@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&family=Outfit:wght@300;400;500;600&display=swap');

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

:root {
    /* Core palette */
    --ink: #0c1220;
    --ink-light: #162033;
    --ink-lighter: #1e2d47;
    --gold: #c8a45c;
    --gold-light: #e8d5a3;
    --gold-dim: rgba(200, 164, 92, 0.15);
    --parchment: #f8f6f1;
    --parchment-dark: #eee9df;
    --white: #ffffff;

    /* Text */
    --text-primary: #1a1a2e;
    --text-secondary: #6b6560;
    --text-muted: #9b9590;
    --text-on-dark: #e2e0dc;
    --text-on-dark-muted: #8b8a88;

    /* Functional */
    --border: #e5e1d8;
    --border-dark: #2a3a55;
    --success: #2d8659;
    --danger: #c44b4b;
    --info: #3b7dd8;

    /* Effects */
    --shadow-sm: 0 1px 3px rgba(12, 18, 32, 0.06);
    --shadow-md: 0 4px 12px rgba(12, 18, 32, 0.08);
    --shadow-lg: 0 8px 30px rgba(12, 18, 32, 0.12);
    --shadow-gold: 0 0 20px rgba(200, 164, 92, 0.15);

    /* Spacing */
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;

    /* Fonts */
    --font-serif: 'Noto Serif SC', 'Songti SC', serif;
    --font-sans: 'Outfit', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    /* Layout */
    --sidebar-width: 300px;
    --header-height: 64px;
}

/* ─── Base ─────────────────────────────────── */

body {
    font-family: var(--font-sans);
    background: var(--ink);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ─── App Shell ────────────────────────────── */

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

/* ─── Header ───────────────────────────────── */

.app-header {
    height: var(--header-height);
    background: linear-gradient(135deg, var(--ink) 0%, var(--ink-light) 100%);
    border-bottom: 1px solid var(--border-dark);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    flex-shrink: 0;
    position: relative;
    z-index: 10;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--shadow-gold);
}

.brand-text h1 {
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 700;
    color: var(--text-on-dark);
    letter-spacing: 2px;
}

.brand-text .subtitle {
    font-size: 11px;
    color: var(--text-on-dark-muted);
    letter-spacing: 1px;
    margin-top: 1px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-badge {
    padding: 4px 12px;
    background: var(--gold-dim);
    border: 1px solid rgba(200, 164, 92, 0.3);
    border-radius: 20px;
    font-size: 11px;
    color: var(--gold-light);
    letter-spacing: 0.5px;
}

.mobile-sidebar-toggle {
    display: none;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-on-dark-muted);
    font-size: 18px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

/* ─── Main Content ─────────────────────────── */

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ─── Chat Container ───────────────────────── */

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--parchment);
    position: relative;
}

/* Paper texture overlay */
.chat-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(200, 164, 92, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(200, 164, 92, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ─── Quick Actions ────────────────────────── */

.quick-actions {
    padding: 14px 28px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: relative;
    z-index: 1;
    animation: slideDown 0.4s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.quick-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.quick-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.quick-btn {
    padding: 7px 18px;
    border: 1px solid var(--border);
    border-radius: 24px;
    background: var(--white);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.quick-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    opacity: 0;
    transition: opacity 0.25s;
}

.quick-btn:hover {
    border-color: var(--gold);
    color: var(--ink);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.quick-btn:hover::before {
    opacity: 0.1;
}

.quick-btn.active {
    background: linear-gradient(135deg, var(--ink) 0%, var(--ink-light) 100%);
    color: var(--gold-light);
    border-color: var(--ink);
    box-shadow: var(--shadow-md);
}

/* ─── Chat Messages ────────────────────────── */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative;
    z-index: 1;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ─── Messages ─────────────────────────────── */

.message {
    display: flex;
    gap: 12px;
    max-width: 80%;
    animation: messageIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message-assistant {
    align-self: flex-start;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    flex-shrink: 0;
    font-weight: 600;
}

.message-assistant .message-avatar {
    background: linear-gradient(135deg, var(--ink) 0%, var(--ink-light) 100%);
    color: var(--gold);
    box-shadow: var(--shadow-sm);
}

