:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --primary-color: #2979ff;
    --accent-color: #448aff;
    --text-main: #ffffff;
    --text-dim: #b0b0b0;
    --input-bg: #2c2c2c;
    --border-color: #333333;
    --danger: #ff5252;
    --success: #69f0ae;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.4;
    -webkit-tap-highlight-color: transparent;
}

header {
    background-color: var(--card-bg);
    padding: 0.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

nav {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
}

nav button {
    background: none;
    border: none;
    color: var(--text-dim);
    padding: 0.25rem 0.75rem;
    font-size: 0.9rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

nav button.active {
    color: var(--text-main);
    border-bottom-color: var(--primary-color);
}

main {
    padding: 0.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.view {
    display: block;
}

.view.hidden {
    display: none !important;
}

.days-since-log-container {
    text-align: center;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--text-dim);
    font-weight: 500;
}

.days-since-log-container b {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.days-since-log-container.warning b {
    color: var(--danger);
}

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

@media (min-width: 768px) {
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    }
}

.card {
    background-color: var(--card-bg);
    padding: 0.6rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.2rem;
}

.card h3 {
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.measurement-layout {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 0.75rem;
}

.input-section {
    flex: 0 0 120px;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.stepper-container {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stepper-container input {
    width: 100%;
    text-align: center;
    padding: 0.4rem;
    font-size: 1.1rem;
    height: 34px;
}

.stepper-btns {
    display: flex;
    gap: 0.25rem;
}

.stepper-btns .step-btn {
    flex: 1;
    height: 30px;
    font-weight: bold;
    font-size: 1.1rem;
}

.feedback-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    min-width: 0;
}

.info-row {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem;
}

.sub-label {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.sub-label b {
    font-size: 0.95rem;
    color: var(--text-main);
    font-weight: 800;
}

.result {
    background-color: rgba(41, 121, 255, 0.08);
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    border-left: 3px solid var(--primary-color);
    font-size: 0.85rem;
}

.result p {
    margin-bottom: 0.1rem;
}

.result p:last-child {
    margin-bottom: 0;
}

.result span {
    font-weight: bold;
    color: var(--success);
}

.recommendation {
    font-size: 0.8rem;
    color: var(--text-dim);
    background: rgba(255,255,255,0.03);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
}

.recommendation b {
    color: var(--success);
    font-weight: 800;
}

.suggestions-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-dim);
    padding: 0.1rem 0.4rem;
    font-size: 0.7rem;
    border-radius: 4px;
    cursor: pointer;
}

.suggestions-panel {
    background: rgba(0,0,0,0.2);
    padding: 0.5rem;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    border: 1px dashed var(--border-color);
}

.suggestion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 0.4rem;
    font-size: 0.75rem;
}

.suggestion-grid div {
    display: flex;
    flex-direction: column;
}

.suggestion-grid span {
    color: var(--success);
    font-weight: bold;
}

.log-section-card {
    grid-column: 1 / -1;
    margin-top: 0.25rem;
}

.log-section-header {
    font-size: 1rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.2rem;
}

.log-controls-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

@media (min-width: 900px) {
    .log-controls-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
    }
}

.input-group {
    margin-bottom: 0.5rem;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 0.2rem;
}

input[type="number"], input[type="date"], select, textarea {
    width: 100%;
    padding: 0.4rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.4rem;
}

.checkbox-grid label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.8rem;
    cursor: pointer;
}

textarea {
    height: 60px;
    resize: none;
}

.primary-btn {
    width: 100%;
    padding: 0.6rem;
    border-radius: 6px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    font-size: 0.95rem;
    font-weight: bold;
    cursor: pointer;
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.secondary-btn {
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    border: 1px solid var(--primary-color);
    background: none;
    color: var(--text-main);
    cursor: pointer;
    font-size: 0.8rem;
}

.step-btn {
    border-radius: 4px;
    border: none;
    background-color: var(--primary-color);
    color: white;
}

.task-manager-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.task-manager-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem;
    background: rgba(255,255,255,0.02);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
}

.task-manager-btns {
    display: flex;
    gap: 0.2rem;
}

.task-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-dim);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}

.task-btn:hover:not(:disabled) {
    color: var(--text-main);
    border-color: var(--primary-color);
}

.task-btn.delete-task {
    color: var(--danger);
}

.task-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.warning {
    margin-top: 0.25rem;
    color: var(--danger);
    font-weight: bold;
    font-size: 0.75rem;
}

.header-with-action {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

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

.log-item {
    background: var(--card-bg);
    padding: 0.6rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.log-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.3rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.2rem;
}

.log-item-date {
    font-weight: bold;
    font-size: 0.85rem;
    color: var(--accent-color);
}

.log-item-stats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 0.25rem;
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
}

.log-item-maint {
    font-size: 0.75rem;
    color: var(--success);
    margin-bottom: 0.2rem;
}

.log-item-notes {
    font-size: 0.75rem;
    font-style: italic;
    color: var(--text-dim);
}

.btn-delete {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 0.7rem;
}

.toast {
    position: fixed;
    top: 5rem; /* Moved from bottom to prevent overlapping submit button */
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    z-index: 1000;
    font-weight: bold;
    font-size: 0.9rem;
}

.hidden {
    display: none !important;
}