/* ==========================================================================
   Second Brain - Modern Design System & Styles
   ========================================================================== */

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Base Palette (Deep Obsidian / Graphite) */
    --bg-app: #080b11;
    --bg-surface: #0d121c;
    --bg-card: rgba(18, 24, 38, 0.75);
    --bg-card-hover: rgba(25, 34, 53, 0.85);
    --bg-input: rgba(14, 20, 32, 0.9);
    --border-subtle: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(255, 255, 255, 0.16);
    --border-focus: rgba(99, 102, 241, 0.5);

    /* Text Colors */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #0f172a;

    /* Accent & Brand Gradients */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.35);
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    --accent-subtle: rgba(99, 102, 241, 0.12);

    /* PARA Framework Colors */
    --para-projects: #10b981;
    --para-projects-bg: rgba(16, 185, 129, 0.14);
    --para-areas: #06b6d4;
    --para-areas-bg: rgba(6, 182, 212, 0.14);
    --para-resources: #8b5cf6;
    --para-resources-bg: rgba(139, 92, 246, 0.14);
    --para-archive: #f59e0b;
    --para-archive-bg: rgba(245, 158, 11, 0.14);

    /* Functional Colors */
    --success: #10b981;
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.35);
    --warning: #f59e0b;
    --info: #3b82f6;

    /* Elevation & Glass */
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.55);
    --backdrop-blur: blur(16px);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;
    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html, body {
    height: 100%;
    background-color: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Background Subtle Ambient Glow */
body::before {
    content: '';
    position: fixed;
    top: -150px;
    left: 20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, rgba(139, 92, 246, 0.05) 50%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    filter: blur(40px);
}

body::after {
    content: '';
    position: fixed;
    bottom: -150px;
    right: 15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, rgba(16, 185, 129, 0.04) 50%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    filter: blur(40px);
}

/* App Layout */
.app-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    background: rgba(13, 18, 28, 0.85);
    backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon-wrapper {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25), rgba(168, 85, 247, 0.25));
    border: 1px solid rgba(99, 102, 241, 0.4);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 16px var(--primary-glow);
}

.icon-brain {
    width: 24px;
    height: 24px;
    color: #a5b4fc;
}

.brand-title {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-subtitle {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: -2px;
}

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

.stat-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
}

.stat-label {
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    color: var(--text-primary);
    font-weight: 600;
    font-family: var(--font-mono);
}

.system-status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    color: var(--success);
    font-weight: 500;
    background: rgba(16, 185, 129, 0.08);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.85); }
}

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

.vault-badge {
    background: var(--primary);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 1px 7px;
    border-radius: var(--radius-full);
    margin-left: 4px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    text-decoration: none;
    line-height: 1;
}

.btn-icon {
    width: 16px;
    height: 16px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white;
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: var(--border-subtle);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

/* Main Container Grid */
.main-container {
    display: flex;
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 24px;
    gap: 24px;
    position: relative;
}

.stream-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    gap: 20px;
    padding-bottom: 120px;
}

/* Quick Banner */
.quick-banner {
    background: linear-gradient(135deg, rgba(20, 28, 44, 0.8), rgba(28, 38, 60, 0.6));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 18px 22px;
    box-shadow: var(--shadow-sm);
    backdrop-filter: var(--backdrop-blur);
}

.banner-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.banner-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.45;
    margin-bottom: 12px;
}

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

.chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.chip:hover {
    background: var(--accent-subtle);
    color: #c7d2fe;
    border-color: rgba(99, 102, 241, 0.4);
    transform: translateY(-1px);
}

/* Interaction Feed */
.interaction-feed {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.feed-item {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-md);
    backdrop-filter: var(--backdrop-blur);
    animation: fadeInSlide 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    transition: var(--transition);
}

.feed-item:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}

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

.feed-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.feed-timestamp {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Feature Grid in Welcome card */
.welcome-body h3 {
    font-size: 1.05rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.welcome-body p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    padding: 12px;
    border-radius: var(--radius-md);
}

.feature-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.feature-item strong {
    font-size: 0.85rem;
    color: var(--text-primary);
    display: block;
    margin-bottom: 2px;
}

