/* ============================================================================
   PlayDate Frontend - Global Styles & Theme
   ============================================================================ */

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

:root {
    /* Color Palette */
    --primary-color: #0891b2;
    --primary-light: #06b6d4;
    --primary-dark: #0e7490;
    --secondary-color: #f59e0b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Neutrals */
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing (8px base system) */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    font-size: var(--font-size-base);
}

html, body, #app {
    height: 100%;
    width: 100%;
}

/* ============================================================================
   Typography
   ============================================================================ */

h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

p {
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
}

/* ============================================================================
   Layout & Navigation
   ============================================================================ */

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    white-space: nowrap;
}

.header-logo-icon {
    font-size: 28px;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.search-bar {
    display: none;
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    background-color: var(--bg-light);
    transition: all var(--transition-fast);
}

.search-bar:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.user-avatar:hover {
    transform: scale(1.1);
}

.main-content {
    flex: 1;
    margin-top: 72px;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

/* ============================================================================
   Home Feed
   ============================================================================ */

.feed-container {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.feed-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.feed-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-dark);
}

.filter-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    padding-bottom: var(--spacing-md);
}

.filter-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: none;
    color: var(--text-gray);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.filter-tab:hover {
    color: var(--text-dark);
}

.filter-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.feed-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ============================================================================
   Card Components
   ============================================================================ */

.card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* Polling Card */
.polling-card {
    border-left: 4px solid var(--primary-color);
    position: relative;
}

.polling-card.high-priority {
    border-left-width: 6px;
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.02) 0%, transparent 100%);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-dark);
}

.card-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--primary-light);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-gray);
}

.card-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.card-status {
    color: var(--danger-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.card-participants {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-gray);
}

.card-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* Locked Date Card */
.locked-date-card {
    border-left: 4px solid var(--success-color);
}

.locked-date-card .card-badge {
    background-color: var(--success-color);
}

.event-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.event-detail-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-gray);
}

.event-detail-icon {
    font-size: 18px;
    width: 20px;
    text-align: center;
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
    text-decoration: none;
    font-family: inherit;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-light);
    border-color: var(--text-gray);
}

.btn-ghost {
    background: none;
    color: var(--primary-color);
    border: none;
}

.btn-ghost:hover:not(:disabled) {
    background-color: rgba(8, 145, 178, 0.1);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

/* ============================================================================
   Floating Action Button
   ============================================================================ */

.fab {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    z-index: 50;
}

.fab:hover {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-xl);
    transform: scale(1.1);
}

.fab:active {
    transform: scale(0.95);
}

/* ============================================================================
   Modal & Overlay
   ============================================================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    animation: fadeIn var(--transition-base);
    padding: var(--spacing-md);
}

.modal {
    background-color: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp var(--transition-base);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-gray);
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-dark);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ============================================================================
   Form Elements
   ============================================================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-dark);
    font-size: var(--font-size-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    color: var(--danger-color);
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
}

/* ============================================================================
   Participant Selector
   ============================================================================ */

.participant-selector {
    position: relative;
}

.participant-search {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
}

.participant-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.participant-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--primary-light);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
}

.participant-remove {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
    padding: 0;
    margin-left: var(--spacing-xs);
}

.participant-suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-sm);
}

.participant-suggestion-btn {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    font-size: var(--font-size-sm);
}

.participant-suggestion-btn:hover {
    border-color: var(--primary-color);
    background-color: rgba(8, 145, 178, 0.05);
}

/* ============================================================================
   Time Slot Selection
   ============================================================================ */

.time-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.time-slot {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    background-color: var(--bg-white);
}

.time-slot:hover {
    border-color: var(--primary-color);
    background-color: rgba(8, 145, 178, 0.05);
}

.time-slot.free {
    border-color: var(--success-color);
}

.time-slot.free:hover {
    background-color: rgba(16, 185, 129, 0.05);
}

.time-slot.busy {
    background-color: var(--border-light);
    color: var(--text-light);
    cursor: not-allowed;
    opacity: 0.6;
}

.time-slot.selected {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.time-slot-time {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.time-slot-status {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* ============================================================================
   Step Indicator
   ============================================================================ */

.step-indicator {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.step-indicator::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--border-color);
    z-index: -1;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: var(--border-light);
    color: var(--text-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.step.active .step-number {
    background-color: var(--primary-color);
    color: white;
}

.step.completed .step-number {
    background-color: var(--success-color);
    color: white;
}

.step-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-gray);
    text-align: center;
}

.step.active .step-label {
    color: var(--primary-color);
}

/* ============================================================================
   Polling Response Page
   ============================================================================ */

.poll-container {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

.poll-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.poll-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.poll-organizer {
    font-size: var(--font-size-sm);
    color: var(--text-gray);
}

.poll-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.poll-option {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background-color: var(--bg-white);
}

.poll-option:hover {
    border-color: var(--primary-color);
    background-color: rgba(8, 145, 178, 0.02);
}

.poll-option.selected {
    border-color: var(--primary-color);
    background-color: rgba(8, 145, 178, 0.1);
}

