:root {
    --primary: #a7a8fa;
    --primary-dark: #857eff;
    --surface: #2e2e2e;
    --surface-muted: rgba(37, 37, 37, 0.82);
    --text: #cacaca;
    --text-light: #a9a9a9;
    --border: rgba(99, 102, 241, 0.18);
    --shadow: 0 20px 50px rgba(15, 23, 42, 0.18);
    --radius-lg: 20px;
}

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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: radial-gradient(circle at 20% 20%, #434343 0%, #464646 45%, #202020 100%);
    color: var(--text);
    min-height: 100vh;
    padding: 40px 24px 64px;
    line-height: 1.5;
    scroll-behavior: smooth;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
}

.app-shell {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    gap: 32px;
    align-items: flex-start;
}

.sidebar {
    position: sticky;
    top: 32px;
    width: 264px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 28px;
    background: var(--surface-muted);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: var(--radius-lg);
    box-shadow: 0 18px 45px rgba(99, 102, 241, 0.14);
    backdrop-filter: blur(12px);
}

.sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-logo {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--primary-dark);
    letter-spacing: 0.02em;
}

.sidebar-intro {
    font-size: 0.9em;
    color: var(--text-light);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    color: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.nav-link:hover {
    border-color: rgba(99, 102, 241, 0.28);
    background: rgba(99, 102, 241, 0.08);
}

.nav-link.active {
    border-color: rgba(99, 102, 241, 0.55);
    background: rgba(99, 102, 241, 0.18);
    color: var(--primary-dark);
    box-shadow: 0 12px 28px rgba(99, 102, 241, 0.18);
}

.nav-index {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8em;
    font-weight: 600;
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-dark);
}

.sidebar-tips {
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px dashed rgba(99, 102, 241, 0.4);
    font-size: 0.85em;
    color: var(--text-light);
    line-height: 1.4;
}

.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.hero {
    position: relative;
    overflow: hidden;
    padding: 44px;
    border-radius: calc(var(--radius-lg) + 4px);
    background: linear-gradient(130deg, rgba(64, 66, 153, 0.95) 0%, rgba(42, 69, 144, 0.85) 60%, rgba(75, 48, 103, 0.92) 100%);
    color: #e2e2e2;
    box-shadow: var(--shadow);
}

.hero::after {
    content: "";
    position: absolute;
    inset: -20% 40% auto -40%;
    height: 140%;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.35) 0%, transparent 60%);
    opacity: 0.55;
}

.hero-text {
    position: relative;
    z-index: 1;
    max-width: 620px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85em;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.18);
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
}

.hero-title {
    font-size: 2.3em;
    line-height: 1.2;
    font-weight: 700;
}

.hero-description {
    font-size: 1em;
    color: rgba(249, 250, 251, 0.92);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.hero-btn {
    border: none;
    border-radius: 999px;
    padding: 12px 24px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.hero-btn.primary {
    background: #0f172a;
    color: #e0e0e0;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.25);
}

.hero-btn.primary:hover {
    transform: translateY(-2px);
}

.hero-btn.secondary {
    background: rgba(15, 23, 42, 0.18);
    color: #f9fafb;
}

.hero-btn.secondary:hover {
    background: rgba(15, 23, 42, 0.28);
}

.content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

[data-nav-section] {
    scroll-margin-top: 96px;
}

.section {
    background: var(--surface);
    border-radius: calc(var(--radius-lg) + 2px);
    padding: 32px 36px;
    border: 1px solid var(--border);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.section-heading {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}

.section-title-wrap {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.section-desc {
    font-size: 0.9em;
    color: var(--text-light);
}

.step-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.75em;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-dark);
}

.step-badge.muted {
    background: rgba(148, 163, 184, 0.18);
    color: var(--text-light);
}

.section h2 {
    font-size: 1.28em;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.collapsible {
    cursor: pointer;
    user-select: none;
}

.collapsible-label {
    display: flex;
    align-items: center;
    gap: 14px;
}

.collapsible-title {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.collapsible-title small {
    font-size: 0.8em;
    font-weight: 400;
    color: var(--text-light);
}

.collapse-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: rgba(99, 102, 241, 0.12);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85em;
    color: var(--primary-dark);
    transition: transform 0.25s ease;
}