.feature-item p {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.35;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.74rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-purple {
    background: var(--accent-subtle);
    color: #c7d2fe;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-projects {
    background: var(--para-projects-bg);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-areas {
    background: var(--para-areas-bg);
    color: #22d3ee;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-resources {
    background: var(--para-resources-bg);
    color: #c084fc;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-archive {
    background: var(--para-archive-bg);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

/* User Message Bubble */
.feed-item.user-message {
    background: rgba(30, 41, 65, 0.75);
    border-left: 3px solid var(--primary);
}

.user-message-text {
    font-size: 0.95rem;
    color: #f8fafc;
    white-space: pre-wrap;
    word-break: break-word;
}

.user-attached-preview {
    margin-top: 10px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.25);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Saved Note Card Display */
.saved-note-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.saved-note-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.tag-pill {
    background: rgba(255, 255, 255, 0.05);
    color: #a5b4fc;
    font-size: 0.74rem;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.saved-note-content {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-bottom: 14px;
    max-height: 180px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.saved-note-paths {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.path-row {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
}

.path-code {
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    color: #cbd5e1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.saved-note-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

/* Media Attachment Display in Feed Cards */
.media-display-box {
    margin-top: 12px;
    margin-bottom: 14px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
}

.media-image-preview {
    max-height: 320px;
    width: 100%;
    object-fit: contain;
    background: #000;
    display: block;
}

.media-audio-player {
    width: 100%;
    padding: 10px;
    outline: none;
}

.media-doc-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.02);
}

/* RAG Answer Display */
.rag-answer-body {
    font-size: 0.95rem;
    color: #e2e8f0;
    line-height: 1.6;
    margin-bottom: 16px;
}

.rag-answer-body p {
    margin-bottom: 10px;
}

.rag-answer-body ul, .rag-answer-body ol {
    margin-left: 20px;
    margin-bottom: 10px;
}

.rag-answer-body code {
    font-family: var(--font-mono);
    background: rgba(0, 0, 0, 0.4);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.85em;
    color: #a5b4fc;
}

.rag-temporal-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.74rem;
    color: #38bdf8;
    background: rgba(56, 189, 248, 0.1);
    padding: 3px 8px;
    border-radius: var(--radius-full);
    margin-bottom: 12px;
}

/* Citations & Sources List */
.sources-accordion {
    margin-top: 14px;
    border-top: 1px solid var(--border-subtle);
    padding-top: 12px;
}

.sources-header {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.source-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    margin-bottom: 8px;
    transition: var(--transition);
}

.source-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-hover);
}

.source-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}

.source-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
}

.source-snippet {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 6px;
}

.source-links {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
}

/* Retrieval Result Card */
.retrieval-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-md);
    margin-top: 10px;
}

/* Docked Input Deck */
.input-deck-wrapper {
    position: fixed;
    bottom: 20px;
    left: 0;
    right: 0;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
    z-index: 40;
    pointer-events: none;
}

.input-deck {
    pointer-events: auto;
    background: rgba(13, 18, 28, 0.92);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
    backdrop-filter: var(--backdrop-blur);
    padding: 10px 14px;
    position: relative;
    transition: var(--transition);
}

.input-deck:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 20px 50px rgba(99, 102, 241, 0.25);
}

/* Mode Tabs */
.deck-mode-tabs {
    display: flex;
    align-items: center;
    gap: 6px;
    padding-bottom: 8px;
    margin-bottom: 6px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    overflow-x: auto;
}

.mode-tab {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.mode-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.mode-tab.active {
    background: var(--accent-subtle);
    color: #c7d2fe;
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

/* Attachment Preview Strip */
.attachment-preview-strip {
    padding: 6px 0 10px 0;
    animation: fadeInSlide 0.2s ease;
}

.attachment-preview-card {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 6px 12px;
}

.preview-media-container {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-details {
    display: flex;
    flex-direction: column;
}

.preview-name {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preview-meta {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.btn-remove-attachment {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove-attachment:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.icon-small {
    width: 14px;
    height: 14px;
}

/* Voice Recorder Live Bar */
.voice-recorder-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    padding: 8px 14px;
    margin-bottom: 8px;
    animation: fadeInSlide 0.2s ease;
}

.recording-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: #f87171;
}

.recording-pulse {
    width: 10px;
    height: 10px;
    background: var(--danger);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--danger);
    animation: pulse 1s infinite alternate;
}

