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

:root {
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a25;
    --bg-input: #16161f;
    --text: #e8e6e3;
    --text-dim: rgba(255,255,255,0.45);
    --text-dimmer: rgba(255,255,255,0.25);
    --accent: #2A9D8F;
    --danger: #E63946;
    --warning: #E9C46A;
    --success: #2A9D8F;
    --radius: 12px;
    --radius-sm: 8px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { opacity: 0.85; }

/* === Layout === */
.main-content {
    padding-bottom: 80px; /* space for bottom nav */
    max-width: 540px;
    margin: 0 auto;
}

.page-container { padding: 20px 16px; }

/* === Navigation === */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    padding-bottom: max(10px, env(safe-area-inset-bottom));
    background: linear-gradient(to top, var(--bg) 60%, transparent);
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 20px;
    border-radius: 12px;
    color: var(--text-dim);
    font-size: 10px;
    letter-spacing: 0.5px;
    transition: all 0.2s;
}

.nav-item.active {
    background: rgba(255,255,255,0.06);
    color: var(--text);
}

.nav-item:hover { color: var(--text); }

/* === Page Header === */
.page-label {
    font-size: 11px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-dimmer);
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    margin-top: 4px;
    letter-spacing: -0.5px;
}

.page-header { margin-bottom: 24px; }

/* === Auth Pages === */
.auth-container {
    max-width: 380px;
    margin: 0 auto;
    padding: 60px 20px 40px;
}

.auth-header { text-align: center; margin-bottom: 36px; }
.auth-header h1 { font-size: 28px; font-weight: 700; margin-top: 12px; }
.auth-subtitle { color: var(--text-dim); font-size: 14px; margin-top: 6px; }
.logo-icon { font-size: 48px; }

.auth-form { display: flex; flex-direction: column; gap: 18px; }
.auth-footer { text-align: center; margin-top: 24px; color: var(--text-dim); font-size: 14px; }

/* === Forms === */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 500; color: var(--text-dim); }

.form-input {
    background: var(--bg-input);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    color: var(--text);
    font-size: 15px;
    font-family: var(--font);
    outline: none;
    transition: border-color 0.2s;
    width: 100%;
}

.form-input:focus { border-color: var(--accent); }
.form-input::placeholder { color: var(--text-dimmer); }

.form-hint { font-size: 11px; color: var(--text-dimmer); }

.form-error {
    background: rgba(230,57,70,0.1);
    border: 1px solid rgba(230,57,70,0.2);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 13px;
    color: #ff6b6b;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-full { width: 100%; }
.btn-sm { padding: 8px 16px; font-size: 13px; background: var(--bg-card); color: var(--text); border: 1px solid rgba(255,255,255,0.1); }
.btn-sm:hover { background: var(--bg-card-hover); }

/* === Today Card === */
.today-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 28px;
}

.today-date { display: flex; flex-direction: column; margin-bottom: 14px; }
.today-weekday { font-size: 18px; font-weight: 600; }
.today-full { font-size: 13px; color: var(--text-dim); margin-top: 2px; }

.btn-start {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px;
    border-radius: var(--radius-sm);
    width: 100%;
}
.btn-start-label { font-size: 14px; }
.btn-start-plan { font-size: 12px; font-weight: 500; }

.today-rest {
    text-align: center;
    padding: 16px;
    color: var(--text-dim);
    font-size: 14px;
}

/* === Calendar === */
.calendar-section { margin-bottom: 28px; }

.calendar-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.cal-month { font-size: 16px; font-weight: 600; }
.cal-arrow {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text);
    font-size: 16px;
}

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

.cal-head {
    text-align: center;
    font-size: 10px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-dimmer);
    padding: 6px 0;
}

.cal-weekend { opacity: 0.5; }

.cal-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-dim);
    position: relative;
}

.cal-empty { visibility: hidden; }
.cal-today { background: rgba(255,255,255,0.06); color: var(--text); font-weight: 700; }
.cal-done .cal-day-num { color: var(--accent); font-weight: 600; }

.cal-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    position: absolute;
    bottom: 4px;
}

/* === Plans List === */
.plans-section { margin-bottom: 28px; }
.section-title { font-size: 18px; font-weight: 600; margin-bottom: 4px; }
.section-hint { font-size: 12px; color: var(--text-dimmer); margin-bottom: 14px; }

.plan-list { display: flex; flex-direction: column; gap: 8px; }

.plan-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: var(--bg-card);
    border-radius: var(--radius);
    color: var(--text);
    transition: background 0.2s;
}
.plan-card:hover { background: var(--bg-card-hover); }

.plan-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.plan-dot-lg {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
}

