:root {
    /* Background colors */
    --bg-primary: #121213;
    --bg-secondary: #1a1a1b;
    --bg-tertiary: #3a3a3c;

    /* Text colors */
    --text-primary: #ffffff;
    --text-secondary: #d7dadc;
    --text-muted: #818384;
    --text-darker: #565758;

    /* Accent colors */
    --color-success: #6aaa64;
    --color-success-dark: #538d4e;
    --color-warning: #b59f3b;
    --color-warning-light: #c5af4b;
    --color-error: #b53b3b;
    --color-error-light: #c54b4b;
    --color-whatsapp: #25D366;
    --color-whatsapp-dark: #20BA5A;

    /* Level colors (matching emoji colors) */
    --color-beginner: #b59f3b;
    --color-intermediate: #538d4e;
    --color-advanced: #6aaa64;

    /* Other */
    --border-radius: 4px;
    --border-radius-large: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
}

.container {
    max-width: 600px;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95em;
}

h2 {
    font-size: 1.3em;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

/* Today's Plank Section */
.today-section {
    background-color: var(--bg-secondary);
    padding: 25px;
    border-radius: var(--border-radius-large);
    margin-bottom: 30px;
    border: 1px solid var(--bg-tertiary);
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

input[type="number"] {
    flex: 1;
    padding: 15px;
    font-size: 1.1em;
    background-color: var(--bg-primary);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    transition: border-color 0.2s;
}

#plankCount {
    flex: 0 0 100px;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--color-success-dark);
}

.btn-primary {
    padding: 15px 30px;
    font-size: 1.1em;
    font-weight: bold;
    background-color: var(--color-success-dark);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

.status-message {
    text-align: center;
    padding: 10px;
    border-radius: var(--border-radius);
    font-weight: 500;
    min-height: 20px;
}

.status-message.success {
    background-color: rgba(83, 141, 78, 0.2);
    color: var(--color-success);
}

.status-message.error {
    background-color: rgba(181, 59, 59, 0.2);
    color: #f38ba8;
}

/* Timer Section */
.timer-section {
    background-color: var(--bg-secondary);
    padding: 25px;
    border-radius: var(--border-radius-large);
    margin-bottom: 30px;
    border: 1px solid var(--bg-tertiary);
}

.timer-setup {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.timer-input-group {
    flex: 1;
    min-width: 150px;
}

.timer-input-full {
    width: 100%;
}

.timer-input-row {
    display: flex;
    gap: 12px;
}

.timer-toggle-row {
    margin-top: 15px;
    text-align: center;
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 10px 15px;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 2px solid var(--bg-tertiary);
    transition: all 0.2s ease;
}

.toggle-label:hover {
    border-color: var(--color-success-dark);
}

.toggle-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: #e67e22;
    cursor: pointer;
}

.toggle-label input[type="checkbox"]:checked + .toggle-text {
    color: #e67e22;
}

.toggle-label input[type="checkbox"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.toggle-text {
    color: var(--text-muted);
    font-size: 0.95em;
    font-weight: 500;
}

.timer-input-group label {
    display: block;
    color: var(--text-muted);
    font-size: 0.85em;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timer-input-group input[type="number"] {
    width: 100%;
    padding: 12px;
    font-size: 1.1em;
    background-color: var(--bg-primary);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    color: #ffffff;
    transition: border-color 0.2s;
}

.timer-input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--color-success-dark);
}

.timer-input-group input[type="number"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.timer-display {
    text-align: center;
    padding: 20px;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-large);
    margin-bottom: 15px;
    border: 2px solid var(--bg-tertiary);
}

.timer-start-time {
    font-size: 0.9em;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: normal;
}

.timer-status {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--color-success);
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.timer-time {
    font-size: 4em;
    font-weight: bold;
    color: #ffffff;
    margin-bottom: 10px;
    font-family: 'Courier New', monospace;
}

.timer-progress {
    font-size: 1em;
    color: var(--text-muted);
}

.timer-controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.btn-timer {
    padding: 14px 28px;
    font-size: 1em;
    font-weight: bold;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-start {
    background-color: var(--color-success-dark);
    color: white;
}