.recording-timer {
    font-family: var(--font-mono);
    color: #fca5a5;
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.wave-animation {
    display: flex;
    align-items: center;
    gap: 3px;
    height: 16px;
}

.wave-animation span {
    width: 3px;
    height: 100%;
    background: #f87171;
    border-radius: 3px;
    animation: wave 1.2s infinite ease-in-out;
}

.wave-animation span:nth-child(2) { animation-delay: -1.1s; }
.wave-animation span:nth-child(3) { animation-delay: -1.0s; }
.wave-animation span:nth-child(4) { animation-delay: -0.9s; }
.wave-animation span:nth-child(5) { animation-delay: -0.8s; }

@keyframes wave {
    0%, 40%, 100% { transform: scaleY(0.4); }
    20% { transform: scaleY(1.0); }
}

.recording-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Input Form Row */
.input-box-row {
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

.icon-btn-action {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    height: 38px;
    width: 38px;
    flex-shrink: 0;
}

.icon-btn-action:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.btn-mic:hover {
    color: #f87171;
    background: rgba(239, 68, 68, 0.12);
}

.input-icon {
    width: 20px;
    height: 20px;
}

.thought-textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    line-height: 1.45;
    padding: 8px 4px;
    resize: none;
    outline: none;
    min-height: 38px;
    max-height: 160px;
}

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

.btn-submit {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px var(--primary-glow);
    flex-shrink: 0;
}

.btn-submit:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 18px var(--primary-glow);
}

.btn-submit:active {
    transform: scale(0.96);
}

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

/* Drag and Drop Overlay */
.drag-drop-overlay {
    position: absolute;
    inset: 0;
    background: rgba(13, 18, 28, 0.95);
    border: 2px dashed var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    backdrop-filter: var(--backdrop-blur);
    animation: fadeInSlide 0.15s ease;
}

.drop-content {
    text-align: center;
    color: var(--text-primary);
}

.drop-icon {
    width: 48px;
    height: 48px;
    color: var(--primary);
    margin-bottom: 8px;
}

.drop-content h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.drop-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Vault Explorer Drawer */
.vault-drawer {
    width: 360px;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-subtle);
    position: fixed;
    top: 71px;
    right: 0;
    bottom: 0;
    z-index: 45;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.vault-drawer.open {
    transform: translateX(0);
}

.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
}

.drawer-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.drawer-icon {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

.btn-close-drawer {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-close-drawer:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.btn-close-drawer svg {
    width: 18px;
    height: 18px;
}

.drawer-search {
    padding: 12px 18px;
}

.search-input-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 8px 12px;
}

.search-icon {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
}

.search-input-wrap input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    outline: none;
    width: 100%;
}

.category-pills {
    display: flex;
    gap: 6px;
    padding: 0 18px 12px 18px;
    overflow-x: auto;
}

.cat-pill {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.cat-pill.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 18px 24px 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.note-item-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.note-item-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.note-item-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.note-item-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    line-height: 1.35;
}

.note-item-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Loading Spinners */
.loading-spinner-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
    animation: fadeInSlide 0.2s ease;
}

.modal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 720px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: 6px;
    color: var(--text-primary);
}

.modal-path {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    display: block;
    margin-top: 2px;
}

.btn-close-modal {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-close-modal:hover {
    color: var(--text-primary);
}

.btn-close-modal svg {
    width: 20px;
    height: 20px;
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
    font-size: 0.92rem;
    line-height: 1.65;
    color: var(--text-secondary);
    white-space: pre-wrap;
    font-family: var(--font-sans);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-subtle);
    background: rgba(0, 0, 0, 0.2);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 110;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    background: rgba(18, 24, 38, 0.95);
    border: 1px solid var(--border-hover);
    color: var(--text-primary);
    padding: 12px 18px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    backdrop-filter: var(--backdrop-blur);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: fadeInSlide 0.25s ease;
}

.toast.toast-success {
    border-left: 3px solid var(--success);
}

.toast.toast-error {
    border-left: 3px solid var(--danger);
}

/* Utility Helpers */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Responsive Media Queries */
@media (max-width: 900px) {
    .app-header {
        padding: 12px 16px;
    }

