/* ============================================================
   NEXUS RAG — Quantum Dark Design System
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,300;0,14..32,400;0,14..32,500;0,14..32,600;0,14..32,700;1,14..32,400&family=JetBrains+Mono:wght@400;500;600&family=Syne:wght@700;800&display=swap');

/* ── Design Tokens ── */
:root {
    --bg-void: #07080d;
    --bg-surface: #0d0f1a;
    --bg-elevated: #111320;
    --bg-hover: #161929;

    --blue-core: #2563eb;
    --blue-glow: #3b82f6;
    --blue-dim: rgba(37, 99, 235, 0.18);
    --blue-pulse: rgba(59, 130, 246, 0.35);

    --emerald: #10b981;
    --amber: #f59e0b;
    --red: #ef4444;

    --text-100: #f1f5f9;
    --text-300: #94a3b8;
    --text-500: #475569;

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-bright: rgba(255, 255, 255, 0.11);
    --border-accent: rgba(37, 99, 235, 0.4);

    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --shadow-panel: 0 24px 80px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--border-subtle);
    --shadow-blue: 0 0 30px rgba(37, 99, 235, 0.25), 0 0 80px rgba(37, 99, 235, 0.08);
    --shadow-msg: 0 4px 24px rgba(0, 0, 0, 0.4);

    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    height: 100%;
}

body {
    background-color: var(--bg-void);
    color: var(--text-100);
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ─────────────────────────────────────────
   ANIMATED BACKGROUND
───────────────────────────────────────── */
.scene-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: var(--bg-void);
    overflow: hidden;
}

/* Clean solid background — no animated blobs */
.scene-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg-void);
}

/* Subtle dot grid for texture */
.scene-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 28px 28px;
    opacity: 0.5;
}



/* ─────────────────────────────────────────
   APP SHELL
───────────────────────────────────────── */
.app-shell {
    position: relative;
    z-index: 1;
    max-width: 1520px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 16px;
    gap: 14px;
}

/* ─────────────────────────────────────────
   TOP BAR
───────────────────────────────────────── */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 60px;
    background: #0d0f1a;
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
    box-shadow: var(--shadow-panel);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    width: 34px;
    height: 34px;
    background: var(--blue-core);
    border-radius: 9px;
    display: grid;
    place-items: center;
    font-size: 16px;
    color: #fff;
    box-shadow: 0 0 0 3px var(--blue-dim), var(--shadow-blue);
    animation: icon-breathe 3s ease-in-out infinite;
}

@keyframes icon-breathe {

    0%,
    100% {
        box-shadow: 0 0 0 3px var(--blue-dim), 0 0 20px rgba(37, 99, 235, 0.3);
    }

    50% {
        box-shadow: 0 0 0 5px var(--blue-dim), 0 0 40px rgba(37, 99, 235, 0.5);
    }
}

.logo-text {
    font-family: 'Syne', sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-100);
}

.logo-text span {
    color: var(--blue-glow);
}

/* Topbar center pills */
.topbar-pills {
    display: flex;
    gap: 8px;
}

.pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 13px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-300);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.2px;
    white-space: nowrap;
    flex-shrink: 0;
}

.pill .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--emerald);
    box-shadow: 0 0 8px var(--emerald);
    flex-shrink: 0;
}

.pill.model .dot {
    background: var(--blue-glow);
    box-shadow: 0 0 8px var(--blue-glow);
}

/* Status badge (right) */
.status-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 16px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-bright);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-300);
    transition: all 0.3s var(--ease-smooth);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-500);
    transition: all 0.4s ease;
    flex-shrink: 0;
}

/* ─────────────────────────────────────────
   MAIN GRID
───────────────────────────────────────── */
.workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    flex-grow: 1;
    min-height: 0;
    overflow: hidden;
}

/* ─────────────────────────────────────────
   GLASS PANEL BASE
───────────────────────────────────────── */
.panel {
    background: #0d0f1a;
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-panel);
    transition: border-color 0.3s var(--ease-smooth);
}

