@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
    --sqr-bg: #FFFBF5;
    --sqr-surface: #FFFFFF;
    --sqr-surface-muted: #F5F0E8;
    --sqr-border: #E9E1D4;
    --sqr-text: #1F1B16;
    --sqr-text-muted: #766C5E;
    --sqr-primary: #C97B3B;
    --sqr-primary-hover: #B36A2E;
    --sqr-primary-soft: #FBE6D1;
    --sqr-accent: #6A8F6B;
    --sqr-danger: #B3302E;
    --sqr-rail-bg: #F5F0E8;
    --sqr-focus: #C97B3B;
}

[data-theme="dark"] {
    --sqr-bg: #1A1612;
    --sqr-surface: #24201B;
    --sqr-surface-muted: #2E2823;
    --sqr-border: #3B352E;
    --sqr-text: #F4EEE3;
    --sqr-text-muted: #A89E8D;
    --sqr-primary: #E39257;
    --sqr-primary-hover: #F5A269;
    --sqr-primary-soft: #3D2A1C;
    --sqr-accent: #8FB48D;
    --sqr-danger: #D95250;
    --sqr-rail-bg: #201C17;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--sqr-bg);
    color: var(--sqr-text);
    min-height: 100vh;
}

.sqr-app {
    display: grid;
    grid-template-columns: 72px 260px 1fr;
    min-height: 100vh;
}

.sqr-icon-rail {
    background: var(--sqr-rail-bg);
    border-right: 1px solid var(--sqr-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
    gap: 8px;
}

.sqr-icon-rail__logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--sqr-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 20px;
}

.sqr-icon-rail__btn {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sqr-text-muted);
    text-decoration: none;
    transition: background 120ms ease, color 120ms ease;
}

.sqr-icon-rail__btn:hover {
    background: var(--sqr-primary-soft);
    color: var(--sqr-primary);
}

.sqr-icon-rail__btn.active {
    background: var(--sqr-primary);
    color: #fff;
}

.sqr-sidebar {
    background: var(--sqr-surface);
    border-right: 1px solid var(--sqr-border);
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sqr-sidebar__title {
    height: 40px;
    margin-bottom: 20px;
    padding: 0 12px;
    display: flex;
    align-items: center;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--sqr-text-muted);
}

.sqr-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 44px;
    padding: 0 12px;
    border-radius: 8px;
    color: var(--sqr-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.sqr-nav-link:hover { background: var(--sqr-surface-muted); }

.sqr-nav-link.active {
    background: var(--sqr-primary-soft);
    color: var(--sqr-primary);
    font-weight: 600;
}

.sqr-main {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.sqr-header {
    background: var(--sqr-surface);
    border-bottom: 1px solid var(--sqr-border);
    padding: 12px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.sqr-header__title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.sqr-header__actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.sqr-content {
    padding: 32px;
    flex: 1;
    max-width: 1200px;
    width: 100%;
}

.sqr-card {
    background: var(--sqr-surface);
    border: 1px solid var(--sqr-border);
    border-radius: 12px;
    padding: 24px;
}

.sqr-card__title {
    margin: 0 0 16px 0;
    font-size: 16px;
    font-weight: 600;
}

.sqr-grid {
    display: grid;
    gap: 16px;
}

.sqr-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 8px;
    padding: 10px 16px;
    font: 500 14px/1 'DM Sans', sans-serif;
    border: 1px solid transparent;
    cursor: pointer;
    background: var(--sqr-surface-muted);
    color: var(--sqr-text);
    text-decoration: none;
    transition: background 120ms ease, transform 120ms ease;
}

.sqr-btn:hover { background: var(--sqr-border); }

.sqr-btn--primary { background: var(--sqr-primary); color: #fff; border-color: var(--sqr-primary); }
.sqr-btn--primary:hover { background: var(--sqr-primary-hover); border-color: var(--sqr-primary-hover); }

.sqr-btn--ghost { background: transparent; border: 1px solid var(--sqr-border); }

