/* ==========================================================================
   AI DOCX Academic Editor — Ultra-Premium Design System (CSS Vanilla)
   ========================================================================== */

:root {
    /* HSL Color Tokens — Dark Modern Sleek Theme */
    --bg-main: hsl(222, 47%, 7%);
    --bg-card: hsla(222, 40%, 13%, 0.75);
    --bg-card-hover: hsla(222, 40%, 17%, 0.85);
    --border-glass: hsla(222, 30%, 30%, 0.35);
    
    --primary: hsl(238, 85%, 65%);
    --primary-glow: hsla(238, 85%, 65%, 0.3);
    --primary-hover: hsl(238, 85%, 72%);
    
    --accent: hsl(190, 90%, 55%);
    --success: hsl(152, 70%, 48%);
    --warning: hsl(38, 92%, 58%);
    --danger: hsl(352, 80%, 58%);
    
    --text-main: hsl(210, 30%, 96%);
    --text-muted: hsl(215, 20%, 65%);
    --text-dim: hsl(215, 15%, 45%);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing & Layout */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
    --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background: var(--bg-main);
    background-image: 
        radial-gradient(at 10% 20%, hsla(238, 85%, 65%, 0.12) 0px, transparent 50%),
        radial-gradient(at 90% 80%, hsla(190, 90%, 55%, 0.08) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Glassmorphism Classes */
.glass-header {
    background: hsla(222, 45%, 9%, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glass);
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glass);
}

/* Header Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    height: 72px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 1.8rem;
    filter: drop-shadow(0 0 8px var(--primary-glow));
}

.brand-text h1 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-status {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Health Badge */
.health-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    background: hsla(220, 20%, 20%, 0.6);
    border: 1px solid var(--border-glass);
}

.health-badge.status-online {
    background: hsla(152, 70%, 48%, 0.15);
    border-color: hsla(152, 70%, 48%, 0.4);
    color: var(--success);
}

.health-badge.status-offline {
    background: hsla(352, 80%, 58%, 0.15);
    border-color: hsla(352, 80%, 58%, 0.4);
    color: var(--danger);
}

.health-badge.status-checking {
    color: var(--warning);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 8px currentColor;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.8; }
}

/* Buttons & Badges */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    outline: none;
}

.btn-icon {
    background: hsla(222, 30%, 25%, 0.5);
    color: var(--text-main);
    border: 1px solid var(--border-glass);
}

.btn-icon:hover {
    background: hsla(222, 30%, 35%, 0.6);
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
    background: hsla(222, 30%, 25%, 0.6);
    color: var(--text-main);
    border: 1px solid var(--border-glass);
}

.btn-success {
    background: var(--success);
    color: #000;
    font-weight: 700;
    box-shadow: 0 4px 15px hsla(152, 70%, 48%, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px hsla(152, 70%, 48%, 0.45);
}

.btn-danger {
    background: hsla(352, 80%, 58%, 0.15);
    color: var(--danger);
    border: 1px solid hsla(352, 80%, 58%, 0.4);
}

.btn-danger:hover {
    background: var(--danger);
    color: #fff;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.badge {
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-version {
    background: hsla(190, 90%, 55%, 0.15);
    color: var(--accent);
    border: 1px solid hsla(190, 90%, 55%, 0.3);
}

.badge-neutral {
    background: hsla(220, 20%, 30%, 0.5);
    color: var(--text-muted);
}

/* Workspace Layout Grid */
.workspace-grid {
    display: grid;
    grid-template-columns: 320px 1fr 380px;
    gap: 1.5rem;
    padding: 1.5rem 2rem;
    flex: 1;
    height: calc(100vh - 72px);
}

.panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.panel-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: hsla(222, 40%, 15%, 0.4);
}

.panel-header h2 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
}

/* Left Panel: Upload Box & Outline */
.upload-box {
    padding: 1.25rem;
}

.upload-trigger {
    border: 2px dashed var(--border-glass);
    border-radius: var(--radius-md);
    padding: 1.75rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: hsla(222, 40%, 11%, 0.5);
}

.upload-trigger:hover, .upload-trigger.drag-over {
    border-color: var(--primary);
    background: hsla(238, 85%, 65%, 0.08);
}

.upload-icon {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

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

.browse-link {
    color: var(--accent);
    text-decoration: underline;
    font-weight: 500;
}

.upload-meta {
    font-size: 0.72rem;
    color: var(--text-dim);
    margin-top: 0.6rem;
}

.doc-summary-card {
    margin: 0 1.25rem 1rem;
    padding: 0.85rem 1rem;
    background: hsla(222, 40%, 18%, 0.6);
    border: 1px solid var(--primary-glow);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.doc-info {
    flex: 1;
    overflow: hidden;
}

.doc-info h4 {
    font-size: 0.88rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.divider {
    border: 0;
    height: 1px;
    background: var(--border-glass);
    margin: 0.5rem 0;
}

.outline-section {
    padding: 1rem 1.25rem;
    flex: 1;
    overflow-y: auto;
}

.outline-section h3 {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.outline-tree {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.outline-item {
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    background: hsla(222, 30%, 16%, 0.4);
    border-left: 3px solid var(--border-glass);
    font-size: 0.84rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.outline-item:hover {
    background: hsla(222, 30%, 22%, 0.6);
    border-left-color: var(--primary);
}