.message-user .message-avatar {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    color: var(--ink);
    box-shadow: var(--shadow-sm);
}

.message-bubble {
    padding: 14px 18px;
    border-radius: var(--radius);
    line-height: 1.7;
    font-size: 14px;
    word-break: break-word;
}

.message-assistant .message-bubble {
    background: var(--white);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    border-top-left-radius: 4px;
}

.message-user .message-bubble {
    background: linear-gradient(135deg, var(--ink) 0%, var(--ink-light) 100%);
    color: var(--text-on-dark);
    box-shadow: var(--shadow-md);
    border-top-right-radius: 4px;
}

/* Markdown in messages */
.message-bubble h2,
.message-bubble h3 {
    font-family: var(--font-serif);
    color: var(--ink);
    margin: 16px 0 8px 0;
}

.message-bubble h2 { font-size: 16px; }
.message-bubble h3 { font-size: 15px; }

.message-bubble strong {
    color: var(--ink);
    font-weight: 600;
}

.message-user .message-bubble strong {
    color: var(--gold-light);
}

.message-bubble hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 14px 0;
}

.message-bubble ul,
.message-bubble ol {
    margin: 8px 0;
    padding-left: 20px;
}

.message-bubble li {
    margin: 4px 0;
}

.message-bubble code {
    background: var(--parchment);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

/* ─── Action Cards ─────────────────────────── */

.action-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
}

.action-card {
    padding: 9px 18px;
    border: 1px solid var(--gold);
    border-radius: var(--radius-sm);
    background: var(--gold-dim);
    color: var(--ink);
    font-size: 13px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    font-weight: 500;
}

.action-card:hover {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    color: var(--ink);
    transform: translateY(-1px);
    box-shadow: var(--shadow-gold);
}

/* ─── Loading ──────────────────────────────── */

.loading-indicator {
    text-align: center;
    color: var(--text-muted);
    padding: 60px 40px;
    animation: fadeIn 0.6s ease;
}

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

.loading-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    border: 3px solid var(--border);
    border-top-color: var(--gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-indicator p {
    font-size: 14px;
    color: var(--text-muted);
}

/* Typing indicator */
.typing-dots {
    display: inline-flex;
    gap: 5px;
    padding: 12px 18px;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.typing-dots span {
    width: 7px;
    height: 7px;
    background: var(--gold);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typingBounce {
    0%, 80%, 100% {
        transform: scale(0.4);
        opacity: 0.4;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* ─── Chat Input ───────────────────────────── */

.chat-input-area {
    padding: 16px 28px 20px;
    background: var(--white);
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.input-wrapper {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    background: var(--parchment);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 6px 6px 16px;
    transition: border-color 0.25s, box-shadow 0.25s;
}

.input-wrapper:focus-within {
    border-color: var(--gold);
    box-shadow: 0 0 0 3px var(--gold-dim);
}

.input-wrapper textarea {
    flex: 1;
    padding: 8px 0;
    border: none;
    background: transparent;
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--text-primary);
    resize: none;
    max-height: 120px;
    outline: none;
    line-height: 1.5;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.input-wrapper button {
    padding: 10px 22px;
    background: linear-gradient(135deg, var(--ink) 0%, var(--ink-light) 100%);
    color: var(--gold-light);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s;
    white-space: nowrap;
    letter-spacing: 0.5px;
}

.input-wrapper button:hover:not(:disabled) {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.input-wrapper button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.disclaimer {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 10px;
    text-align: center;
    letter-spacing: 0.3px;
}

/* ─── Sidebar ──────────────────────────────── */

.sidebar {
    width: var(--sidebar-width);
    background: var(--ink);
    border-left: 1px solid var(--border-dark);
    overflow-y: auto;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-dark);
    border-radius: 2px;
}

.sidebar-section h3 {
    font-family: var(--font-serif);
    font-size: 13px;
    font-weight: 600;
    color: var(--gold);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-dark);
    position: relative;
}

.sidebar-section h3::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--gold);
}

.case-info-panel,
.docs-panel {
    font-size: 13px;
    color: var(--text-on-dark);
}

.placeholder-text {
    color: var(--text-on-dark-muted);
    font-size: 12px;
    font-style: italic;
    padding: 8px 0;
}