.sqr-input, .sqr-select, .sqr-textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--sqr-border);
    background: var(--sqr-surface);
    color: var(--sqr-text);
    font: 400 14px 'DM Sans', sans-serif;
}

.sqr-input:focus, .sqr-select:focus, .sqr-textarea:focus {
    outline: 2px solid var(--sqr-primary);
    outline-offset: 1px;
    border-color: transparent;
}

.sqr-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--sqr-text-muted);
}

.sqr-login {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.sqr-login__card {
    width: 100%;
    max-width: 400px;
    padding: 40px 32px;
    background: var(--sqr-surface);
    border: 1px solid var(--sqr-border);
    border-radius: 14px;
}

.sqr-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    background: var(--sqr-primary-soft);
    color: var(--sqr-primary);
}

.sqr-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.sqr-table th, .sqr-table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--sqr-border);
}

.sqr-table th {
    font-weight: 600;
    color: var(--sqr-text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.sqr-landing {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(180deg, var(--sqr-bg) 0%, var(--sqr-surface-muted) 100%);
}

.sqr-landing__card {
    width: 100%;
    max-width: 420px;
    padding: 32px 24px;
    background: var(--sqr-surface);
    border: 1px solid var(--sqr-border);
    border-radius: 14px;
    text-align: center;
}

.sqr-alert {
    padding: 12px 14px;
    border-radius: 8px;
    background: var(--sqr-primary-soft);
    color: var(--sqr-primary);
    font-size: 14px;
}

.sqr-alert--danger { background: rgba(179, 48, 46, 0.1); color: var(--sqr-danger); }

.blazor-error-boundary {
    padding: 16px;
    background: rgba(179, 48, 46, 0.1);
    color: var(--sqr-danger);
    border-radius: 8px;
    margin: 16px;
}

#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 16px;
    right: 16px;
    padding: 12px 16px;
    background: var(--sqr-danger);
    color: #fff;
    border-radius: 8px;
    z-index: 1000;
}

.validation-message { color: var(--sqr-danger); font-size: 13px; }

@media (max-width: 900px) {
    .sqr-app { grid-template-columns: 64px 1fr; }
    .sqr-sidebar { display: none; }
    .sqr-content { padding: 16px; }
}

/* ========== Library (tree + detail) ========== */
.sqr-library {
    display: flex;
    align-items: stretch;
    gap: 0;
    min-height: calc(100vh - 160px);
    border: 1px solid var(--sqr-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--sqr-surface);
}

.sqr-library__tree {
    flex: 0 0 340px;
    min-width: 280px;
    max-width: 600px;
    overflow-y: auto;
    padding: 12px;
    background: var(--sqr-surface);
    border-right: 1px solid var(--sqr-border);
}

.sqr-library__resizer {
    flex: 0 0 6px;
    cursor: col-resize;
    background: transparent;
    border-left: 1px solid var(--sqr-border);
    border-right: 1px solid var(--sqr-border);
    position: relative;
}
.sqr-library__resizer:hover { background: var(--sqr-primary-soft); }

.sqr-library__detail {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 20px 24px;
    background: var(--sqr-bg);
}

.sqr-tree-search {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 8px;
    background: var(--sqr-surface-muted);
    border-radius: 8px;
    margin-bottom: 8px;
}
.sqr-tree-search input {
    border: none;
    background: transparent;
    outline: none;
    flex: 1;
    color: var(--sqr-text);
    font-size: 14px;
}
.sqr-tree-search button {
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--sqr-text-muted);
    padding: 2px 6px;
    border-radius: 4px;
}
.sqr-tree-search button:hover { color: var(--sqr-text); background: var(--sqr-border); }

