/* ============================================
   LinkGraph — Add Relationship Page
   Modern glassmorphism + clean design
   ============================================ */

:root {
    --c-bg:        #06080f;
    --c-surface:   rgba(15, 20, 35, 0.7);
    --c-surface-2: rgba(22, 28, 48, 0.6);
    --c-elevated:  rgba(28, 36, 62, 0.55);
    --c-input:     rgba(20, 26, 50, 0.65);
    --c-border:    rgba(60, 75, 120, 0.25);
    --c-border-h:  rgba(99, 102, 241, 0.35);
    --c-text:      #e8ecf4;
    --c-text-2:    #8b95b0;
    --c-text-3:    #4d5670;
    --c-primary:   #818cf8;
    --c-primary-d: #6366f1;
    --c-accent:    #a78bfa;
    --c-green:     #34d399;
    --c-green-d:   #059669;
    --c-red:       #f87171;
    --c-glow:      rgba(99, 102, 241, 0.12);
    --radius:      14px;
    --radius-sm:   10px;
    --radius-xs:   7px;
    --ease:        cubic-bezier(0.4, 0, 0.2, 1);
    --fast:        150ms var(--ease);
    --med:         250ms var(--ease);
}

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

html { font-size: 15px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'PingFang SC', 'Hiragino Sans GB', 'Segoe UI', sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.hidden { display: none !important; }

/* ---- Ambient Glow ---- */
.page { position: relative; min-height: 100vh; overflow-x: hidden; }

.ambient-glow {
    position: fixed; top: -180px; left: 50%; transform: translateX(-50%);
    width: 700px; height: 500px;
    background: radial-gradient(ellipse, rgba(99,102,241,0.08) 0%, rgba(167,139,250,0.04) 40%, transparent 70%);
    pointer-events: none; z-index: 0;
}

/* ---- Navbar ---- */
.navbar {
    position: sticky; top: 0; z-index: 50;
    display: flex; align-items: center; gap: 12px;
    padding: 12px 20px;
    background: rgba(6, 8, 15, 0.75);
    backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--c-border);
}

.nav-back {
    display: grid; place-items: center;
    width: 36px; height: 36px;
    border-radius: var(--radius-xs);
    color: var(--c-text-2);
    text-decoration: none;
    transition: all var(--fast);
}
.nav-back:hover { background: var(--c-glow); color: var(--c-primary); }

.nav-title {
    display: flex; align-items: center; gap: 8px;
    font-weight: 700; font-size: 1.05rem;
    background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-logo { width: 24px; height: 24px; border-radius: 5px; }
.nav-spacer { flex: 1; }

/* ---- Content ---- */
.content {
    position: relative; z-index: 1;
    max-width: 640px;
    margin: 0 auto;
    padding: 28px 18px 80px;
}

/* ---- Card ---- */
.card {
    position: relative;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 18px;
    backdrop-filter: blur(16px) saturate(1.3);
    overflow: hidden;
    margin-bottom: 20px;
}

.card-inner { padding: 22px; }

.card-ai { border-color: rgba(99, 102, 241, 0.18); }

.card-glow {
    position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--c-primary-d), var(--c-accent), #ec4899, var(--c-primary-d));
    background-size: 200% 100%;
    animation: shimmer 4s linear infinite;
}

@keyframes shimmer { to { background-position: 200% 0; } }

/* ---- Section Head ---- */
.section-head {
    display: flex; align-items: center; gap: 14px;
    margin-bottom: 18px;
}

.icon-badge {
    width: 42px; height: 42px; border-radius: 12px;
    display: grid; place-items: center;
    flex-shrink: 0;
}

.icon-badge-ai {
    background: linear-gradient(135deg, var(--c-primary-d), var(--c-accent));
    color: white;
    box-shadow: 0 4px 20px rgba(99,102,241,0.3);
}

.section-title {
    font-size: 1.05rem; font-weight: 700; color: var(--c-text);
    margin-bottom: 1px;
}

.section-desc { font-size: 0.8rem; color: var(--c-text-2); }

/* ---- Inputs ---- */
.input {
    width: 100%;
    padding: 10px 14px;
    background: var(--c-input);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    color: var(--c-text);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--fast);
    outline: none;
}

.input::placeholder { color: var(--c-text-3); }

.input:hover { border-color: rgba(60,75,120,0.45); }

.input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px var(--c-glow);
    background: rgba(20, 26, 50, 0.9);
}

