:root {
    --sage-50: #f8faf9;
    --sage-100: #f1f4f3;
    --sage-200: #e4e9e7;
    --sage-300: #d1d9d5;
    --sage-400: #a8b8b1;
    --sage-500: #879a90;
    --sage-600: #6a7f74;
    --sage-700: #57685f;
    --sage-800: #48544d;
    --sage-900: #3e4742;
    --sage-950: #252c28;

    --primary: var(--sage-600);
    --primary-hover: var(--sage-700);
    --text-primary: var(--sage-900);
    --text-secondary: var(--sage-700);
    --bg-primary: var(--sage-50);
    --bg-secondary: var(--sage-100);
    --bg-tertiary: var(--sage-200);
    --shadow-color: rgba(106, 127, 116, 0.08);
    --card-bg: #ffffff;
    --border-radius: 1rem;
    --border-radius-lg: 1.5rem;
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --header-height: 64px;
    --input-height: 56px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    animation: fadeInUp 0.6s ease;
}

.loading-logo {
    font-family: 'Impact', sans-serif;
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 2rem;
    letter-spacing: 2px;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--bg-tertiary);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-normal);
}

.app-container.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Header */
.app-header {
    height: var(--header-height);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition-fast);
}

.header-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.header-btn:hover {
    background: var(--bg-secondary);
    transform: scale(1.05);
}

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

.logo {
    font-family: 'Impact', sans-serif;
    font-size: 1.75rem;
    color: var(--primary);
    letter-spacing: 1px;
    font-weight: normal;
}

/* Subheader */
.subheader {
    background: var(--card-bg);
    border-bottom: 1px solid var(--bg-tertiary);
    position: sticky;
    top: var(--header-height);
    z-index: 90;
}

.categories-scroll {
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.categories-scroll::-webkit-scrollbar {
    display: none;
}

.categories {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    min-width: max-content;
}

.category {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}

.category:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.category.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(106, 127, 116, 0.2);
}

.category i {
    font-size: 0.8rem;
}

/* Main Content */
.app-main {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-primary);
}

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

/* Comment Cards */
.comment-card {
    background: var(--card-bg);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
    transition: var(--transition-fast);
    animation: slideInUp 0.4s ease;
    position: relative;
}

.comment-card:hover {
    border-color: var(--sage-400);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.comment-card:last-child {
    margin-bottom: 0;
}

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

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--sage-400), var(--sage-600));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.username {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

.timestamp {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.category-tag {
    padding: 0.3rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    flex-shrink: 0;
}

.comment-content {
    margin-bottom: 1rem;
    position: relative;
}

.comment-text {
    line-height: 1.6;
    word-wrap: break-word;
    white-space: pre-wrap;
    font-size: 0.95rem;
}

.comment-text.blurred {
    filter: blur(8px);
    user-select: none;
    pointer-events: none;
}

.sensitive-warning {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--bg-tertiary);
    z-index: 2;
}

.sensitive-warning i {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: block;
}

.sensitive-warning span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.comment-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.action-btn:hover:not(:disabled) {
    background: var(--bg-secondary);
    color: var(--primary);
    transform: translateY(-1px);
}

.action-btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.action-btn.liked {
    color: #ef4444;
}

.action-btn.liked i {
    animation: heartBeat 0.4s ease;
}

@keyframes heartBeat {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* Input Container */
.input-container {
    background: var(--card-bg);
    border-top: 1px solid var(--bg-tertiary);
    padding: 1rem;
    position: sticky;
    bottom: 0;
    z-index: 80;
}

.input-wrapper {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

.comment-input {
    flex: 1;
    min-height: 48px;
    max-height: 120px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    resize: none;
    transition: var(--transition-fast);
    line-height: 1.5;
}

.comment-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(106, 127, 116, 0.1);
}

.comment-input:disabled {
    background: var(--bg-secondary);
    cursor: not-allowed;
}

.input-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-shrink: 0;
}

.category-select {
    height: 48px;
    padding: 0 1rem;
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    min-width: 120px;
}

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

.send-btn {
    width: 48px;
    height: 48px;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.send-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.send-btn:disabled {
    background: var(--sage-400);
    cursor: not-allowed;
    transform: none;
}

.char-counter {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    height: 1rem;
}

/* Bottom Sheet */
.bottom-sheet {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    visibility: hidden;
}

.bottom-sheet.active {
    visibility: visible;
}

.sheet-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.bottom-sheet.active .sheet-overlay {
    opacity: 1;
}

.sheet-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    padding: 1.5rem;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    max-height: 80vh;
    overflow-y: auto;
}