.panel:hover {
    border-color: rgba(255, 255, 255, 0.16);
}

/* Panel section header */
.section-label {
    font-size: 0.67rem;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    color: var(--text-500);
    font-family: 'JetBrains Mono', monospace;
}


/* ─────────────────────────────────────────
   CHAT PANEL
───────────────────────────────────────── */
.chat-topbar {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    background: rgba(0, 0, 0, 0.12);
}

.chat-topbar-title h2 {
    font-family: 'Syne', sans-serif;
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-100);
    letter-spacing: -0.3px;
}

.chat-topbar-title p {
    font-size: 0.73rem;
    color: var(--text-300);
    margin-top: 1px;
}

.chat-topbar-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    color: var(--text-300);
    display: grid;
    place-items: center;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-100);
    border-color: var(--border-bright);
}

/* ─────────────────────────────────────────
   CHAT MESSAGES AREA
───────────────────────────────────────── */
.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 28px 28px 12px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.07) transparent;
}

.chat-messages::-webkit-scrollbar {
    width: 4px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.07);
    border-radius: 99px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.14);
}

/* ── Welcome Screen ── */
.welcome-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 20px;
    padding: 40px;
    animation: fadeUp 0.5s var(--ease-smooth);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-orb {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, rgba(59, 130, 246, 0.5), rgba(37, 99, 235, 0.9));
    border: 1px solid rgba(59, 130, 246, 0.4);
    display: grid;
    place-items: center;
    font-size: 2.4rem;
    animation: orb-float 5s ease-in-out infinite;
    box-shadow:
        0 0 0 16px rgba(37, 99, 235, 0.06),
        0 0 0 32px rgba(37, 99, 235, 0.03),
        var(--shadow-blue);
}

@keyframes orb-float {

    0%,
    100% {
        transform: translateY(0) scale(1);
    }

    50% {
        transform: translateY(-12px) scale(1.03);
    }
}

.welcome-state h3 {
    font-family: 'Syne', sans-serif;
    font-size: 1.7rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 30%, var(--blue-glow));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.welcome-state p {
    font-size: 0.93rem;
    color: var(--text-300);
    max-width: 440px;
    line-height: 1.75;
}

.welcome-steps {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.step-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    font-size: 0.78rem;
    color: var(--text-300);
    transition: all 0.2s ease;
}

.step-chip:hover {
    border-color: var(--border-bright);
    color: var(--text-100);
}

.step-num {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--blue-dim);
    border: 1px solid var(--border-accent);
    display: grid;
    place-items: center;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--blue-glow);
    flex-shrink: 0;
    font-family: 'JetBrains Mono', monospace;
}

/* ── Chat Message Rows ── */
.message-row {
    display: flex;
    gap: 12px;
    animation: msgIn 0.4s var(--ease-spring);
}

@keyframes msgIn {
    from {
        opacity: 0;
        transform: translateY(14px) scale(0.97);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

.avatar {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-size: 0.85rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.avatar.bot-avatar {
    background: var(--blue-dim);
    border: 1px solid var(--border-accent);
    color: var(--blue-glow);
}

.avatar.user-avatar {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.25);
    color: var(--emerald);
}

.message-body {
    display: flex;
    flex-direction: column;
    gap: 5px;
    max-width: 76%;
}

.user-row .message-body {
    align-items: flex-end;
}

.message-meta {
    font-size: 0.68rem;
    color: var(--text-500);
    font-family: 'JetBrains Mono', monospace;
    padding: 0 4px;
}

.bubble {
    padding: 13px 18px;
    border-radius: 18px;
    font-size: 0.93rem;
    line-height: 1.7;
    position: relative;
}

.bubble.bot-bubble {
    background: var(--bg-elevated);
    border: 1px solid var(--border-bright);
    color: var(--text-100);
    border-top-left-radius: 4px;
}

.bubble.user-bubble {
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    color: #fff;
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-top-right-radius: 4px;
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.3);
}

