:root {
    color-scheme: dark;
    font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --bg: #050816;
    --surface: #0f1629;
    --surface-elevated: #151f36;
    --surface-highlight: #1d2b4d;
    --border: rgba(148, 163, 184, 0.15);
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-strong: #2563eb;
    --danger: #ef4444;
    --danger-strong: #dc2626;
    --shadow: 0 30px 60px rgba(15, 23, 42, 0.35);
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
}

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

body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, rgba(59, 130, 246, 0.2), transparent 55%),
        radial-gradient(circle at 20% 80%, rgba(168, 85, 247, 0.18), transparent 60%),
        var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 0 0 1.75rem;
}

.hidden {
    display: none !important;
}

.app-shell {
    width: min(1280px, 94vw);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0 auto;
}

.nav-container {
    width: min(1280px, 94vw);
    position: relative;
    margin: 0 auto 1.25rem;
    padding: 0.6rem 0.85rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
    background: linear-gradient(150deg, rgba(8, 13, 26, 0.94), rgba(16, 28, 52, 0.78));
    border: 1px solid rgba(59, 130, 246, 0.26);
    border-radius: 10px;
    box-shadow: 0 26px 56px rgba(5, 9, 22, 0.55);
    backdrop-filter: blur(16px);
    overflow: visible;
    z-index: 1000;
}

.nav-container::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.2), transparent 60%),
                radial-gradient(circle at bottom right, rgba(30, 64, 175, 0.18), transparent 55%);
    pointer-events: none;
    opacity: 0.9;
    border-radius: inherit;
}

.nav-bar {
    position: relative;
    z-index: 1;
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.nav-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    white-space: nowrap;
}

.nav-toggle {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.35rem;
    height: 2.35rem;
    border-radius: 999px;
    border: 1px solid rgba(59, 130, 246, 0.45);
    background: rgba(59, 130, 246, 0.2);
    color: var(--text);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 14px 28px rgba(5, 9, 22, 0.35);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
    background: rgba(59, 130, 246, 0.3);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 20px 36px rgba(5, 9, 22, 0.45);
    outline: none;
}

.nav-toggle .icon {
    pointer-events: none;
    font-size: 1.2rem;
}

.nav-toggle .icon-close {
    display: none;
}

.nav-toggle.open .icon-close {
    display: inline;
}

.nav-toggle.open .icon-hamburger {
    display: none;
}

.navigation {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.nav-drawer {
    position: fixed;
    inset: 0 auto 0 0;
    height: 100vh;
    width: min(280px, 82%);
    padding: 1.4rem 1.25rem;
    background: rgba(6, 12, 24, 0.96);
    border-right: 1px solid rgba(59, 130, 246, 0.24);
    box-shadow: 0 30px 60px rgba(4, 9, 22, 0.55);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1001;
    overflow-y: auto;
    backdrop-filter: blur(16px);
}

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

.nav-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1.2rem;
    background: rgba(14, 22, 40, 0.78);
    border: 1px solid rgba(148, 163, 184, 0.24);
    border-radius: 10px;
    color: rgba(226, 232, 240, 0.9);
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition), background var(--transition);
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.24), rgba(99, 102, 241, 0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-link > * {
    position: relative;
    z-index: 1;
}

.nav-link-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 999px;
    background: linear-gradient(150deg, rgba(59, 130, 246, 0.28), rgba(99, 102, 241, 0.16));
    border: 1px solid rgba(59, 130, 246, 0.42);
    color: rgba(224, 231, 255, 0.95);
    box-shadow: inset 0 0 0 1px rgba(6, 12, 24, 0.85);
    transition: background var(--transition), color var(--transition), box-shadow var(--transition);
    flex-shrink: 0;
}

.nav-link-icon i {
    font-size: 1.05rem;
}

.nav-link-text {
    font-size: 0.96rem;
}

.nav-link:hover {
    color: var(--text);
    border-color: rgba(59, 130, 246, 0.45);
    box-shadow: 0 20px 38px rgba(5, 9, 22, 0.45);
    transform: translateY(-1px);
}