.textarea { resize: vertical; line-height: 1.6; min-height: 64px; }

.select {
    padding: 10px 10px;
    background: var(--c-input);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    color: var(--c-text);
    font-size: 0.82rem;
    font-family: inherit;
    cursor: pointer;
    outline: none;
    transition: border-color var(--fast);
    min-width: 70px;
}
.select:focus { border-color: var(--c-primary); }

/* ---- Field ---- */
.field { margin-bottom: 22px; }

.field-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--c-text-2);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.field-wrap { position: relative; }

/* ---- Row Group ---- */
.row-group {
    display: flex; align-items: center; gap: 6px;
    margin-bottom: 6px;
}
.row-group .input { flex: 1; }
.row-group .relation-input {
    flex: 0 0 42%;
    font-size: 0.82rem;
    color: var(--c-accent);
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 7px;
    padding: 10px 22px;
    border: none; border-radius: var(--radius-sm);
    font-size: 0.88rem; font-weight: 600; font-family: inherit;
    cursor: pointer;
    transition: all var(--med);
    position: relative; overflow: hidden;
}

.btn-gradient {
    background: linear-gradient(135deg, var(--c-primary-d) 0%, #7c3aed 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(99,102,241,0.35), inset 0 1px 0 rgba(255,255,255,0.1);
}
.btn-gradient:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 28px rgba(99,102,241,0.4), inset 0 1px 0 rgba(255,255,255,0.15);
}
.btn-gradient:active { transform: translateY(0); }
.btn-gradient:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-outline {
    background: transparent;
    border: 1px solid var(--c-border);
    color: var(--c-text-2);
}
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); background: var(--c-glow); }

.btn-success {
    background: var(--c-green-d);
    color: white;
    padding: 6px 14px;
    font-size: 0.78rem;
    border-radius: var(--radius-xs);
    box-shadow: 0 2px 10px rgba(5,150,105,0.3);
}
.btn-success:hover { box-shadow: 0 4px 16px rgba(5,150,105,0.4); }

.btn-sm { padding: 6px 14px; font-size: 0.78rem; border-radius: var(--radius-xs); }
.btn-lg { padding: 13px 28px; font-size: 0.95rem; }
.btn-full { width: 100%; }

.btn-label { display: inline-flex; align-items: center; gap: 6px; }
.btn-spinner { display: inline-flex; align-items: center; gap: 8px; }

.btn-icon {
    display: grid; place-items: center;
    width: 36px; height: 36px;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-xs);
    background: transparent;
    color: var(--c-text-3);
    cursor: pointer;
    transition: all var(--fast);
    flex-shrink: 0;
}
.btn-icon:hover, label.btn-icon:hover { border-color: var(--c-border-h); color: var(--c-primary); background: var(--c-glow); }
.btn-icon-danger:hover { border-color: rgba(248,113,113,0.3); color: var(--c-red); background: rgba(248,113,113,0.08); }
.btn-icon-muted { color: var(--c-text-3); }

.btn-ghost {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    width: 100%;
    padding: 9px;
    border: 1px dashed var(--c-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--c-text-3);
    font-size: 0.82rem; font-family: inherit;
    cursor: pointer;
    transition: all var(--fast);
}
.btn-ghost:hover { border-color: var(--c-primary); color: var(--c-primary); background: var(--c-glow); }

/* dot-loader */
.dot-loader {
    display: inline-flex; gap: 4px; align-items: center; height: 14px;
}
.dot-loader::before, .dot-loader::after, .dot-loader {
    content: '';
}
.dot-loader::before, .dot-loader::after {
    width: 5px; height: 5px; border-radius: 50%;
    background: currentColor; opacity: 0.6;
    animation: dotPulse 1.2s ease-in-out infinite;
}
.dot-loader::after { animation-delay: 0.4s; }
@keyframes dotPulse { 0%,100%{opacity:0.3;transform:scale(0.8)} 50%{opacity:1;transform:scale(1)} }

/* ---- Dropzone ---- */
.dropzone {
    position: relative;
    border: 1.5px dashed rgba(99,102,241,0.2);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--med);
    margin: 12px 0;
    overflow: hidden;
}

.dropzone:hover, .dropzone.drag-over {
    border-color: var(--c-primary);
    background: rgba(99,102,241,0.04);
}

.dropzone.drag-over {
    border-color: var(--c-accent);
    background: rgba(167,139,250,0.06);
    transform: scale(1.005);
}

.dropzone-inner {
    padding: 22px 16px;
    text-align: center;
    pointer-events: none;
}

.dropzone-icon {
    display: inline-grid; place-items: center;
    width: 44px; height: 44px;
    border-radius: 12px;
    background: var(--c-glow);
    color: var(--c-primary);
    margin-bottom: 8px;
}

