app-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}
.app-header__brand {
    color: var(--text);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.02em;
    text-decoration: none;
}
.app-header__brand:hover { text-decoration: none; opacity: 0.85; }

.app-main {
    flex: 1;
    padding: 1.25rem 1rem 2rem;
}

.app-footer {
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    text-align: center;
    padding: 1rem 0;
    font-size: 0.8rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1.1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
    min-height: 42px;
    user-select: none;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn--primary { background: var(--accent); color: white; }
.btn--primary:hover { background: var(--accent-hover); }

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

.btn--danger { background: var(--danger); color: white; }
.btn--danger:hover { background: var(--danger-hover); }

.btn--block { width: 100%; }
.btn--sm { padding: 0.45rem 0.8rem; font-size: 0.85rem; min-height: 34px; }
.btn--xs { padding: 0.3rem 0.55rem; font-size: 0.78rem; min-height: 28px; }

.btn + .btn { margin-top: 0.6rem; }
.form-actions .btn + .btn { margin-top: 0; }

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: var(--text);
    background: transparent;
    border: 1px solid var(--border);
    text-decoration: none;
}
.icon-btn:hover { background: var(--bg-elev); }

/* ===== Messages / alerts ===== */
.messages {
    padding-top: 0.75rem;
}
.message {
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    border: 1px solid;
}
.message--success { background: rgba(16,185,129,0.12); border-color: rgba(16,185,129,0.4); color: #6ee7b7; }
.message--info    { background: rgba(59,130,246,0.12); border-color: rgba(59,130,246,0.4); color: #93c5fd; }
.message--warning { background: rgba(245,158,11,0.12); border-color: rgba(245,158,11,0.4); color: #fcd34d; }
.message--error,
.message--danger  { background: rgba(239,68,68,0.12); border-color: rgba(239,68,68,0.45); color: #fca5a5; }

/* ===== Forms ===== */
.form-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem;
    box-shadow: var(--shadow);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 0.9rem;
}
.field__label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}
.field__help { color: var(--text-dim); font-size: 0.78rem; }
.field__error { color: #fca5a5; font-size: 0.82rem; }

.field input,
.field select,
.field textarea,
input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="datetime-local"],
input[type="date"],
select,
textarea {
    width: 100%;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.65rem 0.8rem;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.25);
}
textarea { resize: vertical; min-height: 60px; }

.field--inline {
    flex-direction: column;
}

.field--checkbox {
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
}
.field--checkbox input { width: auto; }

.form-actions {
    display: flex;
    gap: 0.6rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}
.form-actions .btn { flex: 1 1 0; min-width: 120px; }

/* ===== Number input with +/− ===== */
.numinput {
    display: flex;
    align-items: stretch;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.numinput input {
    border: none;
    border-radius: 0;
    text-align: center;
    flex: 1;
    min-width: 0;
    background: transparent;
    font-size: 1.05rem;
    font-weight: 600;
    padding: 0.55rem 0.4rem;
}
.numinput input:focus { box-shadow: none; }
.numinput__btn {
    background: var(--bg-elev);
    color: var(--text);
    border: none;
    width: 44px;
    font-size: 1.3rem;
    font-weight: 600;
    cursor: pointer;
    line-height: 1;
    user-select: none;
    transition: background 0.15s ease;
}
.numinput__btn:hover { background: var(--bg-elev-2); }
.numinput__btn:active { background: var(--accent); color: white; }

/* Hide native spin buttons on number inputs inside numinput */
.numinput input::-webkit-outer-spin-button,
.numinput input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.numinput input[type=number] { -moz-appearance: textfield; }

/* ===== Auth pages ===== */
.auth-card {
    max-width: 420px;
    margin: 2rem auto;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
}
.auth-card h1 { margin-bottom: 0.35rem; }
.auth-card__alt {
    margin-top: 1.2rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== Cards / lists ===== */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.1rem;
    flex-wrap: wrap;
}
.page-header__actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.page-actions { margin: 0.6rem 0 1.2rem; }