.plan-info { flex: 1; display: flex; flex-direction: column; }
.plan-name { font-size: 14px; font-weight: 600; }
.plan-day { font-size: 12px; color: var(--text-dim); margin-top: 2px; }
.plan-arrow { color: var(--text-dimmer); flex-shrink: 0; }

/* === Workout Page === */
.workout-header { margin-bottom: 20px; }

.back-link {
    font-size: 13px;
    color: var(--text-dim);
    display: inline-block;
    margin-bottom: 12px;
}

.workout-title-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.workout-title { font-size: 22px; font-weight: 700; }
.workout-date { font-size: 13px; color: var(--text-dim); }
.workout-tag { font-size: 11px; color: var(--text-dimmer); display: block; margin-top: 2px; }

/* Warmup */
.warmup-card {
    display: flex;
    gap: 12px;
    padding: 14px 16px;
    background: rgba(233,196,74,0.06);
    border: 1px solid rgba(233,196,74,0.12);
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.warmup-icon { font-size: 22px; flex-shrink: 0; }
.warmup-text { display: flex; flex-direction: column; gap: 3px; }
.warmup-text strong { font-size: 14px; }
.warmup-text span { font-size: 12px; color: var(--text-dim); line-height: 1.5; }

/* Exercise cards */
.exercise-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }

.exercise-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.2s;
}

.exercise-card.open { background: var(--bg-card-hover); }
.exercise-card.completed { opacity: 0.7; }
.exercise-card.completed .exercise-name { text-decoration: line-through; opacity: 0.6; }

.exercise-category {
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-dimmer);
    padding: 12px 16px 6px;
    border-top: 1px solid rgba(255,255,255,0.04);
}

.exercise-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.exercise-num {
    font-size: 11px;
    font-weight: 700;
    font-family: var(--font-mono);
    min-width: 22px;
}

.exercise-info { flex: 1; display: flex; flex-direction: column; }
.exercise-name { font-size: 14px; font-weight: 500; }
.exercise-target { font-size: 11px; color: var(--text-dimmer); margin-top: 2px; }

.exercise-status { flex-shrink: 0; }
.sets-label { font-size: 11px; color: var(--text-dimmer); font-family: var(--font-mono); }
.status-done { color: var(--success); font-size: 16px; }
.status-partial { font-size: 11px; color: var(--warning); font-family: var(--font-mono); }

/* Overload hint */
.overload-hint {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    margin: 0 16px;
    background: rgba(42,157,143,0.08);
    border: 1px solid rgba(42,157,143,0.15);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--accent);
}

/* Exercise body (expandable) */
.exercise-body { padding: 0 16px 16px; }

.exercise-tip {
    font-size: 12px;
    color: var(--text-dim);
    line-height: 1.6;
    padding: 10px 14px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

/* Set rows */
.set-row {
    padding: 12px 0;
    border-top: 1px solid rgba(255,255,255,0.04);
}

.set-label {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.set-target {
    font-size: 11px;
    color: var(--text-dimmer);
    font-weight: 400;
}

.set-inputs {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.set-inputs .input-group { flex: 1; }
.set-inputs .input-group label { display: block; font-size: 10px; color: var(--text-dimmer); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 1px; }

.weight-input, .reps-input {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    padding: 10px 8px;
}

/* Difficulty buttons */
.difficulty-group { flex: 1.3; }

.difficulty-btns {
    display: flex;
    gap: 4px;
}

.diff-btn {
    flex: 1;
    padding: 9px 4px;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 6px;
    background: transparent;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.15s;
    opacity: 0.35;
}

.diff-btn.active { opacity: 1; }
.diff-btn.active.diff-easy { background: rgba(42,157,143,0.15); border-color: rgba(42,157,143,0.3); }
.diff-btn.active.diff-medium { background: rgba(233,196,74,0.15); border-color: rgba(233,196,74,0.3); }
.diff-btn.active.diff-hard { background: rgba(230,57,70,0.15); border-color: rgba(230,57,70,0.3); }

/* Previous reference */
.prev-ref {
    display: none;
    font-size: 11px;
    color: var(--text-dimmer);
    margin-top: 6px;
    font-family: var(--font-mono);
}

/* Save button */
.btn-save-sets {
    width: 100%;
    margin-top: 14px;
    font-weight: 600;
}
.btn-save-sets:hover { opacity: 0.85; }

/* Complete button */
.complete-section { padding: 0 0 20px; }

.btn-complete {
    font-size: 16px;
    padding: 16px;
    letter-spacing: 0.5px;
}

/* === Dashboard === */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px 12px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 10px;
    color: var(--text-dimmer);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.dash-section {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px 16px;
    margin-bottom: 16px;
}