.dropzone-inner p { font-size: 0.82rem; color: var(--c-text-2); }
.dropzone-inner .link { color: var(--c-primary); font-weight: 600; }
.dropzone-inner .hint { font-size: 0.72rem; color: var(--c-text-3); margin-top: 2px; }

/* ---- File Chips ---- */
.file-chips {
    display: flex; flex-wrap: wrap; gap: 6px;
    margin-bottom: 12px;
}

.file-chip {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 10px;
    background: var(--c-elevated);
    border: 1px solid var(--c-border);
    border-radius: 8px;
    font-size: 0.78rem;
    animation: fadeUp 0.2s var(--ease);
}

.file-chip-thumb {
    width: 32px; height: 32px;
    border-radius: 6px;
    object-fit: cover;
}

.file-chip-icon {
    width: 24px; height: 24px;
    border-radius: 5px;
    background: var(--c-glow);
    display: grid; place-items: center;
    color: var(--c-primary);
}

.file-chip-name {
    max-width: 120px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    font-weight: 500;
}

.file-chip-size { color: var(--c-text-3); font-size: 0.7rem; }

.file-chip-close {
    background: none; border: none;
    color: var(--c-text-3);
    cursor: pointer; padding: 2px;
    border-radius: 4px;
    display: grid; place-items: center;
    transition: all var(--fast);
}
.file-chip-close:hover { color: var(--c-red); background: rgba(248,113,113,0.1); }

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---- Result Box ---- */
.result-box {
    margin-top: 16px;
    background: rgba(5, 150, 105, 0.06);
    border: 1px solid rgba(52, 211, 153, 0.15);
    border-radius: var(--radius);
    padding: 16px;
    animation: fadeUp 0.3s var(--ease);
}

.result-head {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 12px;
}

.result-badge {
    display: flex; align-items: center; gap: 6px;
    font-size: 0.82rem; font-weight: 600;
    color: var(--c-green);
}

.entity-card {
    padding: 12px;
    background: var(--c-input);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

/* Entity card editable */
.entity-head {
    display: flex; align-items: center; gap: 6px;
    margin-bottom: 8px;
}

.entity-core-input {
    flex: 1;
    background: transparent;
    border: none; border-bottom: 1.5px solid var(--c-border);
    padding: 4px 2px;
    font-size: 0.92rem; font-weight: 700;
    color: var(--c-primary);
    font-family: inherit;
    outline: none;
    transition: border-color var(--fast);
    border-radius: 0;
}
.entity-core-input:focus { border-color: var(--c-primary); }
.entity-core-input::placeholder { color: var(--c-text-3); font-weight: 400; }

.entity-remove-btn {
    background: none; border: none;
    color: var(--c-text-3); font-size: 1.2rem;
    cursor: pointer; padding: 2px 6px;
    border-radius: 4px;
    transition: all var(--fast);
    line-height: 1;
}
.entity-remove-btn:hover { color: var(--c-red); background: rgba(248,113,113,0.1); }

.entity-tags {
    display: flex; flex-wrap: wrap; gap: 5px;
    min-height: 24px;
    padding-left: 2px;
    margin-bottom: 8px;
}

.entity-add-wrap {
    padding-left: 2px;
}

.entity-add-input {
    width: 100%;
    background: var(--c-input);
    border: 1px dashed var(--c-border);
    border-radius: 8px;
    padding: 7px 10px;
    font-size: 0.78rem;
    color: var(--c-text);
    font-family: inherit;
    outline: none;
    transition: border-color var(--fast);
}
.entity-add-input:focus { border-color: var(--c-primary); border-style: solid; }
.entity-add-input::placeholder { color: var(--c-text-3); }

.btn-add-entity {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    width: 100%;
    padding: 9px;
    margin-top: 8px;
    border: 1px dashed var(--c-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--c-text-3);
    font-size: 0.78rem; font-family: inherit;
    cursor: pointer;
    transition: all var(--fast);
}
.btn-add-entity:hover { border-color: var(--c-primary); color: var(--c-primary); background: var(--c-glow); }

.tag {
    padding: 3px 11px;
    background: var(--c-glow);
    border-radius: 20px;
    font-size: 0.76rem; font-weight: 500;
    color: var(--c-primary);
    cursor: pointer;
    transition: all var(--fast);
    user-select: none;
    position: relative;
}
.tag:hover { background: var(--c-primary); color: white; }
.tag:hover .tag-relation { color: rgba(255,255,255,0.7); }
.tag.removed { opacity: 0.3; text-decoration: line-through; color: var(--c-text-3); background: var(--c-input); }
.tag.editing { padding: 0; background: transparent; }