.nav-link:hover::before {
    opacity: 1;
}

.nav-link:hover .nav-link-icon {
    background: linear-gradient(150deg, rgba(59, 130, 246, 0.42), rgba(99, 102, 241, 0.28));
    color: #fff;
    box-shadow: 0 14px 28px rgba(5, 9, 22, 0.5);
}

.nav-link.active {
    color: #0b1120;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.95), rgba(37, 99, 235, 0.9));
    border-color: rgba(59, 130, 246, 0.7);
    box-shadow: 0 24px 40px rgba(5, 9, 22, 0.5);
    transform: translateY(-1px);
}

.nav-link.active::before {
    opacity: 1;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.32), rgba(37, 99, 235, 0.18));
}

.nav-link.active .nav-link-icon {
    background: rgba(8, 15, 32, 0.35);
    border-color: rgba(255, 255, 255, 0.45);
    color: #fff;
    box-shadow: 0 16px 32px rgba(5, 9, 22, 0.5);
}

.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(4, 7, 18, 0.55);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.nav-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

@media (min-width: 768px) {
    .nav-container {
        width: min(1360px, 90vw);
        padding: 0.75rem 1.1rem;
        gap: 1.2rem;
    }

    .nav-bar {
        flex: 0 0 auto;
    }

    .nav-toggle {
        display: none;
    }

    .nav-overlay {
        display: none !important;
    }

.nav-drawer {
    position: static;
    transform: none;
        height: auto;
        width: auto;
        padding: 0;
        background: transparent;
        border: none;
        box-shadow: none;
        overflow: visible;
    }

    .navigation {
        flex-direction: row;
        align-items: center;
        justify-content: flex-end;
        gap: 0.75rem;
        flex-wrap: nowrap;
    }

.nav-link {
        padding: 0.65rem 1.3rem;
        border-radius: 10px;
        background: rgba(12, 20, 36, 0.58);
        border-color: rgba(59, 130, 246, 0.3);
        box-shadow: none;
    }

    .nav-link:hover {
        box-shadow: 0 18px 36px rgba(5, 9, 22, 0.45);
    }

    .nav-link.active {
        box-shadow: 0 22px 40px rgba(5, 9, 22, 0.5);
    }

    .nav-link-icon {
        width: 2.15rem;
        height: 2.15rem;
    }
}

.landing {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 3.5rem 1.5rem 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
    text-align: center;
}

.landing-topbar {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.landing-brand {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
}

.landing-brand span {
    color: var(--primary);
}

.lang-button {
    border: 1px solid rgba(148, 163, 184, 0.4);
    background: rgba(15, 23, 42, 0.4);
    color: var(--text);
    padding: 0.55rem 1.35rem;
    border-radius: 999px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.lang-button:hover {
    background: rgba(37, 99, 235, 0.35);
    color: #fff;
    transform: translateY(-1px);
}

.landing-hero {
    display: grid;
    gap: 0.85rem;
    max-width: 720px;
}

.landing-subtitle {
    margin: 0;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.landing-hero h1 {
    margin: 0;
    font-size: clamp(2rem, 3vw + 1rem, 3.1rem);
    line-height: 1.15;
}

.landing-description {
    margin: 0 auto;
    max-width: 540px;
    color: rgba(226, 232, 240, 0.85);
    font-size: 1rem;
}

.landing-selector {
    display: inline-flex;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.25);
    padding: 0.35rem;
    background: rgba(15, 23, 42, 0.6);
    box-shadow: var(--shadow);
    gap: 0.35rem;
}

.landing-tab {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-weight: 600;
    padding: 0.65rem 1.6rem;
    border-radius: 999px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.landing-tab.active {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.85), rgba(37, 99, 235, 0.85));
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 18px 35px rgba(37, 99, 235, 0.35);
}

.landing-panels {
    width: 100%;
    max-width: 640px;
    display: grid;
}

.landing-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px dashed rgba(148, 163, 184, 0.35);
    box-shadow: var(--shadow);
    padding: 2.5rem 2rem;
    display: grid;
    gap: 1.2rem;
}

.drop-zone {
    border: 2px dashed rgba(59, 130, 246, 0.5);
    border-radius: var(--radius-lg);
    background: rgba(15, 23, 42, 0.35);
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.drop-zone:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