.case-info-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-dark);
    display: flex;
    gap: 10px;
    animation: fadeIn 0.3s ease;
}

.case-info-label {
    color: var(--text-on-dark-muted);
    min-width: 65px;
    flex-shrink: 0;
    font-size: 12px;
}

.case-info-value {
    color: var(--text-on-dark);
    word-break: break-all;
    font-size: 13px;
}

.doc-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--ink-light);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.25s;
    animation: fadeIn 0.3s ease;
}

.doc-item:hover {
    background: var(--ink-lighter);
    border-color: var(--gold);
    box-shadow: var(--shadow-gold);
}

.doc-item a {
    color: var(--gold-light);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
}

/* ─── Sidebar Nav ─────────────────────────── */

.sidebar-nav {
    display: flex;
    gap: 6px;
}

.sidebar-nav-btn {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-on-dark-muted);
    font-size: 12px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.25s;
}

.sidebar-nav-btn.active {
    background: var(--gold-dim);
    border-color: var(--gold);
    color: var(--gold-light);
}

.sidebar-nav-btn:hover:not(.active) {
    border-color: var(--text-on-dark-muted);
    color: var(--text-on-dark);
}

/* ─── Doc Tool Buttons ────────────────────── */

.doc-tool-buttons {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.doc-tool-btn {
    padding: 10px 14px;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    background: var(--ink-light);
    color: var(--text-on-dark);
    font-size: 13px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.25s;
    text-align: left;
}

.doc-tool-btn:hover {
    border-color: var(--gold);
    background: var(--ink-lighter);
    box-shadow: var(--shadow-gold);
}

.doc-tool-btn.active {
    border-color: var(--gold);
    background: var(--gold-dim);
    color: var(--gold-light);
}

/* ─── Document Form ───────────────────────── */

.doc-form-container {
    flex: 1;
    background: var(--parchment);
    overflow-y: auto;
    padding: 40px;
}

.doc-form-inner {
    max-width: 640px;
    margin: 0 auto;
}

.doc-form-header {
    margin-bottom: 32px;
}

.doc-form-header h2 {
    font-family: var(--font-serif);
    font-size: 24px;
    color: var(--ink);
    margin-bottom: 8px;
}

.doc-form-description {
    color: var(--text-secondary);
    font-size: 14px;
}

.doc-form-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.doc-form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.doc-form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.doc-form-group input,
.doc-form-group textarea {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--white);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--text-primary);
    transition: border-color 0.25s, box-shadow 0.25s;
}

.doc-form-group input:focus,
.doc-form-group textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 3px var(--gold-dim);
}

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

.doc-form-actions {
    margin-top: 24px;
}

.doc-form-submit {
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--ink) 0%, var(--ink-light) 100%);
    color: var(--gold-light);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s;
    letter-spacing: 0.5px;
}

.doc-form-submit:hover:not(:disabled) {
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.doc-form-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.doc-form-result {
    margin-top: 24px;
    padding: 20px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}

.doc-form-result a {
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    color: var(--ink);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.25s;
}

.doc-form-result a:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-gold);
}

/* ─── Responsive ───────────────────────────── */

@media (max-width: 900px) {
    :root {
        --sidebar-width: 280px;
    }

    .mobile-sidebar-toggle {
        display: flex;
    }

    .sidebar {
        position: fixed;
        top: var(--header-height);
        right: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(100%);
        box-shadow: -8px 0 30px rgba(0, 0, 0, 0.3);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        top: var(--header-height);
        background: rgba(0, 0, 0, 0.4);
        z-index: 99;
    }

    .sidebar-overlay.open {
        display: block;
    }

    .message {
        max-width: 92%;
    }

    .header-badge {
        display: none;
    }
}

@media (max-width: 640px) {
    .doc-form-container {
        padding: 20px 16px;
    }
    .doc-form-fields {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: 0 16px;
    }

    .brand-text h1 {
        font-size: 16px;
    }

    .quick-actions {
        padding: 10px 16px;
    }

    .chat-messages {
        padding: 16px;
    }

    .chat-input-area {
        padding: 12px 16px 16px;
    }

    .quick-btn {
        font-size: 12px;
        padding: 5px 12px;
    }
}