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

:root {
    --color-primary: #1a6b4a;
    --color-primary-dark: #145438;
    --color-primary-light: #e8f5ee;
    --color-danger: #c0392b;
    --color-danger-light: #fdecea;
    --color-bg: #f5f6f8;
    --color-white: #ffffff;
    --color-text: #1a1a1a;
    --color-text-light: #666;
    --color-border: #ddd;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --radius: 10px;
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

/* === Layout === */
.app-container {
    max-width: 480px;
    margin: 0 auto;
    padding: 16px;
    min-height: 100vh;
}

/* === Typography === */
h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.25rem; font-weight: 600; }

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    text-decoration: none;
    width: 100%;
}

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

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

.btn-secondary {
    background: var(--color-white);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-bg); }

.btn-danger {
    background: var(--color-danger);
    color: white;
}
.btn-danger:hover { background: #a93226; }

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary-light); }

.btn-small {
    min-height: 36px;
    padding: 8px 16px;
    font-size: 0.875rem;
    width: auto;
}

.btn-icon {
    min-height: 40px;
    width: 40px;
    padding: 0;
    border-radius: 8px;
    font-size: 1.1rem;
}

/* === Forms === */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    min-height: 48px;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--color-white);
    transition: border-color var(--transition);
}

/* === Password toggle === */
.input-password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-password-wrapper input {
    flex: 1;
    padding-right: 48px;
}

.btn-toggle-password {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    padding: 4px;
    line-height: 1;
    color: var(--color-text-light);
    min-height: unset;
    width: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
    transition: opacity var(--transition);
}

.btn-toggle-password:hover {
    opacity: 1;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

/* === Radio buttons === */
.radio-group {
    display: flex;
    gap: 12px;
}

.radio-option {
    flex: 1;
}

.radio-option input[type="radio"] {
    display: none;
}

.radio-option label {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition);
}

.radio-option input[type="radio"]:checked + label {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* === Cards === */
.card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: 0 1px 4px var(--color-shadow);
    margin-bottom: 12px;
}

/* === Header === */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    margin-bottom: 16px;
}

.app-header h1 {
    font-size: 1.3rem;
}

/* === Auth Pages === */
.auth-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 80vh;
}

.auth-title {
    text-align: center;
    margin-bottom: 32px;
}

.auth-title h1 {
    font-size: 1.6rem;
    margin-bottom: 4px;
}

.auth-title p {
    color: var(--color-text-light);
}

.auth-switch {
    text-align: center;
    margin-top: 20px;
    color: var(--color-text-light);
}

.auth-switch a {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

/* === Exercise List === */
.exercise-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.exercise-handle {
    cursor: grab;
    color: var(--color-text-light);
    font-size: 1.2rem;
    padding: 4px;
    user-select: none;
    touch-action: none;
}

.exercise-handle:active { cursor: grabbing; }

.exercise-info {
    flex: 1;
    min-width: 0;
}

.exercise-name {
    font-weight: 600;
    font-size: 1rem;
}

.exercise-duration {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    background: var(--color-primary-light);
    border-radius: 20px;
    padding: 2px 8px;
    margin-top: 5px;
}

.exercise-details {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 2px;
}

.exercise-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.empty-state {
    text-align: center;
    padding: 48px 16px;
    color: var(--color-text-light);
}

.empty-state p {
    margin-bottom: 16px;
    font-size: 1.1rem;
}

/* === Dragging === */
.exercise-card.dragging {
    opacity: 0.5;
    transform: scale(0.98);
}

.exercise-card.drag-over {
    border-top: 3px solid var(--color-primary);
}

/* === Session (Guided Workout) === */
.session-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 16px;
    max-width: 480px;
    margin: 0 auto;
}

.session-header {
    text-align: center;
    padding: 16px 0;
}

.session-exercise-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.session-exercise-desc {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

.session-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px 0;
}

.session-state {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    color: var(--color-primary);
}

.session-state.rest {
    color: var(--color-danger);
}

.session-series {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.session-timer {
    font-size: 4rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    margin-bottom: 12px;
}

.session-reps-info {
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--color-text);
}

.session-done-btn {
    margin-top: 16px;
}

.session-footer {
    padding: 16px 0;
    position: relative;
    z-index: 60;
}

.session-progress {
    margin-bottom: 16px;
}

.session-progress-text {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 6px;
    text-align: center;
}

.session-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
}

.session-progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.session-controls {
    display: flex;
    gap: 12px;
}

.session-controls .btn {
    flex: 1;
}

/* === Session Complete === */
.session-complete {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    text-align: center;
}

.session-complete h1 {
    font-size: 2rem;
    margin-bottom: 8px;
}

.session-complete p {
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

/* === Alerts === */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.alert-error {
    background: var(--color-danger-light);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

