/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Colors */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;

    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;

    --emerald-50: #ecfdf5;
    --emerald-500: #10b981;
    --emerald-600: #059669;

    --red-50: #fef2f2;
    --red-400: #f87171;
    --red-500: #ef4444;

    --white: #ffffff;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
}

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

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--slate-100) 100%);
    min-height: 100vh;
    color: var(--slate-800);
    line-height: 1.6;
    padding: 1rem;
}

@media (min-width: 768px) {
    body {
        padding: 2rem;
    }
}

/* ========================================
   App Container
   ======================================== */
.app-container {
    max-width: 28rem;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--slate-100);
    position: relative;
}

/* ========================================
   Header
   ======================================== */
.app-header {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    padding: 1.5rem;
    text-align: center;
    color: var(--white);
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.app-header h1 svg {
    opacity: 0.9;
}

.app-header .subtitle {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 0.25rem;
}

/* ========================================
   Calendar Section
   ======================================== */
.calendar-section {
    padding: 1rem;
    background: var(--white);
    border-bottom: 1px solid var(--slate-100);
}

.calendar-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding: 0 0.5rem;
}

.nav-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--slate-600);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--slate-100);
    color: var(--slate-800);
}

.nav-btn:active {
    transform: scale(0.95);
}

.current-month {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--slate-800);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.25rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.weekday {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--slate-400);
    padding: 0.25rem;
}

.weekday.sunday {
    color: var(--red-400);
}

.weekday.saturday {
    color: var(--primary-400);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.25rem;
}

.day-cell {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--slate-700);
    position: relative;
}

.day-cell:hover:not(.empty):not(.selected) {
    background: var(--primary-50);
}

.day-cell.empty {
    cursor: default;
}

.day-cell.today:not(.selected) {
    border: 2px solid var(--primary-200);
}

.day-cell.selected {
    background: var(--primary-600);
    color: var(--white);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.day-cell.sunday {
    color: var(--red-400);
}

.day-cell.sunday.selected {
    color: var(--white);
}

.day-cell.saturday {
    color: var(--primary-400);
}

.day-cell.saturday.selected {
    color: var(--white);
}

.day-indicator {
    width: 4px;
    height: 4px;
    border-radius: var(--radius-full);
    background: var(--primary-400);
    margin-top: 2px;
}

.day-cell.selected .day-indicator {
    background: var(--white);
}

/* ========================================
   Entries Section
   ======================================== */
.entries-section {
    padding: 1.5rem;
    min-height: 300px;
    background: linear-gradient(180deg, var(--slate-50) 0%, var(--white) 100%);
}

/* Search Bar */
.search-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--white);
    border: 2px solid var(--slate-200);
    border-radius: var(--radius-xl);
    padding: 0.5rem 1rem;
    margin-bottom: 1rem;
    transition: border-color var(--transition-fast);
}

.search-bar:focus-within {
    border-color: var(--primary-400);
}

.search-bar svg {
    color: var(--slate-400);
    flex-shrink: 0;
}

.search-bar input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 0.875rem;
    color: var(--slate-700);
    background: transparent;
}

.search-bar input::placeholder {
    color: var(--slate-400);
}

.clear-search-btn {
    background: none;
    border: none;
    color: var(--slate-400);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0 0.25rem;
    line-height: 1;
}

.clear-search-btn:hover {
    color: var(--slate-600);
}

.entries-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.entries-header h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--slate-700);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.date-badge {
    background: var(--primary-100);
    color: var(--primary-700);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.add-btn {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--primary-600);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-lg), 0 4px 12px -2px rgba(99, 102, 241, 0.3);
    transition: all var(--transition-fast);
}

.add-btn:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
}

.add-btn:active {
    transform: scale(0.95);
}

/* Input Form */
.input-form {
    margin-bottom: 1.5rem;
    animation: slideIn var(--transition-slow) ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Category Selector */
.category-select-wrapper {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.category-select {
    flex: 1;
    padding: 0.625rem 1rem;
    border: 2px solid var(--slate-200);
    border-radius: var(--radius-lg);
    background: var(--white);
    color: var(--slate-700);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.category-select:focus {
    outline: none;
    border-color: var(--primary-500);
}