.tag-relation {
    font-size: 0.68rem;
    color: var(--c-accent);
    font-weight: 400;
    margin-left: 2px;
}

.tag-edit-input {
    background: var(--c-input);
    border: 1px solid var(--c-primary);
    border-radius: 16px;
    padding: 3px 10px;
    font-size: 0.76rem;
    color: var(--c-text);
    font-family: inherit;
    outline: none;
    width: 90px;
    box-shadow: 0 0 0 2px var(--c-glow);
}

/* ---- Separator ---- */
.separator {
    display: flex; align-items: center; gap: 16px;
    margin: 24px 0;
    color: var(--c-text-3);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}
.separator::before, .separator::after {
    content: ''; flex: 1;
    border-bottom: 1px solid var(--c-border);
}

/* ---- Collapse ---- */
.collapse {
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    margin-bottom: 22px;
    overflow: hidden;
}

.collapse-trigger {
    display: flex; align-items: center; gap: 8px;
    padding: 11px 14px;
    font-size: 0.82rem; font-weight: 500;
    color: var(--c-text-2);
    cursor: pointer;
    transition: color var(--fast);
    list-style: none;
}
.collapse-trigger::-webkit-details-marker { display: none; }
.collapse-trigger:hover { color: var(--c-primary); }

.collapse[open] .collapse-trigger { border-bottom: 1px solid var(--c-border); }

.collapse-body { padding: 14px; display: flex; flex-direction: column; gap: 8px; }

/* ---- Actions ---- */
.actions {
    display: flex; gap: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--c-border);
}
.actions .btn-gradient { flex: 1; }

/* ---- Dropdown ---- */
.dropdown {
    position: absolute; top: 100%; left: 0; right: 0;
    margin-top: 4px;
    background: rgba(18, 24, 44, 0.96);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(16px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.5);
    max-height: 180px; overflow-y: auto;
    z-index: 20;
}

.dropdown-item {
    padding: 9px 14px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--fast);
}
.dropdown-item:hover { background: var(--c-glow); color: var(--c-primary); }

/* ---- Image Grid ---- */
.img-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 6px;
    margin-bottom: 8px;
}

.img-grid-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--c-border);
    aspect-ratio: 1;
    animation: fadeUp 0.2s var(--ease);
}
.img-grid-item img { width: 100%; height: 100%; object-fit: cover; }

.img-grid-item .img-remove {
    position: absolute; top: 3px; right: 3px;
    width: 20px; height: 20px;
    background: rgba(0,0,0,0.65); border: none; border-radius: 50%;
    color: white; font-size: 11px;
    display: grid; place-items: center;
    cursor: pointer;
    opacity: 0; transition: opacity var(--fast);
}
.img-grid-item:hover .img-remove { opacity: 1; }

/* ---- Toast ---- */
.toast {
    position: fixed; bottom: 28px; left: 50%;
    transform: translateX(-50%);
    padding: 11px 28px;
    border-radius: 12px;
    font-size: 0.85rem; font-weight: 500;
    color: white;
    background: var(--c-green-d);
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    z-index: 999;
    animation: toastPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.toast.error { background: #dc2626; }

@keyframes toastPop {
    from { transform: translateX(-50%) translateY(24px) scale(0.92); opacity: 0; }
    to   { transform: translateX(-50%) translateY(0) scale(1); opacity: 1; }
}

/* ---- Recent ---- */
.recent { padding-top: 20px; }

.recent-title {
    font-size: 0.72rem; font-weight: 600;
    color: var(--c-text-3);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 12px;
}

.recent-item {
    padding: 12px 14px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
    transition: all var(--fast);
}
.recent-item:hover { border-color: var(--c-border-h); background: var(--c-surface-2); }

.recent-core {
    font-weight: 600; font-size: 0.88rem;
    color: var(--c-primary);
    margin-bottom: 2px;
}

.recent-related {
    font-size: 0.76rem;
    color: var(--c-text-2);
    line-height: 1.5;
}

/* ---- Empty ---- */
.empty { font-size: 0.78rem; color: var(--c-text-3); font-style: italic; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(60,75,120,0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(60,75,120,0.5); }

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .content { padding: 16px 12px 60px; }
    .card-inner { padding: 16px; }
    .card { border-radius: var(--radius); }
    .navbar { padding: 10px 14px; }
    .row-group { flex-wrap: wrap; }
    .row-group .select { width: 100%; }
}