/* Material Design 3 Color System */
:root {
    --md-sys-primary: #1976D2;
    --md-sys-on-primary: #FFFFFF;
    --md-sys-primary-container: #BBDEFB;
    --md-sys-on-primary-container: #004BA0;
    
    --md-sys-secondary: #00796B;
    --md-sys-on-secondary: #FFFFFF;
    --md-sys-secondary-container: #B2DFDB;
    
    --md-sys-tertiary: #7B1FA2;
    --md-sys-error: #D32F2F;
    --md-sys-success: #388E3C;
    --md-sys-warning: #F57C00;
    
    --md-sys-background: #FAFAFA;
    --md-sys-surface: #FFFFFF;
    --md-sys-surface-variant: #F5F5F5;
    --md-sys-surface-container: #F0F0F0;
    
    --md-sys-on-background: #1C1B1F;
    --md-sys-on-surface: #1C1B1F;
    --md-sys-on-surface-variant: #49454F;
    --md-sys-outline: #E0E0E0;
    --md-sys-outline-variant: #CAC4D0;
    
    --md-sys-shadow: #000000;
    --md-sys-scrim: #000000;
    
    /* Elevation Shadows */
    --md-elevation-1: 0 1px 2px 0 rgba(0,0,0,0.05);
    --md-elevation-2: 0 2px 6px 0 rgba(0,0,0,0.08);
    --md-elevation-3: 0 4px 12px 0 rgba(0,0,0,0.10);
    --md-elevation-4: 0 6px 16px 0 rgba(0,0,0,0.12);
    --md-elevation-5: 0 8px 20px 0 rgba(0,0,0,0.14);
    
    /* Spacing System */
    --spacing-xxs: 2px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    
    /* Border Radius */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 1000px;
    
    /* Typography Scale */
    --text-xs: 10px;
    --text-sm: 11px;
    --text-base: 12px;
    --text-md: 13px;
    --text-lg: 14px;
    --text-xl: 16px;
    --text-2xl: 18px;
}

/* Global Reset - Mobile First */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 14px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    font-size: var(--text-base);
    line-height: 1.4;
    color: var(--md-sys-on-background);
    background: var(--md-sys-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior: contain;
    min-height: 100vh;
    touch-action: pan-y;
}

/* RTL/LTR Support */
[dir="rtl"] {
    direction: rtl;
    text-align: right;
}

[dir="ltr"] {
    direction: ltr;
    text-align: left;
}

/* Material App Bar */
.header {
    background: var(--md-sys-surface);
    height: 48px;
    padding: 0 var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: var(--md-elevation-1);
    transition: box-shadow 0.2s;
}

.header-title {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--md-sys-on-surface);
    letter-spacing: 0.1px;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 var(--spacing-sm);
}

/* Navigation Icon */
.nav-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--md-sys-on-surface-variant);
    transition: background 0.2s;
    text-decoration: none;
    font-size: 18px;
    background: transparent;
    border: none;
}

.nav-icon:active {
    background: var(--md-sys-surface-variant);
}

/* User Avatar Chip */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    height: 32px;
    padding: 0 var(--spacing-xs);
    border-radius: var(--radius-full);
    background: var(--md-sys-surface-variant);
}

.user-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: var(--text-sm);
    color: var(--md-sys-on-surface-variant);
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: none;
}

/* Icon Button - Logout */
.logout-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s;
    color: var(--md-sys-on-surface-variant);
    font-size: var(--text-xs);
    font-weight: 500;
    text-decoration: none;
}

.logout-btn::before {
    content: "⎋";
    font-size: 16px;
}

[dir="rtl"] .logout-btn::before {
    content: "⎋";
}

[dir="ltr"] .logout-btn::before {
    content: "⎋";
}

.logout-btn:active {
    background: rgba(0,0,0,0.08);
}

/* Hide logout text on mobile */
.logout-btn span {
    display: none;
}

/* Container */
.container {
    padding: var(--spacing-sm);
    padding-bottom: 60px;
    max-width: 100vw;
    overflow-x: hidden;
}

/* Material Search Bar */
.search-bar {
    margin-bottom: var(--spacing-sm);
}

.search-input {
    width: 100%;
    height: 40px;
    padding: 0 var(--spacing-lg) 0 36px;
    border: 1px solid var(--md-sys-outline);
    border-radius: var(--radius-full);
    background: var(--md-sys-surface);
    font-size: var(--text-base);
    color: var(--md-sys-on-surface);
    transition: all 0.2s;
    position: relative;
    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='%2349454F' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cpath d='m21 21-4.35-4.35'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 12px center;
    background-size: 16px;
}

[dir="rtl"] .search-input {
    padding: 0 36px 0 var(--spacing-lg);
    background-position: calc(100% - 12px) center;
}

.search-input:focus {
    outline: none;
    border-color: var(--md-sys-primary);
    box-shadow: 0 0 0 1px var(--md-sys-primary);
}

.search-input::placeholder {
    color: var(--md-sys-on-surface-variant);
    font-size: var(--text-sm);
}