.add-category-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    border: 2px solid var(--slate-200);
    border-radius: var(--radius-lg);
    background: var(--white);
    color: var(--slate-500);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.add-category-btn:hover {
    border-color: var(--primary-400);
    color: var(--primary-600);
    background: var(--primary-50);
}

.input-form textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--primary-100);
    border-radius: var(--radius-xl);
    resize: none;
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--slate-700);
    transition: border-color var(--transition-fast);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.input-form textarea:focus {
    outline: none;
    border-color: var(--primary-500);
}

.input-form textarea::placeholder {
    color: var(--slate-400);
}

.input-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.cancel-btn {
    background: none;
    border: none;
    color: var(--slate-400);
    font-weight: 500;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.cancel-btn:hover {
    color: var(--slate-600);
}

.save-btn {
    background: var(--primary-600);
    color: var(--white);
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
}

.save-btn:hover:not(:disabled) {
    background: var(--primary-700);
}

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

/* Entries List */
.entries-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--slate-400);
    font-style: italic;
    font-size: 0.875rem;
}

.entry-card {
    background: var(--white);
    padding: 1rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--slate-100);
    border-left: 4px solid var(--slate-300);
    transition: all var(--transition-fast);
    animation: fadeIn var(--transition-normal) ease;
}

.entry-card.private {
    border-left-color: var(--emerald-500);
}

.entry-card.work {
    border-left-color: var(--primary-500);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.entry-card:hover {
    box-shadow: var(--shadow-md);
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.entry-time {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-400);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.entry-time svg {
    width: 12px;
    height: 12px;
}

.delete-btn {
    background: none;
    border: none;
    color: var(--slate-300);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: all var(--transition-fast);
}

.entry-card:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    color: var(--red-500);
    background: var(--red-50);
}

.entry-text {
    font-size: 0.875rem;
    color: var(--slate-700);
    white-space: pre-wrap;
    line-height: 1.5;
}

/* ========================================
   Footer
   ======================================== */
.app-footer {
    padding: 1rem;
    background: var(--white);
    border-top: 1px solid var(--slate-100);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.sync-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--emerald-600);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.sync-btn:hover {
    background: var(--emerald-50);
}

.sync-status {
    font-size: 0.75rem;
    color: var(--slate-500);
}

.sync-status.success {
    color: var(--emerald-500);
}

.sync-status.error {
    color: var(--red-500);
}

/* ========================================
   Settings Button & Modal
   ======================================== */
.settings-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--white);
    padding: 0.5rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 100;
    animation: fadeIn var(--transition-fast) ease;
}

.modal-content {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 24rem;
    box-shadow: var(--shadow-xl);
}

.modal-content h3 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--slate-700);
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--slate-200);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-500);
}

.form-group small {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--slate-500);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

/* Color Picker */
.color-picker {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.color-option {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    border: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.active {
    border-color: var(--slate-800);
    box-shadow: 0 0 0 2px var(--white), 0 0 0 4px var(--slate-300);
}

/* Category List */
.divider {
    border: none;
    border-top: 1px solid var(--slate-200);
    margin: 1rem 0;
}

.category-list {
    max-height: 200px;
    overflow-y: auto;
}

.category-list-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.category-list-item:hover {
    background: var(--slate-50);
}

.category-color-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.category-name {
    flex: 1;
    font-size: 0.875rem;
    color: var(--slate-700);
}

.category-delete-btn {
    background: none;
    border: none;
    color: var(--slate-300);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: all var(--transition-fast);
}

.category-list-item:hover .category-delete-btn {
    opacity: 1;
}

.category-delete-btn:hover {
    color: var(--red-500);
    background: var(--red-50);
}

/* Search Results Header */
.search-results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--slate-200);
}

.search-results-header span {
    font-size: 0.75rem;
    color: var(--slate-500);
}

/* ========================================
   Loading Overlay
   ======================================== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--primary-100);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
    display: none !important;
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 374px) {
    body {
        padding: 0.5rem;
    }

    .app-header {
        padding: 1rem;
    }

    .app-header h1 {
        font-size: 1.25rem;
    }

    .calendar-section {
        padding: 0.75rem;
    }

    .entries-section {
        padding: 1rem;
    }

    .day-cell {
        font-size: 0.8125rem;
    }
}