.drop-zone-inner {
    display: grid;
    gap: 0.65rem;
    justify-items: center;
}

.drop-zone:hover,
.drop-zone.is-dragover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.25);
    transform: translateY(-2px);
}

.drop-hint {
    margin: 0;
    color: var(--text-muted);
}

.landing-footnote {
    margin: 0;
    font-size: 0.9rem;
    color: rgba(148, 163, 184, 0.85);
}

.landing-url-label {
    font-weight: 600;
    justify-self: flex-start;
}

.landing-url-field {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.75rem;
}

.landing-url-field input[type="url"] {
    width: 100%;
    padding: 0.9rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.4);
    background: rgba(15, 23, 42, 0.65);
    color: var(--text);
}

.landing-url-field input[type="url"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.landing-status {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.landing-status[data-status="success"] {
    color: var(--success-color, #22c55e);
}

.landing-status[data-status="error"] {
    color: var(--danger);
}

.landing-status[data-status="info"] {
    color: rgba(226, 232, 240, 0.85);
}

.landing.is-loading {
    pointer-events: none;
    opacity: 0.85;
}

.landing.is-loading .landing-status {
    pointer-events: auto;
    opacity: 1;
}

.editor-shell {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.75rem 2.25rem 1.25rem;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.85), rgba(37, 99, 235, 0.8));
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(12px);
}

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

.brand-badge {
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: rgba(15, 23, 42, 0.35);
    border: 1px solid rgba(148, 163, 184, 0.25);
    font-weight: 700;
    letter-spacing: 0.1em;
}

.brand-text strong {
    font-size: 1.2rem;
    display: block;
}

.brand-text small {
    color: rgba(226, 232, 240, 0.75);
    font-size: 0.85rem;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.upload-button {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    border: 1px solid rgba(226, 232, 240, 0.4);
    padding: 0.75rem 1.3rem;
    cursor: pointer;
    font-weight: 600;
    background: rgba(15, 23, 42, 0.35);
    color: var(--text);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.upload-button input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-button:hover {
    transform: translateY(-1px);
    border-color: rgba(226, 232, 240, 0.65);
    box-shadow: 0 18px 35px rgba(15, 23, 42, 0.4);
}

.workspace {
    flex: 1;
    padding: 2.5rem 2.25rem 3.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 1.8rem;
    backdrop-filter: blur(6px);
}

.how-to {
    display: grid;
    gap: 1rem;
}

.how-to-header h2 {
    margin: 0;
    font-size: 1.4rem;
}

.how-to-header p {
    color: var(--text-muted);
    margin: 0.25rem 0 0;
}

.how-to ol {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.how-to li {
    margin-bottom: 0.45rem;
}

.board-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
}

.edit-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.edit-panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.25rem;
}

.edit-panel-header h3 {
    margin: 0;
    font-size: 1.3rem;
}

.edit-panel-header p {
    margin: 0.35rem 0 0;
    color: var(--text-muted);
}

.edit-panel-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.board {
    display: flex;
    flex-direction: column;
    min-height: 320px;
}

.board-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.board-header-main {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.board-header-title {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 0;
}

.board-header h3 {
    margin: 0;
    font-size: 1.2rem;
}

.board-header small {
    color: var(--text-muted);
}

.board-search {
    min-width: 160px;
}

.board-search input[type="search"] {
    width: 100%;
    padding: 0.55rem 0.85rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.3);
    background: rgba(15, 23, 42, 0.65);
    color: var(--text);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.board-search input[type="search"]:focus {
    outline: none;
    border-color: rgba(59, 130, 246, 0.65);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.board-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 0;
}

.board-body .list-content {
    display: grid;
    gap: 0.75rem;
    align-content: flex-start;
    grid-auto-rows: minmax(0, auto);
}

.empty-state {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
    background: rgba(15, 23, 42, 0.45);
    border-radius: var(--radius-md);
    border: 1px dashed rgba(148, 163, 184, 0.2);
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    width: 100%;
}