/* Material Cards - Ultra Compact */
.card {
    background: var(--md-sys-surface);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border: 1px solid var(--md-sys-outline);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
    position: relative;
    overflow: hidden;
    max-height: 56px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--md-sys-primary);
    opacity: 0;
    transition: opacity 0.2s;
}

.card:active::before {
    opacity: 0.08;
}

.card-title {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--md-sys-on-surface);
    line-height: 1.2;
    margin-bottom: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-description {
    font-size: var(--text-xs);
    color: var(--md-sys-on-surface-variant);
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.card-meta {
    font-size: var(--text-xs);
    color: var(--md-sys-on-surface-variant);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-top: 2px;
}

.card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

/* Response Card - Compact */
.response-card {
    background: var(--md-sys-surface);
    border: 1px solid var(--md-sys-outline);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    position: relative;
    transition: all 0.2s;
}

.response-card:active {
    background: var(--md-sys-surface-variant);
}

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

.response-title {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--md-sys-on-surface);
    line-height: 1.2;
    flex: 1;
}

.response-subtitle {
    font-size: var(--text-xs);
    color: var(--md-sys-on-surface-variant);
    line-height: 1.2;
    margin-top: 2px;
}

.response-actions {
    display: flex;
    gap: var(--spacing-xxs);
}

.action-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.action-icon:active {
    background: rgba(0,0,0,0.08);
}

.action-icon.active {
    color: var(--md-sys-warning);
}

/* Quick Actions Bar */
.quick-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--md-sys-outline);
}

.quick-action-btn {
    height: 28px;
    padding: 0 var(--spacing-sm);
    border: 1px solid var(--md-sys-outline);
    border-radius: var(--radius-full);
    background: var(--md-sys-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    font-size: var(--text-xs);
    color: var(--md-sys-on-surface-variant);
    text-decoration: none;
    transition: all 0.2s;
    flex: 1;
    max-width: 60px;
}

.quick-action-btn:active {
    background: var(--md-sys-primary-container);
    border-color: var(--md-sys-primary);
}

.quick-action-btn.disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

/* Only show icons on quick actions */
.quick-action-btn span {
    display: none;
}

/* Material Tabs */
.tabs {
    display: flex;
    gap: var(--spacing-xxs);
    margin-bottom: var(--spacing-sm);
    background: var(--md-sys-surface-variant);
    padding: var(--spacing-xxs);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    flex: 1;
    height: 32px;
    padding: 0 var(--spacing-md);
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--md-sys-on-surface-variant);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab:active {
    transform: scale(0.98);
}

.tab.active {
    background: var(--md-sys-primary);
    color: var(--md-sys-on-primary);
}

/* Filter Panel - Compact */
.filter-panel {
    background: var(--md-sys-surface);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--md-sys-outline);
}

.filter-row {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.filter-row:last-child {
    margin-bottom: 0;
}

/* Form Elements */
.form-select {
    height: 36px;
    width: 100%;
    padding: 0 32px 0 var(--spacing-md);
    border: 1px solid var(--md-sys-outline);
    border-radius: var(--radius-xs);
    background: var(--md-sys-surface);
    font-size: var(--text-sm);
    color: var(--md-sys-on-surface);
    appearance: none;
    cursor: pointer;
    transition: all 0.2s;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2349454F' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 10px) center;
    background-size: 12px;
}

[dir="rtl"] .form-select {
    padding: 0 var(--spacing-md) 0 32px;
    background-position: 10px center;
}

.form-select:focus {
    outline: none;
    border-color: var(--md-sys-primary);
}

/* Material Buttons */
.btn {
    height: 36px;
    padding: 0 var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    letter-spacing: 0.1px;
    text-transform: uppercase;
    min-width: 64px;
}

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

.btn-primary {
    background: var(--md-sys-primary);
    color: var(--md-sys-on-primary);
    box-shadow: var(--md-elevation-1);
}

.btn-primary:hover {
    box-shadow: var(--md-elevation-2);
}

.btn-secondary {
    background: transparent;
    color: var(--md-sys-primary);
    border: 1px solid var(--md-sys-outline);
}

.btn-secondary:hover {
    background: var(--md-sys-surface-variant);
}

/* Floating Action Button */
.lang-toggle {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--md-sys-primary);
    color: var(--md-sys-on-primary);
    border: none;
    box-shadow: var(--md-elevation-3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 700;
    z-index: 100;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

[dir="rtl"] .lang-toggle {
    left: var(--spacing-lg);
    right: auto;
}

.lang-toggle:active {
    transform: scale(0.9);
    box-shadow: var(--md-elevation-2);
}

/* Login Screen - Material Design */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: var(--md-sys-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl);
    width: 100%;
    max-width: 320px;
    box-shadow: var(--md-elevation-4);
    text-align: center;
}

.login-title {
    font-size: var(--text-2xl);
    font-weight: 500;
    color: var(--md-sys-primary);
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    font-size: var(--text-sm);
    color: var(--md-sys-on-surface-variant);
    margin-bottom: var(--spacing-xl);
    line-height: 1.4;
}

