:root {
    --page: #f4f7fb;
    --surface: rgba(255, 255, 255, 0.9);
    --surface-strong: #ffffff;
    --surface-soft: #f7f9fd;
    --ink: #17212f;
    --muted: #647287;
    --line: rgba(106, 123, 147, 0.18);
    --teal: #0f766e;
    --blue: #315efb;
    --violet: #6b5bff;
    --amber: #d97706;
    --rose: #dc2626;
    --shadow: 0 24px 58px rgba(17, 24, 39, 0.12);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
    --sans: Arial, Helvetica, sans-serif;
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", "Courier New", monospace;
}

html.theme-dark {
    --page: #0b1020;
    --surface: rgba(17, 24, 39, 0.84);
    --surface-strong: #111827;
    --surface-soft: #172033;
    --ink: #e8eef8;
    --muted: #9aa8bb;
    --line: rgba(148, 163, 184, 0.16);
    --teal: #34d1bf;
    --blue: #60a5fa;
    --violet: #8b7dff;
    --amber: #f59e0b;
    --rose: #fb7185;
    --shadow: 0 26px 70px rgba(0, 0, 0, 0.34);
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: var(--sans);
    background:
        radial-gradient(circle at 14% 10%, rgba(15, 118, 110, 0.14), transparent 26%),
        radial-gradient(circle at 88% 8%, rgba(49, 94, 251, 0.14), transparent 24%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(244, 247, 251, 0.96)),
        var(--page);
}
html.theme-dark body {
    background:
        radial-gradient(circle at 14% 10%, rgba(52, 209, 191, 0.12), transparent 26%),
        radial-gradient(circle at 88% 8%, rgba(96, 165, 250, 0.12), transparent 24%),
        linear-gradient(180deg, rgba(11, 16, 32, 0.96), rgba(15, 23, 42, 0.98)),
        var(--page);
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }

.app-shell {
    width: min(1540px, calc(100% - 28px));
    margin: 0 auto;
    padding: 18px 0 36px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow);
    margin-bottom: 18px;
}
html.theme-dark .topbar { background: rgba(17, 24, 39, 0.88); }
.topbar-inner {
    min-height: 72px;
    padding: 0 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    position: relative;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 900;
    min-width: 0;
    flex: 0 1 auto;
}
.brand-logo {
    display: block;
    width: clamp(140px, 22vw, 220px);
    max-width: 100%;
    height: auto;
    max-height: 40px;
    flex: 0 0 auto;
}
.brand-mark {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    color: #fff;
    background: linear-gradient(135deg, var(--teal), var(--blue));
    font-family: var(--mono);
    font-size: 0.88rem;
}
.brand-copy { display: grid; gap: 2px; }
.brand-copy strong { font-size: 1rem; }
.brand-copy span { color: var(--muted); font-size: 0.82rem; font-weight: 800; }

.primary-nav {
    margin-left: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    min-width: 0;
    flex: 0 1 auto;
    justify-content: flex-start;
}
.nav-item { position: relative; }
.nav-link, .nav-trigger {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--muted);
    background: transparent;
    font-weight: 800;
}
.nav-link:hover, .nav-trigger:hover, .nav-item.open > .nav-trigger {
    color: var(--ink);
    border-color: var(--line);
    background: var(--surface-soft);
}
.nav-trigger i { font-size: 0.75rem; transition: transform 0.18s ease; }
.nav-item.open .nav-trigger i, .nav-item:hover .nav-trigger i { transform: rotate(180deg); }
.dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    z-index: 60;
    min-width: 320px;
    padding: 6px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(255,255,255,0.98);
    box-shadow: 0 24px 48px rgba(17, 24, 39, 0.16);
    display: grid;
    gap: 3px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}
html.theme-dark .dropdown-menu { background: rgba(17, 24, 39, 0.98); }
.nav-item.open .dropdown-menu, .nav-item:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu a {
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 0.86rem;
    font-weight: 800;
    color: var(--muted);
}
.dropdown-menu a:hover, .dropdown-menu a[aria-current="page"] { color: var(--ink); background: var(--surface-soft); }

.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}
.header-search {
    flex: 0 1 auto;
}
.header-search {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 12px;
    min-height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
}
.header-search input {
    width: min(280px, 36vw);
    border: 0;
    outline: none;
    background: transparent;
    color: var(--ink);
}
.search-submit, .theme-toggle, .action-button, .ghost-button {
    min-height: 44px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
    color: var(--ink);
    font-weight: 800;
}
.menu-toggle {
    width: 46px;
    min-height: 44px;
    padding: 0;
    display: none;
    align-items: center;
    justify-content: center;
    position: relative;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
    color: var(--ink);
}