/* ── Typing Indicator ── */
.typing-indicator {
    display: flex;
    gap: 5px;
    align-items: center;
    padding: 14px 18px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-bright);
    border-radius: 18px;
    border-top-left-radius: 4px;
    width: fit-content;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue-glow);
    animation: typeBounce 0.9s ease-in-out infinite;
    box-shadow: 0 0 8px var(--blue-pulse);
}

.typing-dot:nth-child(2) {
    animation-delay: 0.18s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.36s;
}

@keyframes typeBounce {

    0%,
    80%,
    100% {
        transform: translateY(0);
        opacity: 0.5;
    }

    40% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* ── File Card ── */
.file-card-wrap {
    padding: 0;
}

.file-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideDown 0.3s var(--ease-spring);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px) scale(0.97);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.file-card-icon {
    width: 36px;
    height: 36px;
    background: rgba(239, 68, 68, 0.12);
    border-radius: 9px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}

.file-card-icon i {
    font-size: 1.05rem;
    color: #f87171;
}

.file-card-details {
    overflow: hidden;
    flex: 1;
    min-width: 0;
}

.file-card-name {
    font-size: 0.81rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-100);
}

.file-card-meta {
    font-size: 0.68rem;
    color: var(--text-300);
    margin-top: 2px;
    font-family: 'JetBrains Mono', monospace;
}

/* ── Progress Bar ── */
.progress-wrap {
    padding: 0;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--blue-glow);
    font-family: 'JetBrains Mono', monospace;
}

.progress-track {
    height: 4px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 100px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--blue-core), var(--blue-glow), #60a5fa);
    border-radius: 100px;
    transition: width 0.4s var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 1.4s infinite;
}

@keyframes shimmer {
    from {
        transform: translateX(-100%);
    }

    to {
        transform: translateX(100%);
    }
}

/* ─────────────────────────────────────────
   INPUT AREA
───────────────────────────────────────── */
.input-zone {
    padding: 18px 24px 20px;
    border-top: 1px solid var(--border-subtle);
    background: rgba(0, 0, 0, 0.18);
    flex-shrink: 0;
}

.input-box {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-lg);
    padding: 10px 10px 10px 14px;
    /* Reduced left padding to balance 14px */
    transition: all 0.3s var(--ease-smooth);
}

.input-box:focus-within {
    border-color: var(--blue-core);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12), var(--shadow-blue);
    background: rgba(17, 19, 32, 1);
}

.add-file-btn {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-bright);
    color: var(--text-300);
    font-size: 1.1rem;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: all 0.3s var(--ease-spring);
    flex-shrink: 0;
    margin-bottom: 0;
    /* Align with send-btn */
}

.add-file-btn:hover {
    background: var(--blue-dim);
    color: var(--blue-glow);
    border-color: var(--blue-glow);
    transform: scale(1.05);
}

.add-file-btn.drag-over {
    background: var(--blue-dim);
    border-color: var(--blue-glow);
    box-shadow: var(--shadow-blue);
    transform: scale(1.1);
}

.input-box textarea {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-100);
    font-size: 0.95rem;
    font-family: 'Inter', sans-serif;
    resize: none;
    max-height: 120px;
    line-height: 1.6;
    padding: 6px 0;
}

.input-box textarea::placeholder {
    color: var(--text-500);
}

.send-btn {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: var(--radius-sm);
    background: var(--blue-core);
    border: none;
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: all 0.3s var(--ease-spring);
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.35);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--blue-glow);
    transform: scale(1.08) rotate(-8deg);
    box-shadow: 0 6px 28px rgba(59, 130, 246, 0.5);
}

.send-btn:active:not(:disabled) {
    transform: scale(0.94);
}

.send-btn:disabled {
    background: rgba(255, 255, 255, 0.06);
    box-shadow: none;
    cursor: not-allowed;
    opacity: 0.45;
}

.input-footer {
    display: flex;
    justify-content: center;
    margin-top: 10px;
}

.input-footer span {
    font-size: 0.67rem;
    color: var(--text-500);
    font-family: 'JetBrains Mono', monospace;
}