.google-signin-btn {
    width: 100%;
    height: 40px;
    border: 1px solid var(--md-sys-outline);
    border-radius: var(--radius-full);
    background: var(--md-sys-surface);
    color: var(--md-sys-on-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
}

.google-signin-btn:active {
    background: var(--md-sys-surface-variant);
}

.google-icon {
    width: 18px;
    height: 18px;
}

/* Modal - Material Bottom Sheet Style */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.32);
    display: none;
    z-index: 200;
    align-items: flex-end;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--md-sys-surface);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-height: 85vh;
    padding: var(--spacing-lg);
    overflow-y: auto;
    animation: slideUp 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

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

.modal-title {
    font-size: var(--text-xl);
    font-weight: 500;
    color: var(--md-sys-on-surface);
}

.close-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--md-sys-on-surface-variant);
    font-size: 20px;
    transition: background 0.2s;
}

.close-btn:active {
    background: var(--md-sys-surface-variant);
}

/* Form Groups */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--md-sys-on-surface-variant);
    margin-bottom: var(--spacing-xs);
    display: block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Loading State */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    color: var(--md-sys-on-surface-variant);
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--md-sys-surface-variant);
    border-top-color: var(--md-sys-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--md-sys-on-surface-variant);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: var(--text-base);
    line-height: 1.5;
}

/* Group View */
.group-container {
    margin-bottom: var(--spacing-md);
}

.group-header {
    background: var(--md-sys-primary-container);
    color: var(--md-sys-on-primary-container);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-sm);
    font-weight: 500;
}

.group-title {
    flex: 1;
}

.group-count {
    background: var(--md-sys-primary);
    color: var(--md-sys-on-primary);
    padding: 2px var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 500;
    min-width: 20px;
    text-align: center;
}

/* Ripple Effect */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(0,0,0,0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.ripple:active::after {
    width: 300px;
    height: 300px;
}

/* Tablet Optimizations */
@media (min-width: 600px) {
    .container {
        max-width: 600px;
        margin: 0 auto;
        padding: var(--spacing-md);
    }
    
    .card {
        max-height: 64px;
        padding: var(--spacing-md);
    }
    
    .card-description {
        max-width: 80%;
    }
    
    .tabs {
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .modal-content {
        max-width: 500px;
        margin: 0 auto;
        border-radius: var(--radius-lg);
    }
    
    .filter-row {
        gap: var(--spacing-sm);
    }
    
    .user-name {
        display: block;
    }
    
    .header {
        padding: 0 var(--spacing-md);
        height: 56px;
    }
    
    .header-title {
        font-size: var(--text-xl);
    }
}

/* Desktop Optimizations */
@media (min-width: 1024px) {
    .container {
        max-width: 720px;
        padding: var(--spacing-lg);
    }
    
    .modal {
        align-items: center;
        background: rgba(0,0,0,0.5);
    }
    
    .modal-content {
        animation: fadeIn 0.2s ease-out;
        max-height: 80vh;
    }
    
    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: scale(0.95);
        }
        to {
            opacity: 1;
            transform: scale(1);
        }
    }
    
    /* Show some text on desktop */
    .logout-btn {
        width: auto;
        padding: 0 var(--spacing-md);
        border-radius: var(--radius-full);
    }
    
    .logout-btn::before {
        content: none;
    }
    
    .logout-btn span {
        display: inline;
    }
    
    .quick-action-btn {
        max-width: none;
        width: auto;
    }
    
    .quick-action-btn span {
        display: inline;
        margin-left: var(--spacing-xs);
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --md-sys-primary: #90CAF9;
        --md-sys-on-primary: #003258;
        --md-sys-primary-container: #004A77;
        --md-sys-on-primary-container: #D1E4FF;
        
        --md-sys-background: #1C1B1F;
        --md-sys-surface: #2B2930;
        --md-sys-surface-variant: #3B383F;
        --md-sys-surface-container: #201F24;
        
        --md-sys-on-background: #E6E1E5;
        --md-sys-on-surface: #E6E1E5;
        --md-sys-on-surface-variant: #CAC4D0;
        --md-sys-outline: #49454F;
        --md-sys-outline-variant: #79747E;
    }
    
    .login-container {
        background: linear-gradient(135deg, #1a237e 0%, #311b92 100%);
    }
    
    .google-signin-btn {
        background: #2B2930;
        border-color: #49454F;
        color: #E6E1E5;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus Visible for Keyboard Navigation */
*:focus-visible {
    outline: 2px solid var(--md-sys-primary);
    outline-offset: 2px;
}

/* Safe Area Support */
@supports (padding: max(0px)) {
    body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }
    
    .lang-toggle {
        bottom: calc(var(--spacing-lg) + env(safe-area-inset-bottom));
    }
}

/* Print Styles */
@media print {
    .header,
    .lang-toggle,
    .tabs,
    .filter-panel,
    .quick-actions,
    .action-icon {
        display: none !important;
    }
    
    .card,
    .response-card {
        break-inside: avoid;
        border: 1px solid #000;
        margin-bottom: 10px;
    }
    
    body {
        background: white;
        color: black;
    }
}