.menu-toggle span {
    position: absolute;
    width: 20px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition: transform 0.18s ease, opacity 0.18s ease;
}

.menu-toggle span:nth-child(1) { transform: translateY(-6px); }
.menu-toggle span:nth-child(3) { transform: translateY(6px); }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: rotate(-45deg); }
.theme-toggle, .action-button { box-shadow: 0 12px 24px rgba(17, 24, 39, 0.08); }

@media (max-width: 1320px) {
    .topbar-inner {
        flex-wrap: wrap;
    }

    .primary-nav {
        flex: 1 1 100%;
        margin-left: 0;
        order: 3;
        width: 100%;
        justify-content: flex-start;
    }

    .header-actions {
        width: 100%;
        margin-left: 0;
        order: 4;
        justify-content: flex-end;
        flex-wrap: wrap;
        gap: 12px;
    }

    .header-search {
        min-width: min(100%, 280px);
        flex: 1 1 280px;
    }
}

.page {
    display: grid;
    gap: 18px;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.75fr);
    gap: 18px;
    align-items: start;
}
.hero-card, .side-card, .panel, .toolbox, .note-card {
    border: 1px solid var(--line);
    background: var(--surface);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
}
.hero-card {
    border-radius: var(--radius-xl);
    padding: 22px 24px;
    position: relative;
    overflow: hidden;
}
.hero-card::before {
    content: "";
    position: absolute;
    inset: -80px auto auto -90px;
    width: 230px;
    height: 230px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(15,118,110,0.22), transparent 68%);
    pointer-events: none;
}
.eyebrow {
    margin: 0 0 6px;
    color: var(--teal);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.78rem;
    font-weight: 900;
}
.hero h1 {
    margin: 0;
    font-size: clamp(1.9rem, 4vw, 3.8rem);
    line-height: 0.98;
}
.hero-copy {
    margin: 10px 0 0;
    max-width: 68ch;
    color: var(--muted);
    line-height: 1.55;
}
.hero-stats {
    margin-top: 16px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}
.stat {
    padding: 12px 14px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(255,255,255,0.65), rgba(247,249,253,0.96));
}
html.theme-dark .stat { background: linear-gradient(180deg, rgba(23,32,51,0.76), rgba(17,24,39,0.92)); }
.stat strong { display: block; font-size: 1.35rem; }
.stat span { color: var(--muted); font-size: 0.82rem; font-weight: 800; }

.side-card {
    border-radius: var(--radius-xl);
    padding: 22px;
    display: grid;
    gap: 14px;
}
.side-card h2, .side-card h3, .panel h2, .panel h3, .toolbox h3 { margin: 0; }
.side-card p { margin: 0; color: var(--muted); line-height: 1.6; }
.side-actions {
    display: grid;
    gap: 10px;
}
.side-actions label {
    display: grid;
    gap: 8px;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 800;
}
.side-actions input, .side-actions select, .inline-input {
    width: 100%;
    min-height: 46px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
    color: var(--ink);
}
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.inline-input[type="checkbox"] {
    width: auto;
    min-width: 18px;
    height: 18px;
    accent-color: var(--teal);
}

.toolbox {
    border-radius: var(--radius-xl);
    padding: 16px;
}
.toolbox-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}
.panel, .note-card {
    border-radius: 24px;
    padding: 18px;
}
.panel-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}
.panel-head p { margin: 4px 0 0; color: var(--muted); }

.workspace-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
    gap: 18px;
    align-items: start;
}
.editor-shell {
    min-height: 280px;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--line);
    background: var(--surface-strong);
}
textarea {
    width: 100%;
    min-height: 280px;
    resize: vertical;
    padding: 18px;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--ink);
    line-height: 1.65;
    font-family: var(--mono);
}
.output-box { min-height: 280px; }
.editor-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 900;
}
.badge.primary { background: rgba(49,94,251,0.12); color: var(--blue); }
.badge.accent { background: rgba(15,118,110,0.12); color: var(--teal); }
.badge.warning { background: rgba(217,119,6,0.12); color: var(--amber); }

.controls {
    display: grid;
    gap: 12px;
}
.control {
    display: grid;
    gap: 8px;
}
.control label {
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 800;
}
.control input, .control select {
    min-height: 46px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
    color: var(--ink);
}
.switches {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.switch {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
    color: var(--ink);
    font-weight: 800;
    font-size: 0.9rem;
}
.switch input { accent-color: var(--teal); }