.sqr-tree-node {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
    min-height: 32px;
    color: var(--sqr-text);
    font-size: 14px;
}
.sqr-tree-node:hover { background: var(--sqr-surface-muted); }
.sqr-tree-node.is-selected { background: var(--sqr-primary-soft); color: var(--sqr-primary); font-weight: 600; }
.sqr-tree-node.is-drop-target {
    outline: 2px dashed var(--sqr-primary);
    outline-offset: -2px;
}
.sqr-tree-node__icon { font-size: 16px; width: 20px; text-align: center; color: #f59e0b; flex-shrink: 0; }
.sqr-tree-node__icon--item { color: var(--sqr-accent); }
.sqr-tree-node__label { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sqr-tree-node__chip {
    background: var(--sqr-surface-muted);
    color: var(--sqr-text-muted);
    border-radius: 10px;
    padding: 1px 8px;
    font-size: 11px;
    font-weight: 600;
}
.sqr-tree-node.is-selected .sqr-tree-node__chip { background: rgba(255,255,255,0.25); color: var(--sqr-primary); }
.sqr-tree-node__dots {
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--sqr-text-muted);
    font-size: 16px;
    padding: 0 4px;
    border-radius: 4px;
    opacity: 0;
}
.sqr-tree-node:hover .sqr-tree-node__dots { opacity: 1; }
.sqr-tree-node__dots:hover { color: var(--sqr-text); background: var(--sqr-border); }

.sqr-tree-children { padding-left: 20px; }

.sqr-summary-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    color: var(--sqr-text);
    text-align: left;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
}
.sqr-summary-btn:hover { background: var(--sqr-surface-muted); }
.sqr-summary-btn.is-selected { background: var(--sqr-primary-soft); color: var(--sqr-primary); font-weight: 600; }

.sqr-site-title {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 8px;
}
.sqr-site-title button {
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--sqr-text-muted);
    opacity: 0;
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 12px;
}
.sqr-site-title:hover button { opacity: 1; }
.sqr-site-title button:hover { color: var(--sqr-text); background: var(--sqr-border); }

/* Context menu */
.sqr-context-menu {
    position: fixed;
    min-width: 200px;
    background: var(--sqr-surface);
    border: 1px solid var(--sqr-border);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    padding: 4px;
    z-index: 1001;
}
.sqr-context-menu__item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--sqr-text);
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
}
.sqr-context-menu__item:hover { background: var(--sqr-surface-muted); }
.sqr-context-menu__item--danger { color: var(--sqr-danger); }
.sqr-context-menu__sep { height: 1px; background: var(--sqr-border); margin: 4px 0; }
.sqr-context-menu__backdrop {
    position: fixed; inset: 0;
    background: transparent;
    z-index: 1000;
}

/* Modal */
.sqr-modal__backdrop {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex; align-items: center; justify-content: center;
    z-index: 2000;
}
.sqr-modal {
    background: var(--sqr-surface);
    border: 1px solid var(--sqr-border);
    border-radius: 12px;
    padding: 20px;
    min-width: 360px;
    max-width: 520px;
    box-shadow: 0 16px 48px rgba(0,0,0,0.3);
}
.sqr-modal__title { font-weight: 600; font-size: 16px; margin-bottom: 12px; }
.sqr-modal__actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }

/* Toast */
.sqr-toast-stack {
    position: fixed;
    bottom: 20px; right: 20px;
    display: flex; flex-direction: column; gap: 8px;
    z-index: 3000;
}
.sqr-toast {
    background: var(--sqr-surface);
    border: 1px solid var(--sqr-border);
    border-left: 4px solid var(--sqr-accent);
    border-radius: 8px;
    padding: 10px 14px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.18);
    font-size: 14px;
    min-width: 200px;
}
.sqr-toast--error { border-left-color: var(--sqr-danger); }

@media (max-width: 720px) {
    .sqr-library { flex-direction: column; }
    .sqr-library__tree { flex: 1 1 auto; width: 100%; max-width: none; min-width: 0; border-right: none; border-bottom: 1px solid var(--sqr-border); }
    .sqr-library__resizer { display: none; }
    .sqr-tree-node__dots { opacity: 1; }
}