.weight-log-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.weight-current { display: flex; flex-direction: column; }
.weight-big { font-size: 28px; font-weight: 700; font-family: var(--font-mono); }
.weight-date { font-size: 11px; color: var(--text-dimmer); }
.weight-target { font-size: 11px; color: var(--warning); margin-top: 2px; }

.weight-input-row { display: flex; gap: 6px; align-items: center; }
.weight-input-row .form-input { width: 100px; text-align: center; font-family: var(--font-mono); }

.chart-container {
    position: relative;
    width: 100%;
}

.chart-container canvas { width: 100% !important; }

.input-row { display: flex; gap: 12px; margin-bottom: 12px; }
.input-row .input-group { flex: 1; }
.input-row .input-group label { display: block; font-size: 11px; color: var(--text-dim); margin-bottom: 4px; }

.profile-form .btn-sm { margin-top: 4px; }

.exercise-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: var(--text-dim);
}

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* === Toast === */
.toast {
    position: fixed;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 10px 20px;
    border-radius: 24px;
    font-size: 13px;
    font-weight: 500;
    z-index: 200;
    opacity: 0;
    transition: all 0.3s;
    white-space: nowrap;
    pointer-events: none;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast-success { background: rgba(42,157,143,0.9); color: #fff; }
.toast-error { background: rgba(230,57,70,0.9); color: #fff; }
.toast-warning { background: rgba(233,196,74,0.9); color: #000; }

/* === Exercise Progress Page === */
.ex-picker-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
}

.ex-picker-label {
    display: block;
    font-size: 11px;
    color: var(--text-dimmer);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.ex-select { font-size: 14px; cursor: pointer; }

.range-pills {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.range-pills::-webkit-scrollbar { display: none; }

.range-pill {
    flex-shrink: 0;
    padding: 7px 18px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
    background: var(--bg-card);
    color: var(--text-dim);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.range-pill.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.ex-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 12px;
    margin-bottom: 4px;
}

.ex-stat {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 10px 8px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
    text-align: center;
}

.ex-stat-val {
    font-size: 18px;
    font-weight: 700;
    font-family: var(--font-mono);
}

.ex-stat-lbl {
    font-size: 9px;
    color: var(--text-dimmer);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-toggle {
    display: flex;
    gap: 8px;
    margin-top: 14px;
}

.metric-btn {
    flex: 1;
    padding: 8px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255,255,255,0.08);
    background: transparent;
    color: var(--text-dim);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.metric-btn.active {
    background: rgba(42,157,143,0.15);
    border-color: rgba(42,157,143,0.3);
    color: var(--accent);
}

.diff-legend {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 14px;
    font-size: 11px;
    color: var(--text-dimmer);
}

.diff-legend-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.ex-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 60px 20px;
    color: var(--text-dimmer);
    font-size: 14px;
    text-align: center;
}

.ex-tooltip {
    position: absolute;
    background: rgba(18,18,26,0.96);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 12px;
    line-height: 1.6;
    pointer-events: none;
    display: none;
    z-index: 300;
    white-space: nowrap;
}

/* === Responsive === */
@media (max-width: 360px) {
    .set-inputs { flex-wrap: wrap; }
    .difficulty-group { flex-basis: 100%; }
    .stats-row { grid-template-columns: repeat(3, 1fr); gap: 6px; }
    .stat-value { font-size: 20px; }
}

/* Hide number input spinners on mobile for cleaner UI */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type=number] { -moz-appearance: textfield; }

/* === Demo info button === */
.demo-btn {
    background: none;
    border: 1.5px solid rgba(255,255,255,0.25);
    color: rgba(255,255,255,0.6);
    border-radius: 50%;
    width: 26px;
    height: 26px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    margin-right: 8px;
    font-style: normal;
}
.demo-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(42,157,143,0.1);
}

/* === Demo modal === */
.demo-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
}
.demo-modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}
.demo-modal {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.08);
    width: 100%;
    max-width: 420px;
    padding: 20px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.25s;
}
.demo-modal-overlay.active .demo-modal {
    transform: translateY(0);
}
.demo-modal-close {
    position: absolute;
    top: 12px;
    right: 14px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 22px;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
}
.demo-modal-close:hover { color: var(--text); }
.demo-modal-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 14px;
    padding-right: 30px;
}
.demo-modal-media {
    width: 100%;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.demo-modal-media img {
    width: 100%;
    height: auto;
    display: block;
    max-height: 320px;
    object-fit: contain;
}
.demo-modal-media iframe {
    width: 100%;
    height: 230px;
    border: none;
    display: block;
}
.demo-modal-caption {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-dimmer);
    text-align: center;
    min-height: 16px;
}