.btn-start:hover {
    background-color: var(--color-success);
}

.btn-pause {
    background-color: var(--color-warning);
    color: white;
}

.btn-pause:hover {
    background-color: var(--color-warning-light);
}

.btn-stop {
    background-color: var(--color-error);
    color: white;
}

.btn-stop:hover {
    background-color: var(--color-error-light);
}

.btn-done {
    background-color: #e67e22;
    color: white;
}

.btn-done:hover {
    background-color: #f39c12;
}

.btn-timer:active {
    transform: scale(0.98);
}

.timer-message {
    text-align: center;
    padding: 10px;
    border-radius: var(--border-radius);
    font-weight: 500;
    min-height: 20px;
}

.timer-message.success {
    background-color: rgba(83, 141, 78, 0.2);
    color: var(--color-success);
}

.timer-message.error {
    background-color: rgba(181, 59, 59, 0.2);
    color: #f38ba8;
}

.timer-message.info {
    background-color: rgba(185, 159, 59, 0.2);
    color: var(--color-warning);
}

/* Progress Grid */
.progress-section {
    background-color: var(--bg-secondary);
    padding: 25px;
    border-radius: var(--border-radius-large);
    margin-bottom: 30px;
    border: 1px solid var(--bg-tertiary);
}

.progress-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    margin-bottom: 20px;
}

.block {
    aspect-ratio: 1;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75em;
    font-weight: bold;
    position: relative;
    cursor: pointer;
    transition: transform 0.1s;
}

.block:hover {
    transform: scale(1.1);
}

.block-empty {
    background-color: var(--bg-tertiary);
    border: 2px solid var(--bg-tertiary);
}

.block-beginner {
    background-color: var(--color-warning);
    border: 2px solid var(--color-warning);
}

.block-intermediate {
    background-color: var(--color-success-dark);
    border: 2px solid var(--color-success-dark);
}

.block-advanced {
    background-color: var(--color-success);
    border: 2px solid var(--color-success);
    box-shadow: 0 0 10px rgba(106, 170, 100, 0.5);
}

.block-today {
    border: 2px solid #ffffff;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(255, 255, 255, 0.8);
    }
}

/* Legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    padding-top: 15px;
    border-top: 1px solid var(--bg-tertiary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85em;
    color: var(--text-muted);
}

.legend-item .block {
    width: 20px;
    height: 20px;
}

/* Stats Section */
.stats-section {
    background-color: var(--bg-secondary);
    padding: 25px;
    border-radius: var(--border-radius-large);
    margin-bottom: 30px;
    border: 1px solid var(--bg-tertiary);
}

.stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.stats-header h2 {
    margin-bottom: 0;
}

.btn-settings {
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    padding: 5px 10px;
    transition: transform 0.2s, opacity 0.2s;
    opacity: 0.7;
}

.btn-settings:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.stat-card {
    background-color: var(--bg-primary);
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--bg-tertiary);
}

.stat-card-beginner {
    border-color: var(--color-warning);
}

.stat-card-beginner .stat-value {
    color: var(--color-warning);
}

.stat-card-intermediate {
    border-color: var(--color-success-dark);
}

.stat-card-intermediate .stat-value {
    color: var(--color-success-dark);
}

.stat-card-advanced {
    border-color: var(--color-success);
}

.stat-card-advanced .stat-value {
    color: var(--color-success);
}

.stat-value {
    font-size: 2em;
    font-weight: bold;
    color: var(--color-success);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.85em;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Share Section */
.share-section {
    text-align: center;
    margin-bottom: 30px;
}

.share-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-whatsapp {
    padding: 18px 50px;
    font-size: 1.3em;
    font-weight: bold;
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
    flex: 2;
    min-width: 250px;
    background-color: var(--color-whatsapp);
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover {
    background-color: var(--color-whatsapp-dark);
    box-shadow: 0 6px 16px rgba(37, 211, 102, 0.4);
    transform: translateY(-2px);
}

.btn-whatsapp:active {
    transform: scale(0.98);
}

.btn-share {
    padding: 12px 30px;
    font-size: 0.95em;
    font-weight: normal;
    color: var(--text-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
    min-width: 150px;
    background-color: transparent;
}

.btn-share:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-darker);
}

.btn-share:active {
    transform: scale(0.98);
}

.share-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: var(--border-radius);
    font-weight: 500;
    min-height: 20px;
}