.breadcrumb { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 0.5rem; }
.breadcrumb a { color: var(--text-muted); }

.card-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.7rem;
}

.card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem 1rem;
    transition: border-color 0.15s ease, transform 0.05s ease;
}
.card:hover { border-color: var(--border-strong); }
.card__main {
    display: block;
    color: var(--text);
    text-decoration: none;
}
.card__main:hover { text-decoration: none; }
.card__title {
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 0.2rem;
}
.card__sub {
    color: var(--text-muted);
    font-size: 0.88rem;
}
.card__actions {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.7rem;
    flex-wrap: wrap;
}

/* ===== Stack of settings links ===== */
.stack {
    display: grid;
    gap: 0.6rem;
}
.card-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem 1.1rem;
    color: var(--text);
    text-decoration: none;
    transition: border-color 0.15s ease;
}
.card-link:hover { border-color: var(--border-strong); text-decoration: none; }
.card-link__title { font-weight: 600; }
.card-link__sub { color: var(--text-muted); font-size: 0.85rem; }
.card-link--danger { border-color: rgba(239,68,68,0.4); }
.card-link--danger:hover { border-color: var(--danger); }

.card-link--button { padding: 0; }
.card-link__btn {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text);
    text-align: left;
    padding: 0.9rem 1.1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    cursor: pointer;
    font: inherit;
}

/* ===== Empty states ===== */
.empty-state {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--bg-elev);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius);
}
.empty-state h2 { margin-bottom: 0.4rem; }
.empty-state--small { padding: 1rem; }

/* ===== Exercise dashboard ===== */
.card-section {
    margin: 1.5rem 0;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem;
}
.card-section h2 { margin-bottom: 0.6rem; }
.card-section__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 0.6rem;
}

.perf-form__grid { display: grid; gap: 0.8rem; }
.perf-form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.7rem;
}

.stats-grid {
    display: grid;
    gap: 0.8rem;
    grid-template-columns: 1fr;
    margin: 1.5rem 0;
}
.stat-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
}
.stat-card h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.6rem;
}
.stat-card--accent { border-color: rgba(59,130,246,0.45); }
.stat-card__big {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}
.stat-card__sub {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}
.stat-card__row {
    display: flex;
    justify-content: space-between;
    padding: 0.25rem 0;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
}
.stat-card__row:first-of-type { border-top: none; }

/* ===== Range tabs ===== */
.range-tabs {
    display: inline-flex;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 2px;
    overflow-x: auto;
}
.range-tab {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 500;
    white-space: nowrap;
    transition: background 0.15s ease, color 0.15s ease;
}
.range-tab:hover { color: var(--text); }
.range-tab.is-active {
    background: var(--accent);
    color: white;
}

/* ===== Charts ===== */
.chart-wrap {
    display: grid;
    gap: 0.8rem;
    grid-template-columns: 1fr;
}
.chart-box {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.7rem;
}

/* ===== Tables ===== */
.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    min-width: 600px;
}
.data-table th,
.data-table td {
    padding: 0.55rem 0.7rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.data-table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.data-table tbody tr:hover { background: rgba(255,255,255,0.02); }
.cell-notes {
    max-width: 220px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.cell-actions {
    white-space: nowrap;
    display: flex;
    gap: 0.3rem;
}

/* ===== Responsive ===== */
@media (min-width: 640px) {
    .stats-grid { grid-template-columns: repeat(3, 1fr); }
    .chart-wrap { grid-template-columns: 1fr 1fr; }
    h1 { font-size: 1.85rem; }
}

@media (max-width: 480px) {
    .perf-form__row { grid-template-columns: 1fr 1fr; }
    .page-header__actions .btn { flex: 1; min-width: 0; }
    .card__actions .btn { flex: 1; min-width: 0; }
}