.actions-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.primary-button {
    border: 0;
    color: #fff;
    background: linear-gradient(135deg, var(--teal), var(--blue));
}
.danger-button {
    border-color: rgba(220, 38, 38, 0.2);
    color: var(--rose);
    background: rgba(220, 38, 38, 0.06);
}
.ghost-button {
    background: var(--surface-strong);
}
.file-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 46px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-strong);
    font-weight: 800;
}

.summary-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
    align-items: start;
}
.summary-card {
    padding: 14px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--surface-strong);
}
.summary-card span { display: block; color: var(--muted); font-size: 0.82rem; font-weight: 800; }
.summary-card strong { display: block; margin-top: 6px; font-size: 1.18rem; }

.status-bar {
    display: grid;
    gap: 10px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
    box-shadow: var(--shadow);
}
.status-copy {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-weight: 800;
}
.status-light {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--teal);
    box-shadow: 0 0 0 6px rgba(15,118,110,0.12);
}
.progress {
    height: 8px;
    border-radius: 999px;
    background: var(--surface-soft);
    overflow: hidden;
}
.progress span {
    display: block;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--teal), var(--blue));
    transition: width 0.2s ease;
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    align-items: start;
}
.note-card {
    display: grid;
    gap: 12px;
    align-content: start;
}
.note-card p { margin: 0; color: var(--muted); line-height: 1.6; }

.site-footer {
    margin-top: 18px;
    padding: 22px 18px 18px;
    border: 0;
    border-radius: 24px;
    background: linear-gradient(135deg, #cacccc 0%, #d8dada 55%, #eef0f0 100%);
    box-shadow: 0 18px 40px rgba(148, 163, 184, 0.18);
    color: #1f2937;
}
.site-footer__inner {
    display: grid;
    grid-template-columns: minmax(260px, 0.9fr) minmax(0, 1.5fr) minmax(240px, 0.7fr);
    gap: 18px;
    align-items: start;
}
.site-footer__brand p { color: #475569; line-height: 1.6; margin-top: 10px; }
.site-footer__mail { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; color: #0f3bff; }
.site-footer__links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}
.site-footer__group h4 { margin: 0 0 10px; color: #1f2937; }
.site-footer__group ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.site-footer__group a { color: #475569; font-weight: 800; }
.site-footer__group a:hover, .site-footer__group a[aria-current="page"] { color: #0f3bff; }
.site-footer__social p { color: #475569; line-height: 1.6; }
.site-footer__social-row { display: flex; gap: 10px; flex-wrap: wrap; }
.site-footer__social-row a {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    border: 1px solid rgba(15, 59, 255, 0.14);
    background: rgba(15, 59, 255, 0.05);
    color: #0f3bff;
}
.site-footer__social-row a:hover {
    color: #0f3bff;
    border-color: rgba(15, 59, 255, 0.24);
    background: rgba(15, 59, 255, 0.1);
}
.site-footer__bottom {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid rgba(148, 163, 184, 0.22);
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    color: #64748b;
    font-size: 0.92rem;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 1200px) {
    .hero, .workspace-grid, .toolbox-grid, .notes-grid, .site-footer__inner, .summary-row { grid-template-columns: 1fr; }
    .site-footer__links { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
    .primary-nav {
        margin-left: 0;
        width: auto;
        max-width: calc(100vw - 32px);
        max-height: calc(100vh - 96px);
        overflow-y: auto;
        overscroll-behavior: contain;
        box-sizing: border-box;
    }
    .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .site-footer__links { grid-template-columns: 1fr; }
    .brand-logo {
        width: clamp(130px, 34vw, 180px);
        max-height: 36px;
    }
}

@media (max-width: 720px) {
    .app-shell { width: min(100% - 16px, 1540px); }
    .hero-card, .side-card, .panel, .toolbox, .note-card { border-radius: 22px; }
    .hero-card { padding: 20px; }
    .hero-stats { gap: 10px; }
    textarea, .editor-shell { min-height: 240px; }
    .summary-row { grid-template-columns: 1fr 1fr; }
    .actions-row { display: grid; grid-template-columns: 1fr 1fr; }
    .primary-button, .danger-button, .ghost-button, .file-button { width: 100%; justify-content: center; }
    .topbar-inner { padding: 12px 14px; }
    .primary-nav {
        max-width: calc(100vw - 16px);
        max-height: calc(100vh - 88px);
    }
    .brand-logo {
        width: clamp(118px, 44vw, 160px);
        max-height: 32px;
    }
}