.pagination-inline {
    justify-content: flex-start;
    margin-top: 0.1rem;
}

.pagination-button {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.3);
    background: rgba(15, 23, 42, 0.65);
    color: var(--text);
    display: grid;
    place-items: center;
    font-size: 0.95rem;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
}

.pagination-button:hover:not(:disabled),
.pagination-button:focus-visible:not(:disabled) {
    border-color: rgba(59, 130, 246, 0.55);
    color: rgba(226, 232, 240, 0.95);
    background: rgba(30, 41, 59, 0.85);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.pagination-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
}

.pagination-info {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 0 0.75rem;
    white-space: nowrap;
}

.pagination-compact {
    gap: 0.35rem;
}

.pagination-compact .pagination-button {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
}

.pagination-compact .pagination-info {
    font-size: 0.75rem;
    padding: 0 0.5rem;
}

.group-card {
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, rgba(21, 32, 55, 0.95), rgba(13, 27, 53, 0.85));
    border: 1px solid transparent;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
    cursor: pointer;
}

.group-card:hover {
    transform: translateY(-2px);
    border-color: rgba(59, 130, 246, 0.45);
    box-shadow: 0 15px 35px rgba(15, 23, 42, 0.45);
}

.group-card.active {
    border-color: rgba(59, 130, 246, 0.85);
    box-shadow: 0 18px 40px rgba(59, 130, 246, 0.25);
}

.group-card.is-selected {
    border-color: rgba(129, 140, 248, 0.6);
}

.group-card h4 {
    margin: 0;
    font-size: 0.95rem;
}

.group-card small {
    color: var(--text-muted);
}

.group-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.group-logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(148, 163, 184, 0.25);
    display: grid;
    place-items: center;
    overflow: hidden;
    flex-shrink: 0;
}

.group-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.group-logo span {
    font-weight: 600;
    font-size: 0.95rem;
    color: rgba(226, 232, 240, 0.75);
}

.group-meta {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.group-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.icon-button {
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.35rem 0.65rem;
    background: rgba(59, 130, 246, 0.18);
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.icon-button:hover {
    background: rgba(59, 130, 246, 0.35);
    transform: translateY(-1px);
}

.icon-button.neutral {
    background: rgba(148, 163, 184, 0.16);
    color: var(--text);
}

.icon-button.neutral:hover {
    background: rgba(148, 163, 184, 0.28);
}

.icon-button.danger {
    background: rgba(239, 68, 68, 0.12);
    color: var(--danger);
}

.icon-button.danger:hover {
    background: rgba(239, 68, 68, 0.25);
}

.primary-button,
.ghost-button,
.danger-button {
    border: none;
    border-radius: var(--radius-md);
    padding: 0.65rem 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.primary-button {
    background: var(--primary);
    color: #0b1120;
}

.primary-button:hover:enabled {
    background: var(--primary-strong);
    box-shadow: 0 18px 35px rgba(37, 99, 235, 0.45);
    transform: translateY(-1px);
}

.primary-button:disabled,
.ghost-button:disabled,
.danger-button:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

.ghost-button {
    background: rgba(148, 163, 184, 0.18);
    color: var(--text);
}

.ghost-button:hover:enabled {
    background: rgba(148, 163, 184, 0.28);
    transform: translateY(-1px);
}

.danger-button {
    background: rgba(239, 68, 68, 0.18);
    color: var(--danger);
}

.danger-button:hover:enabled {
    background: rgba(239, 68, 68, 0.28);
    transform: translateY(-1px);
}

.preview-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.preview-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.preview-header h3 {
    margin: 0;
}

.preview-panel textarea {
    width: 100%;
    min-height: 180px;
    background: transparent;
    border: none;
    border-radius: 0;
    color: var(--text);
    padding: 0;
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
}

.preview-panel textarea:focus {
    outline: none;
    box-shadow: none;
}

.preview-panel textarea.flash {
    animation: flash 1.2s ease;
}

@keyframes flash {
    0% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
    }
    50% {
        box-shadow: 0 0 0 12px rgba(59, 130, 246, 0);
    }
    100% {
        box-shadow: none;
    }
}