    .main-container {
        padding: 14px;
    }

    .input-deck-wrapper {
        padding: 0 12px;
        bottom: 12px;
    }

    .header-stats {
        display: none;
    }

    .vault-drawer {
        width: 100%;
        max-width: 380px;
    }
}

/* ==========================================================================
   Authentication Gate (Public Domain & Security Layer)
   ========================================================================== */
.auth-gate-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: radial-gradient(circle at 50% 20%, rgba(30, 27, 75, 0.5) 0%, rgba(8, 11, 17, 0.95) 80%);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.28s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.28s;
}

.auth-gate-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.auth-card {
    background: rgba(18, 24, 38, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    box-shadow: 0 25px 65px rgba(0, 0, 0, 0.65), 0 0 50px rgba(99, 102, 241, 0.2);
    padding: 40px 32px;
    width: 100%;
    max-width: 440px;
    text-align: center;
    animation: authCardIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes authCardIn {
    from {
        transform: scale(0.94) translateY(12px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.auth-logo-wrapper {
    width: 68px;
    height: 68px;
    margin: 0 auto 16px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25), rgba(168, 85, 247, 0.25));
    border: 1px solid rgba(99, 102, 241, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.35);
}

.auth-logo-wrapper svg {
    width: 36px;
    height: 36px;
    stroke: #c084fc;
}

.auth-title {
    font-size: 24px;
    font-weight: 700;
    color: #f8fafc;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.auth-subtitle {
    font-size: 14px;
    color: #94a3b8;
    margin-bottom: 16px;
}

.auth-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    background: rgba(99, 102, 241, 0.12);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 9999px;
    font-size: 12px;
    color: #a5b4fc;
    font-weight: 500;
    margin-bottom: 24px;
}

.auth-badge .badge-icon {
    width: 14px;
    height: 14px;
}

.auth-error-banner {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.35);
    border-radius: 10px;
    color: #fca5a5;
    font-size: 13px;
    margin-bottom: 18px;
    text-align: left;
    animation: shakeError 0.35s ease;
}

.auth-error-banner .error-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: #ef4444;
}

.auth-error-banner.hidden {
    display: none !important;
}

@keyframes shakeError {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}

.auth-form .form-group {
    text-align: left;
    margin-bottom: 16px;
}

.auth-form label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #94a3b8;
    margin-bottom: 8px;
}

.auth-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.auth-input-wrapper input {
    width: 100%;
    padding: 13px 44px 13px 14px;
    background: rgba(14, 20, 32, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 12px;
    color: #f8fafc;
    font-size: 14px;
    font-family: var(--font-mono);
    outline: none;
    transition: var(--transition);
}

.auth-input-wrapper input:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
    background: rgba(18, 24, 38, 1);
}

.btn-toggle-eye {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: #64748b;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    border-radius: 6px;
    transition: var(--transition);
}

.btn-toggle-eye:hover {
    color: #f1f5f9;
}

.btn-toggle-eye svg {
    width: 18px;
    height: 18px;
}

.auth-options {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin: 14px 0 22px;
    font-size: 13px;
    color: #94a3b8;
}

.remember-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.remember-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #6366f1;
    border-radius: 4px;
    cursor: pointer;
}

.btn-unlock {
    width: 100%;
    padding: 13px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 18px rgba(99, 102, 241, 0.4);
    transition: var(--transition);
}

.btn-unlock:hover {
    box-shadow: 0 6px 24px rgba(99, 102, 241, 0.55);
    transform: translateY(-1px);
}

.btn-unlock .btn-arrow-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.2s ease;
}

.btn-unlock:hover .btn-arrow-icon {
    transform: translateX(4px);
}

.auth-footer-note {
    margin-top: 24px;
    font-size: 11.5px;
    color: #64748b;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 18px;
}

/* User Profile & Quota Pill */
.user-profile-pill {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 5px 12px 5px 6px;
    background: rgba(18, 24, 38, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.user-profile-pill:hover {
    border-color: rgba(99, 102, 241, 0.4);
    background: rgba(25, 34, 53, 0.95);
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    color: #ffffff;
    font-weight: 700;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
    flex-shrink: 0;
}

.user-details {
    display: flex;
    flex-direction: column;
    text-align: left;
    line-height: 1.2;
}

.user-name {
    font-size: 12.5px;
    font-weight: 600;
    color: #f1f5f9;
}

.user-quota {
    font-size: 10.5px;
    color: #94a3b8;
    font-family: var(--font-mono);
}