.share-message.success {
    background-color: rgba(83, 141, 78, 0.2);
    color: var(--color-success);
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-darker);
    font-size: 0.85em;
    border-top: 1px solid var(--bg-tertiary);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--border-radius-large);
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content h2 {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.modal-content h3 {
    color: var(--text-secondary);
    font-size: 1.1em;
    margin-bottom: 10px;
}

.option-description {
    color: var(--text-muted);
    font-size: 0.9em;
    margin-bottom: 15px;
}

.settings-option {
    background-color: var(--bg-primary);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border: 1px solid var(--bg-tertiary);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--color-accent);
    cursor: pointer;
}

.clear-stats-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.clear-stats-controls label {
    color: var(--text-secondary);
}

.clear-stats-controls input {
    width: 80px;
    padding: 8px;
    font-size: 1em;
    background-color: var(--bg-primary);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    color: #ffffff;
}

.clear-stats-controls span {
    color: var(--text-muted);
}

.btn-danger {
    padding: 12px 24px;
    font-size: 1em;
    font-weight: bold;
    background-color: var(--color-error);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-danger:active {
    transform: scale(0.98);
}

.btn-secondary {
    padding: 12px 24px;
    font-size: 1em;
    font-weight: bold;
    background-color: var(--bg-tertiary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-secondary:hover {
    background-color: var(--text-darker);
}

.btn-secondary:active {
    transform: scale(0.98);
}

.confirm-message {
    color: var(--text-secondary);
    font-size: 1.1em;
    margin-bottom: 25px;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* Results Modal Styles */
.results-modal {
    text-align: center;
}

.results-header {
    margin-bottom: 30px;
}

.results-header h2 {
    font-size: 1.8em;
    margin: 0;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-large);
    border: 1px solid var(--bg-tertiary);
}

.result-stat {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.result-label {
    font-size: 0.85em;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: 2em;
    font-weight: bold;
    color: var(--color-success);
    font-family: 'Courier New', monospace;
}

.result-unit {
    font-size: 0.75em;
    color: var(--text-muted);
}

.results-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.results-buttons .btn-whatsapp {
    width: 100%;
}

.results-buttons .btn-share {
    width: 100%;
}

.results-buttons .btn-secondary {
    width: 100%;
}

/* View State Management */
/* Hide sections when timer is active */
[data-view="timer-active"] .hide-on-timer-active {
    display: none !important;
}

/* Center and enlarge timer when active */
[data-view="timer-active"] .timer-section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 40px 25px;
}

[data-view="timer-active"] .timer-display {
    margin: 40px 0;
}

[data-view="timer-active"] .timer-time {
    font-size: 6em;
}

[data-view="timer-active"] .timer-status {
    font-size: 2em;
}

[data-view="timer-active"] .timer-progress {
    font-size: 1.3em;
}

[data-view="timer-active"] .timer-start-time {
    font-size: 1.1em;
}

[data-view="timer-active"] .timer-controls {
    margin-top: 30px;
}

/* Responsive Design */
@media (max-width: 500px) {
    h1 {
        font-size: 2em;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .progress-grid {
        gap: 3px;
    }

    .input-group {
        flex-direction: column;
    }

    .timer-setup {
        flex-direction: column;
    }

    .timer-time {
        font-size: 3em;
    }

    .timer-section {
        padding-bottom: 40px;
    }

    .timer-controls {
        flex-direction: column;
    }

    .btn-timer {
        width: 100%;
        padding: 16px 20px;
        font-size: 1.05em;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions button {
        width: 100%;
    }

    /* Mobile-optimized share buttons */
    .share-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .btn-whatsapp {
        width: 100%;
        min-width: unset;
        padding: 20px 30px;
        font-size: 1.2em;
    }

    .btn-share {
        width: 100%;
        min-width: unset;
        padding: 14px 25px;
        font-size: 0.9em;
    }

    /* Larger touch targets for mobile */
    button {
        min-height: 44px;
    }

    /* Better spacing on mobile */
    .container {
        padding: 10px;
    }

    /* Adjust input sizes for mobile */
    input[type="number"] {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    /* Timer-active view adjustments for mobile */
    [data-view="timer-active"] .timer-time {
        font-size: 4em;
    }

    [data-view="timer-active"] .timer-status {
        font-size: 1.5em;
    }

    [data-view="timer-active"] .timer-progress {
        font-size: 1.1em;
    }

    [data-view="timer-active"] .timer-section {
        min-height: 50vh;
        padding: 30px 15px;
    }
}