.outline-item .para-count {
    font-size: 0.72rem;
    background: hsla(222, 40%, 25%, 0.8);
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    color: var(--text-muted);
}

/* Center Panel: Chat Box */
.chat-messages {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.message {
    display: flex;
    gap: 1rem;
    max-width: 88%;
}

.message.user-msg {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.msg-avatar {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: hsla(222, 40%, 20%, 0.8);
    border: 1px solid var(--border-glass);
    flex-shrink: 0;
}

.user-msg .msg-avatar {
    background: var(--primary);
}

.msg-content {
    background: hsla(222, 35%, 15%, 0.7);
    border: 1px solid var(--border-glass);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.92rem;
    line-height: 1.55;
}

.user-msg .msg-content {
    background: hsla(238, 85%, 65%, 0.18);
    border-color: hsla(238, 85%, 65%, 0.4);
}

.msg-content h4 {
    font-family: var(--font-heading);
    margin-bottom: 0.4rem;
    color: var(--accent);
}

.msg-content p {
    margin-bottom: 0.6rem;
}

.msg-content p:last-child {
    margin-bottom: 0;
}

.msg-content code {
    background: hsla(222, 40%, 10%, 0.8);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.84em;
    color: var(--accent);
}

/* Chat Input Controls */
.chat-input-area {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-glass);
    background: hsla(222, 40%, 12%, 0.6);
}

.scope-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.select-input {
    background: hsla(222, 40%, 16%, 0.9);
    color: var(--text-main);
    border: 1px solid var(--border-glass);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    outline: none;
}

.scope-select {
    flex: 1;
}

.chat-form {
    display: flex;
    gap: 0.75rem;
}

.chat-form textarea {
    flex: 1;
    background: hsla(222, 45%, 9%, 0.8);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 0.8rem 1rem;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.92rem;
    resize: none;
    outline: none;
    transition: var(--transition);
}

.chat-form textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.btn-send {
    padding: 0 1.5rem;
    border-radius: var(--radius-md);
    background: var(--primary);
    color: #fff;
    font-size: 1.1rem;
}

/* Right Panel: Proposal Review & Verification */
.proposal-container {
    flex: 1;
    padding: 1.25rem;
    overflow-y: auto;
}

.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--text-muted);
}

.shield-icon {
    font-size: 3rem;
    margin-bottom: 0.75rem;
    opacity: 0.7;
}

.proposal-card {
    background: hsla(222, 35%, 16%, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
}

.proposal-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.op-type-badge {
    background: hsla(190, 90%, 55%, 0.15);
    color: var(--accent);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
}

.diff-box {
    border-radius: var(--radius-sm);
    overflow: hidden;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    border: 1px solid var(--border-glass);
}

.diff-old {
    background: hsla(352, 80%, 58%, 0.12);
    color: hsl(352, 80%, 75%);
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid hsla(352, 80%, 58%, 0.2);
}

.diff-new {
    background: hsla(152, 70%, 48%, 0.12);
    color: hsl(152, 70%, 75%);
    padding: 0.6rem 0.8rem;
}

/* Verification L1-L5 Checks Footer */
.proposal-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-glass);
    background: hsla(222, 40%, 11%, 0.7);
}

.verification-checks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--success);
    background: hsla(152, 70%, 48%, 0.1);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    border: 1px solid hsla(152, 70%, 48%, 0.25);
}

.check-icon {
    font-weight: 800;
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
}

/* Download Card */
.download-card {
    margin: 1.25rem;
    padding: 1.5rem;
    background: hsla(152, 70%, 48%, 0.12);
    border: 1px solid hsla(152, 70%, 48%, 0.35);
    border-radius: var(--radius-md);
    text-align: center;
}

.success-banner {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 0.5rem;
}

.download-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.btn-download {
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
}

/* Modal Styling */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal-content {
    width: 100%;
    max-width: 460px;
    overflow: hidden;
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
}

.modal-body {
    padding: 1.5rem;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.4rem;
}

.input-group input {
    flex: 1;
    background: hsla(222, 45%, 9%, 0.9);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.85rem;
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
}

.helper-text {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
    line-height: 1.5;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-glass);
    display: flex;
    justify-content: flex-end;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 1px solid var(--border-glass);
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.toast-info { background: hsla(222, 40%, 18%, 0.95); color: var(--text-main); border-color: var(--primary); }
.toast.toast-success { background: hsla(152, 70%, 20%, 0.95); color: #fff; border-color: var(--success); }
.toast.toast-error { background: hsla(352, 80%, 25%, 0.95); color: #fff; border-color: var(--danger); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.hidden {
    display: none !important;
}

/* Progress bar */
.progress-container {
    margin-top: 1rem;
}

.progress-bar {
    height: 6px;
    background: hsla(222, 30%, 20%, 0.8);
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.3s ease;
}

.progress-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

/* Responsive adjustments */
@media (max-width: 1200px) {
    .workspace-grid {
        grid-template-columns: 280px 1fr;
    }
    .right-panel {
        grid-column: span 2;
    }
}

@media (max-width: 860px) {
    .workspace-grid {
        grid-template-columns: 1fr;
    }
}