.alert-success {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    border: 1px solid var(--color-primary);
}

/* === Utility === */
.hidden { display: none !important; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.gap-12 { gap: 12px; }
.flex-row { display: flex; gap: 12px; }
.flex-row > * { flex: 1; }

/* === Confirm Dialog === */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 16px;
}

.modal-box {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 360px;
    width: 100%;
    text-align: center;
}

.modal-box h2 {
    margin-bottom: 8px;
}

.modal-box p {
    color: var(--color-text-light);
    margin-bottom: 20px;
}

.modal-actions {
    display: flex;
    gap: 12px;
}

.modal-actions .btn { flex: 1; }

/* === Header actions === */
.header-actions {
    display: flex;
    gap: 8px;
}

/* === Stats Page === */
.stats-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    box-shadow: 0 1px 4px var(--color-shadow);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Weekly chart */
.weekly-chart {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.weekly-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.weekly-label {
    font-size: 0.8rem;
    color: var(--color-text-light);
    min-width: 70px;
    text-align: right;
}

.weekly-bar-container {
    flex: 1;
    height: 24px;
    background: var(--color-bg);
    border-radius: 4px;
    overflow: hidden;
}

.weekly-bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: 4px;
    min-width: 2px;
    transition: width 0.4s ease;
}

.weekly-value {
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 30px;
}

/* History */
.history-item {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: 0 1px 4px var(--color-shadow);
    margin-bottom: 10px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.history-date {
    font-weight: 600;
    font-size: 0.95rem;
}

.history-badge {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
}

.history-badge.complete {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.history-badge.partial {
    background: #fff3e0;
    color: #e65100;
}

.history-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
}

.history-exercises {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.history-exercise-tag {
    font-size: 0.75rem;
    background: var(--color-bg);
    color: var(--color-text-light);
    padding: 3px 8px;
    border-radius: 6px;
}

.history-toggle {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    padding: 4px 0;
    margin-top: 4px;
}

.empty-state-small {
    text-align: center;
    padding: 24px 16px;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Session summary */
.session-summary {
    width: 100%;
    max-width: 300px;
    margin-top: 24px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-bg);
}

.summary-row:last-child {
    border-bottom: none;
}

/* === History detail page === */
.history-detail-card {
    margin-bottom: 14px;
}

.history-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.history-detail-date {
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: capitalize;
}

.history-detail-time {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.history-detail-stats {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-bg);
}

.history-detail-exercises {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-exercise-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-exercise-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.85rem;
}

.history-exercise-info strong {
    font-size: 0.9rem;
}

.history-exercise-info span {
    color: var(--color-text-light);
    font-size: 0.8rem;
}

.history-exercise-bar {
    height: 6px;
    background: var(--color-bg);
    border-radius: 3px;
    overflow: hidden;
}

.history-exercise-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* === Exercise image === */
.exercise-card-img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 10px;
    object-fit: cover;
    max-height: 200px;
}

.image-preview {
    position: relative;
    margin-bottom: 8px;
}

.image-preview img {
    width: 100%;
    border-radius: 8px;
    object-fit: cover;
    max-height: 200px;
}

.btn-remove-image {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 50%;
    background: rgba(0,0,0,0.6);
    color: white;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.session-exercise-img {
    width: 100%;
    max-height: 160px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 10px;
}

/* === Steps editor === */
.step-item {
    display: flex;
    gap: 8px;
    align-items: flex-start;
    margin-bottom: 8px;
    background: var(--color-bg);
    border-radius: 8px;
    padding: 10px;
}

.step-number {
    min-width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 4px;
}

.step-fields {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.step-fields textarea {
    width: 100%;
    min-height: 48px;
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.9rem;
    resize: vertical;
    font-family: inherit;
}

.step-fields textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.step-duration-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.step-duration-row input {
    width: 80px;
    min-height: 32px;
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.85rem;
}

.btn-remove-step {
    min-height: 28px;
    width: 28px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-danger);
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 4px;
    flex-shrink: 0;
}

.btn-remove-step:hover {
    background: var(--color-danger-light);
}

.label-hint {
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

/* === Session steps display === */
.session-step-info {
    margin-bottom: 16px;
    text-align: center;
}

.session-step-label {
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.session-step-instruction {
    font-size: 1.2rem;
    line-height: 1.4;
    max-width: 340px;
    margin: 0 auto;
    white-space: pre-line;
}

/* === Exercise card step count === */
.exercise-steps-count {
    font-size: 0.8rem;
    color: var(--color-primary);
    font-weight: 600;
}

/* === Pause overlay === */
.pause-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}

.pause-overlay h2 {
    color: white;
    font-size: 2rem;
}