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

@media (max-width: 768px) {
    .landing {
        padding: 2.5rem 1rem 1.5rem;
        gap: 2rem;
    }

    .landing-topbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .landing-card {
        padding: 1.75rem 1.25rem;
    }

    .landing-url-field {
        grid-template-columns: 1fr;
    }

    .drop-zone {
        min-height: 180px;
    }

    .edit-panel-header {
        flex-direction: column;
        align-items: stretch;
    }

    .edit-panel-actions {
        justify-content: flex-start;
    }

    .edit-panel-actions .primary-button {
        width: 100%;
    }
}

.modal[hidden] {
    display: none;
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.85);
    display: grid;
    place-items: center;
    padding: 2rem;
    z-index: 20;
    backdrop-filter: blur(4px);
}

.modal-card {
    width: min(640px, 100%);
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 2rem;
    display: grid;
    gap: 1.25rem;
}

.modal-card header h2 {
    margin: 0 0 0.25rem;
}

.modal-card header p {
    margin: 0;
    color: var(--text-muted);
}

.modal-card textarea {
    width: 100%;
    border-radius: var(--radius-md);
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(148, 163, 184, 0.25);
    color: var(--text);
    padding: 1rem;
    min-height: 260px;
    font-family: "JetBrains Mono", "Fira Code", monospace;
}

.modal-card textarea:focus {
    outline: none;
    border-color: rgba(59, 130, 246, 0.65);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.modal-card.modal-large {
    width: min(920px, 100%);
}

.dual-lists {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.dual-column {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.dual-column h3 {
    margin: 0;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    color: var(--text);
}

.dual-column h3 span {
    font-size: 0.85rem;
    color: var(--text-muted);
    background: rgba(148, 163, 184, 0.14);
    border-radius: 999px;
    padding: 0.2rem 0.6rem;
}

.dual-list-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.dual-list {
    display: grid;
    gap: 0.75rem;
}

.dual-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.85rem;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.dual-item .dual-info {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex: 1;
    min-width: 0;
}

.dual-info strong {
    display: block;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dual-info small {
    color: var(--text-muted);
    font-size: 0.8rem;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.channel-thumb {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: rgba(15, 23, 42, 0.45);
    display: grid;
    place-items: center;
    overflow: hidden;
    flex-shrink: 0;
}

.channel-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.channel-thumb span {
    font-weight: 600;
    font-size: 0.9rem;
    color: rgba(226, 232, 240, 0.75);
}

.dual-item .icon-button {
    flex-shrink: 0;
}

.empty-state.small {
    padding: 1.5rem 1rem;
    font-size: 0.95rem;
}

@media (max-width: 960px) {
    .topbar {
        flex-direction: column;
        gap: 1.25rem;
        align-items: flex-start;
    }

    .topbar-actions {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .workspace {
        padding: 1.75rem 1.5rem 3rem;
    }

}

@media (max-width: 640px) {
    .workspace {
        padding: 1.5rem 1rem 2.5rem;
    }

    .card {
        padding: 1.35rem;
    }

    .board-grid {
        grid-template-columns: 1fr;
    }

    .topbar {
        padding: 1.5rem 1.25rem 1rem;
    }

    .preview-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .dual-lists {
        grid-template-columns: 1fr;
    }
}

.upload-progress[hidden] {
    display: none !important;
}

.upload-progress {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    width: min(320px, calc(100% - 2rem));
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg);
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: 0 24px 48px rgba(15, 23, 42, 0.35);
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 2000;
}

.upload-progress-bar {
    position: relative;
    height: 8px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.25);
    overflow: hidden;
}

.upload-progress-fill {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 0%;
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.85), rgba(59, 130, 246, 0.45));
    border-radius: inherit;
    transition: width 0.25s ease;
}

.upload-progress.is-indeterminate .upload-progress-fill {
    width: 40%;
    animation: upload-progress-indeterminate 1.4s ease-in-out infinite;
}

.upload-progress-label {
    font-size: 0.9rem;
    color: rgba(226, 232, 240, 0.9);
}

@keyframes upload-progress-indeterminate {
    0% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(150%);
    }
    100% {
        transform: translateX(150%);
    }
}