.poll-option-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.poll-option.selected .poll-option-checkbox {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.poll-option-content {
    flex: 1;
}

.poll-option-time {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.poll-option-availability {
    font-size: var(--font-size-xs);
    color: var(--text-gray);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.poll-option-availability.free {
    color: var(--success-color);
}

.poll-option-availability.busy {
    color: var(--danger-color);
}

.poll-option-votes {
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
}

.poll-vote-count {
    font-weight: 600;
    color: var(--text-dark);
}

.poll-vote-label {
    font-size: var(--font-size-xs);
    color: var(--text-gray);
}

/* ============================================================================
   Location Suggestion
   ============================================================================ */

.location-suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.location-card {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    background-color: var(--bg-white);
}

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

.location-name {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.location-address {
    font-size: var(--font-size-sm);
    color: var(--text-gray);
    margin-bottom: var(--spacing-xs);
}

.location-distance {
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    font-weight: 600;
}

/* ============================================================================
   Empty State
   ============================================================================ */

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-gray);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

.empty-state-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.empty-state-description {
    margin-bottom: var(--spacing-lg);
}

/* ============================================================================
   Animations
   ============================================================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

/* ============================================================================
   Notes Feature
   ============================================================================ */

.notes-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.notes-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.notes-search {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    min-width: 250px;
    font-size: var(--font-size-sm);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.note-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.note-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.note-card.pinned {
    border-left: 4px solid var(--primary-color);
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.note-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
    color: var(--text-dark);
    flex: 1;
    margin-right: var(--spacing-md);
}

.note-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.note-action-btn {
    background: none;
    border: none;
    color: var(--text-gray);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.note-action-btn:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.note-content {
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    white-space: pre-line;
    flex: 1;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 8;
    -webkit-box-orient: vertical;
}

.note-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

.note-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.note-tag {
    background: var(--bg-light);
    color: var(--text-gray);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
}

.note-date {
    font-size: var(--font-size-xs);
    color: var(--text-light);
}

/* Note Editor */
.note-editor {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
}

.note-editor-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.note-editor-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    border: none;
    width: 100%;
    padding: var(--spacing-sm) 0;
    font-family: inherit;
    color: var(--text-dark);
}

.note-editor-title:focus {
    outline: none;
    border-bottom: 2px solid var(--primary-color);
}

.note-editor-content {
    min-height: 400px;
    padding: var(--spacing-lg);
    border: none;
    width: 100%;
    resize: none;
    font-family: inherit;
    line-height: 1.6;
    color: var(--text-gray);
}

.note-editor-content:focus {
    outline: none;
}

.note-editor-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.note-tag-input {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
}

/* Empty State */
.notes-empty-state {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    grid-column: 1 / -1;
}

.notes-empty-icon {
    font-size: 64px;
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
}

.notes-empty-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.notes-empty-description {
    color: var(--text-gray);
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .notes-grid {
        grid-template-columns: 1fr;
    }
    
    .notes-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .notes-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .notes-search {
        width: 100%;
    }
}

/* ============================================================================
   Responsive Design
   ============================================================================ */

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .header-logo {
        font-size: var(--font-size-lg);
    }

    .header-logo-icon {
        font-size: 24px;
    }

    .header-center {
        display: none;
    }

    .search-bar {
        display: block;
        max-width: 100%;
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .feed-container {
        max-width: 100%;
    }

    .modal {
        max-width: 100%;
        max-height: 100vh;
        border-radius: 0;
    }

    .modal-overlay {
        padding: 0;
    }

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

    .fab {
        width: 48px;
        height: 48px;
        font-size: 24px;
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }

    .card {
        padding: var(--spacing-md);
    }

    .filter-tabs {
        gap: var(--spacing-xs);
        padding-bottom: var(--spacing-sm);
    }

    .filter-tab {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }

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

    .btn {
        width: 100%;
    }

    .modal-footer {
        flex-direction: column-reverse;
    }

    .modal-footer .btn {
        width: 100%;
    }

    .location-suggestions {
        grid-template-columns: 1fr;
    }

    .time-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .step-indicator {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .step-indicator::before {
        display: none;
    }

    .step {
        flex-direction: row;
        gap: var(--spacing-md);
    }

    .step-label {
        text-align: left;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 16px;
        --spacing-xl: 24px;
        --font-size-2xl: 20px;
        --font-size-xl: 18px;
    }

    .header {
        padding: var(--spacing-sm);
    }

    .header-logo {
        font-size: var(--font-size-base);
    }

    .header-logo-icon {
        font-size: 20px;
    }

    .main-content {
        padding: var(--spacing-sm);
    }

    .card {
        padding: var(--spacing-md);
    }

    .btn-large {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    .time-grid {
        grid-template-columns: 1fr;
    }

    .modal-body {
        padding: var(--spacing-md);
    }

    .modal-header {
        padding: var(--spacing-md);
    }

    .modal-footer {
        padding: var(--spacing-md);
    }
}