.input-footer span b {
    color: var(--blue-glow);
    font-weight: 600;
}

/* ─────────────────────────────────────────
   UTILITY
───────────────────────────────────────── */
.hidden {
    display: none !important;
}

/* ─────────────────────────────────────────
   MOBILE SIDEBAR DRAWER & OVERLAY
───────────────────────────────────────── */

/* Full-screen dimming overlay behind drawer */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 50;
    background: rgba(0, 0, 0, 0.7);
    opacity: 0;
    transition: opacity 0.3s var(--ease-smooth);
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* Sidebar drawer state on mobile */
.mobile-menu-btn {
    display: none;
}

.sidebar-close-btn {
    display: none;
}

.mobile-upload-btn {
    display: none;
}

.hint-mobile {
    display: none;
}

.hint-desktop {
    display: inline;
}

/* ─────────────────────────────────────────
   BREAKPOINT: TABLET  (≤ 1024px)
───────────────────────────────────────── */
@media (max-width: 1024px) {

    .workspace {
        grid-template-columns: 280px 1fr;
    }

    .topbar-pills .pill-hide-sm {
        display: none;
    }

    .chat-messages {
        padding: 20px 20px 10px;
    }

    .bubble {
        font-size: 0.9rem;
    }

    .message-body {
        max-width: 84%;
    }
}

/* ─────────────────────────────────────────
   BREAKPOINT: MOBILE  (≤ 768px)
───────────────────────────────────────── */
@media (max-width: 768px) {

    /* Shell */
    .app-shell {
        padding: 8px;
        gap: 8px;
    }

    /* ── Topbar ── */
    .topbar {
        padding: 0 12px;
        height: 52px;
        border-radius: var(--radius-md);
        gap: 10px;
    }

    .topbar-pills {
        display: none;
    }

    .topbar .status-badge {
        margin-left: auto;
    }

    .logo-text {
        font-size: 1.05rem;
    }

    .status-badge {
        padding: 5px 10px;
        font-size: 0.7rem;
        gap: 5px;
        white-space: nowrap;
    }

    /* ── Workspace → single column ── */
    .workspace {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr;
        gap: 0;
    }

    /* ── Chat panel takes full height ── */
    .chat-engine {
        border-radius: var(--radius-lg);
    }

    /* Messages */
    .chat-messages {
        padding: 16px 14px 8px;
        gap: 14px;
    }

    .message-body {
        max-width: 90%;
    }

    .bubble {
        font-size: 0.88rem;
        padding: 11px 14px;
    }

    /* Input zone */
    .input-zone {
        padding: 12px 14px;
        padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    }

    .input-box {
        padding: 8px 8px 8px 12px;
        border-radius: var(--radius-md);
    }

    .add-file-btn {
        width: 38px;
        height: 38px;
        min-width: 38px;
    }

    .input-box textarea {
        font-size: 0.9rem;
    }

    .send-btn {
        width: 38px;
        height: 38px;
        min-width: 38px;
        font-size: 0.9rem;
    }

    /* Hint text swap */
    .hint-desktop {
        display: none;
    }

    .hint-mobile {
        display: inline;
    }
}

@media (max-width: 420px) {
    .topbar {
        padding: 0 10px;
    }

    .logo-icon {
        width: 28px;
        height: 28px;
        font-size: 13px;
        border-radius: 7px;
    }

    .chat-messages {
        padding: 12px 10px 6px;
    }

    .bubble {
        font-size: 0.85rem;
        padding: 10px 12px;
    }

    .welcome-orb {
        width: 60px;
        height: 60px;
        font-size: 1.6rem;
    }

    .welcome-state h3 {
        font-size: 1.15rem;
    }
}

/* ─────────────────────────────────────────
   SAFE AREA: NOTCH / DYNAMIC ISLAND
───────────────────────────────────────── */
@supports (padding-top: env(safe-area-inset-top)) {
    .topbar {
        padding-left: max(14px, env(safe-area-inset-left));
        padding-right: max(14px, env(safe-area-inset-right));
    }

    .input-zone {
        padding-bottom: max(12px, env(safe-area-inset-bottom));
    }
}