.bottom-sheet.active .sheet-content {
    transform: translateY(0);
}

.sheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--bg-tertiary);
}

.sheet-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-sheet {
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.close-sheet:hover {
    background: var(--bg-secondary);
}

.sheet-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sheet-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: none;
    background: transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: left;
    width: 100%;
}

.sheet-option:hover {
    background: var(--bg-secondary);
}

.option-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.option-content {
    flex: 1;
    min-width: 0;
}

.option-text {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.option-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.option-arrow {
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* Banner */
.banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--primary);
    color: white;
    z-index: 10000;
    transform: translateY(-100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.banner.active {
    transform: translateY(0);
}

.banner-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.banner-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.banner-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.banner-text strong {
    font-weight: 600;
    font-size: 0.95rem;
}

.banner-text span {
    font-size: 0.85rem;
    opacity: 0.9;
}

.banner-actions {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.banner-btn {
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.banner-btn.secondary {
    background: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.banner-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

/* Security Notice */
.security-notice {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    z-index: 100000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.security-notice.active {
    display: flex;
}

.security-content {
    text-align: center;
    max-width: 400px;
    animation: fadeInUp 0.6s ease;
}

.security-icon {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.security-title {
    font-family: 'Impact', sans-serif;
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

.security-message {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.security-btn {
    padding: 0.75rem 2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.security-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(106, 127, 116, 0.3);
}

/* Toast Container */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 400px;
    width: calc(100% - 2rem);
}

.toast {
    background: var(--card-bg);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transform: translateX(400px);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.toast.active {
    transform: translateX(0);
}

.toast::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
}

.toast.success::before {
    background: #10b981;
}

.toast.error::before {
    background: #ef4444;
}

.toast.warning::before {
    background: #f59e0b;
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast.success .toast-icon {
    color: #10b981;
}

.toast.error .toast-icon {
    color: #ef4444;
}

.toast.warning .toast-icon {
    color: #f59e0b;
}

.toast-message {
    flex: 1;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeletonLoading 1.5s infinite;
    border-radius: 4px;
}

@keyframes skeletonLoading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-comment {
    background: var(--card-bg);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.skeleton-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton-user {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skeleton-text {
    height: 0.875rem;
}

.skeleton-text.short {
    width: 60%;
}

.skeleton-text.medium {
    width: 80%;
}

.skeleton-text.long {
    width: 100%;
}

.skeleton-tag {
    width: 80px;
    height: 24px;
    border-radius: 12px;
}

.skeleton-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.skeleton-actions {
    display: flex;
    gap: 1rem;
}

.skeleton-action {
    width: 60px;
    height: 32px;
    border-radius: var(--border-radius);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.95rem;
    max-width: 300px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        padding: 0 0.75rem;
    }
    
    .categories {
        padding: 0.75rem 0.75rem;
    }
    
    .app-main {
        padding: 0.75rem;
    }
    
    .comment-card {
        padding: 1rem;
        margin-bottom: 0.75rem;
    }
    
    .input-container {
        padding: 0.75rem;
    }
    
    .input-wrapper {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .input-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .category-select {
        flex: 1;
        min-width: auto;
    }
    
    .banner-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .banner-actions {
        width: 100%;
        justify-content: center;
    }
    
    .banner-btn {
        flex: 1;
        justify-content: center;
        max-width: 160px;
    }
    
    .sheet-content {
        padding: 1.25rem;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
        max-width: none;
    }
}

@media (max-width: 480px) {
    :root {
        --header-height: 56px;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .category {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .category i {
        display: none;
    }
    
    .comment-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .category-tag {
        align-self: flex-start;
    }
    
    .comment-actions {
        justify-content: space-between;
    }
    
    .action-btn span {
        display: none;
    }
    
    .action-btn {
        padding: 0.5rem;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .comment-card {
        border: 2px solid var(--sage-300);
    }
    
    .action-btn:hover {
        background: var(--sage-200);
        border: 1px solid var(--sage-400);
    }
    
    .category {
        border: 1px solid var(--sage-300);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .loading-spinner {
        animation: none;
    }
}

/* Focus Management */
button:focus-visible,
.category:focus-visible,
.comment-input:focus-visible,
.category-select:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .input-container,
    .banner,
    .bottom-sheet,
    .toast-container {
        display: none !important;
    }
    
    .app-header {
        position: static;
        border: none;
    }
    
    .comment-card {
        break-inside: avoid;
        border: 1px solid #ccc;
        box-shadow: none;
    }
}