/* CSS Variables */
:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #BBDEFB;
    --secondary-color: #00BCD4;
    --accent-color: #4CAF50;
    --danger-color: #f44336;
    --warning-color: #FF9800;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 50%;
    --transition: all 0.3s ease;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 1.5rem;
    text-align: center;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
}

.tagline {
    opacity: 0.9;
    font-size: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Section Styles */
section {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Progress Section */
.progress-section {
    text-align: center;
    padding: 2rem 1.5rem;
}

.progress-circle-container {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto 1rem;
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-bg {
    fill: none;
    stroke: var(--primary-light);
    stroke-width: 12;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--primary-color);
    stroke-width: 12;
    stroke-linecap: round;
    stroke-dasharray: 565.48;
    stroke-dashoffset: 565.48;
    transition: stroke-dashoffset 0.5s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.current-intake {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.intake-separator {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin: 0 0.25rem;
}

.goal-display {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.unit {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.progress-message {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Quick Add Section */
.quick-add-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.quick-add-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-background);
    cursor: pointer;
    transition: var(--transition);
}

.quick-add-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
    transform: translateY(-2px);
}

.quick-add-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.btn-amount {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.btn-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.custom-add {
    display: flex;
    gap: 0.75rem;
}

.custom-add input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.custom-add input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Button Styles */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-secondary {
    background: var(--card-background);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--primary-light);
}

.btn-danger {
    background: var(--card-background);
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-danger:hover {
    background: #ffebee;
}

.btn-small {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--card-background);
    cursor: pointer;
    transition: var(--transition);
}

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

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Suggestions Section */
.suggestions-carousel {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 0.5rem 0;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-light) transparent;
}

.suggestions-carousel::-webkit-scrollbar {
    height: 6px;
}

.suggestions-carousel::-webkit-scrollbar-track {
    background: transparent;
}

.suggestions-carousel::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 3px;
}

.suggestion-card {
    min-width: 160px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.suggestion-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.suggestion-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

.suggestion-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.suggestion-card p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.suggest-add-btn {
    width: 100%;
    padding: 0.5rem;
    background: var(--primary-light);
    color: var(--primary-dark);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Goal Section */
.goal-presets {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.goal-preset-btn {
    flex: 1;
    min-width: 60px;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--card-background);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.goal-preset-btn:hover {
    border-color: var(--primary-color);
}

.goal-preset-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.custom-goal {
    display: flex;
    gap: 0.75rem;
}

.custom-goal input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.custom-goal input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Reminder Section */
.reminder-toggle {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: var(--transition);
    border-radius: 28px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--primary-color);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.toggle-label {
    font-weight: 500;
}

.reminder-settings {
    display: none;
    flex-direction: column;
    gap: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.reminder-settings.active {
    display: flex;
}

.reminder-interval,
.reminder-sound {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.reminder-interval label,
.reminder-sound label {
    min-width: 120px;
    color: var(--text-secondary);
}

.reminder-interval select,
.reminder-sound select {
    flex: 1;
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--card-background);
    cursor: pointer;
}

.reminder-time-range {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.time-input {
    flex: 1;
    min-width: 140px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.time-input label {
    color: var(--text-secondary);
}

.time-input input {
    flex: 1;
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}

.next-reminder {
    color: var(--primary-color);
    font-weight: 500;
    text-align: center;
    padding: 0.75rem;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
}

/* History Section */
.history-list {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.empty-history {
    text-align: center;
    color: var(--text-muted);
    padding: 1rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.history-item:last-child {
    border-bottom: none;
}

.history-time {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.history-amount {
    font-weight: 600;
    color: var(--primary-color);
}

.history-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

/* Stats Section */
.weekly-chart {
    margin-bottom: 1.5rem;
}

.chart-bars {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    height: 120px;
    padding: 0 0.5rem;
    gap: 0.5rem;
}

.chart-bar {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}

.bar-fill {
    width: 100%;
    max-width: 40px;
    background: linear-gradient(to top, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height 0.5s ease;
    margin-top: auto;
}

.bar-label {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.chart-bar.today .bar-label {
    color: var(--primary-color);
    font-weight: 600;
}

.stats-summary {
    display: flex;
    justify-content: space-around;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Footer */
.app-footer {
    background: var(--card-background);
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.app-footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.app-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.app-footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--text-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toast.success {
    background: var(--accent-color);
}

.toast.warning {
    background: var(--warning-color);
}

.toast.error {
    background: var(--danger-color);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1001;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 400px;
    width: 100%;
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.modal-content h2 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Responsive Design */
@media (max-width: 600px) {
    .app-header {
        padding: 1.5rem 1rem;
    }

    .app-header h1 {
        font-size: 1.5rem;
    }

    .main-content {
        padding: 1rem;
        gap: 1rem;
    }

    section {
        padding: 1.25rem;
    }

    .progress-circle-container {
        width: 160px;
        height: 160px;
    }

    .progress-ring {
        width: 160px;
        height: 160px;
    }

    .progress-ring-bg,
    .progress-ring-fill {
        r: 70;
        stroke-width: 10;
    }

    .progress-ring-fill {
        stroke-dasharray: 439.82;
        stroke-dashoffset: 439.82;
    }

    .current-intake {
        font-size: 2rem;
    }

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

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

    .custom-add,
    .custom-goal {
        flex-direction: column;
    }

    .custom-add input,
    .custom-goal input {
        width: 100%;
    }

    .reminder-interval,
    .reminder-sound {
        flex-direction: column;
        align-items: flex-start;
    }

    .reminder-interval select,
    .reminder-sound select {
        width: 100%;
    }

    .time-input {
        width: 100%;
    }

    .stats-summary {
        flex-direction: column;
        gap: 1rem;
    }

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

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

@media (max-width: 400px) {
    .quick-add-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .quick-add-btn {
        padding: 0.75rem 0.25rem;
    }

    .btn-icon {
        font-size: 1.25rem;
    }

    .suggestion-card {
        min-width: 140px;
    }
}

/* Print Styles */
@media print {
    .quick-add-section,
    .reminder-section,
    .suggestions-section,
    .goal-section,
    .history-actions,
    .modal,
    .toast-container {
        display: none;
    }
}

/* Dark Mode Support (optional - follows system preference) */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #121212;
        --card-background: #1e1e1e;
        --text-primary: #e0e0e0;
        --text-secondary: #b0b0b0;
        --text-muted: #808080;
        --border-color: #333333;
    }

    .progress-ring-bg {
        stroke: #333333;
    }

    .quick-add-btn:hover,
    .suggestion-card:hover {
        background: #2a2a2a;
    }

    .suggest-add-btn {
        background: rgba(33, 150, 243, 0.2);
    }

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

    .goal-preset-btn:hover {
        background: #2a2a2a;
    }

    .btn-danger:hover {
        background: rgba(244, 67, 54, 0.1);
    }

    .next-reminder {
        background: rgba(33, 150, 243, 0.2);
    }
}