.collapsible.collapsed .collapse-icon {
    transform: rotate(-90deg);
}

.collapse-content {
    border-top: 1px dashed rgba(148, 163, 184, 0.35);
    padding-top: 24px;
    display: grid;
    gap: 24px;
}

.collapse-content.collapsed {
    display: none;
}

.section h3 {
    color: var(--text);
    font-size: 1.1em;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

label {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text);
    margin: 10px 0 0 0;
    display: block;
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(98, 98, 98, 0.45);
    border-radius: 12px;
    background: rgba(85, 85, 85, 0.15);
    font-size: 0.95em;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    font-family: inherit;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.6);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.18);
    background: #2e2e2e;
}

textarea {
    min-height: 180px;
    resize: none;
    overflow: hidden;
    field-sizing: content;
}

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

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.5);
    background: rgba(44, 44, 44, 0.92);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.checkbox-item:hover {
    border-color: rgba(99, 102, 241, 0.45);
    box-shadow: 0 12px 25px rgba(99, 102, 241, 0.12);
    transform: translateY(-1px);
}

.checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-item label {
    margin: 0;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    flex: 1;
    display: inline;
}

.character-card,
.variable-card {
    background: rgba(71, 71, 71, 0.15);
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.4);
    padding: 24px;
    display: grid;
    gap: 22px;
}

.variable-card {
    grid-template-columns: minmax(180px, 240px) 1fr auto;
    align-items: start;
}

.variable-card .form-group {
    gap: 10px;
}

.variable-card .variable-name-group {
    min-width: 0;
}

.variable-card textarea {
    min-height: 160px;
}

.variable-card .remove-btn-container {
    display: flex;
    align-items: flex-start;
}

.add-character-btn {
    align-self: flex-start;
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: 999px;
    padding: 10px 22px;
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-dark);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.add-character-btn:hover {
    background: rgba(99, 102, 241, 0.22);
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(99, 102, 241, 0.2);
}

.add-character-btn.success {
    background: rgba(34, 197, 94, 0.16);
    color: #047857;
    border-color: rgba(34, 197, 94, 0.28);
}

.add-character-btn.success:hover {
    background: rgba(34, 197, 94, 0.26);
    color: #04543c;
    box-shadow: 0 12px 22px rgba(34, 197, 94, 0.22);
}

.add-character-btn.danger {
    background: rgba(239, 68, 68, 0.16);
    color: #b91c1c;
    border-color: rgba(239, 68, 68, 0.28);
}

.add-character-btn.danger:hover {
    background: rgba(239, 68, 68, 0.26);
    color: #991b1b;
    box-shadow: 0 12px 22px rgba(239, 68, 68, 0.22);
}

.remove-character-btn {
    background: #ef4444;
    color: #e0e0e0;
    border: none;
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 0.85em;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.remove-character-btn:hover {
    background: #dc2626;
}

.action-buttons {
    position: sticky;
    bottom: 24px;
    z-index: 10;
    border-radius: 18px;
    padding: 18px;
    background: rgb(43 43 43 / 96%);
    border: 1px solid rgba(148, 163, 184, 0.3);
    box-shadow: 0 18px 35px rgba(15, 23, 42, 0.12);
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: flex-end;
}

.btn {
    border: none;
    border-radius: 14px;
    padding: 13px 28px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: #e0e0e0;
    box-shadow: 0 14px 30px rgba(79, 70, 229, 0.35);
}

.btn-secondary {
    background: rgba(99, 102, 241, 0.12);
    color: var(--primary-dark);
}

.btn-secondary:hover {
    background: rgba(99, 102, 241, 0.22);
}

.placeholder-text {
    color: var(--text-light);
    font-size: 0.85em;
}

.mode-toggle-container {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 16px;
}

.mode-toggle-btn {
    padding: 6px 14px;
    border-radius: 8px;
    border: 1px solid rgba(99, 102, 241, 0.3);
    background: rgba(248, 250, 252, 0.15);
    color: var(--text);
    font-size: 0.85em;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-toggle-btn:hover {
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(99, 102, 241, 0.08);
}

.mode-toggle-btn.active {
    background: rgba(99, 102, 241, 0.18);
    border-color: rgba(99, 102, 241, 0.6);
    color: var(--primary-dark);
    font-weight: 600;
}

.simple-mode, .detailed-mode {
    display: none;
}

.simple-mode.active, .detailed-mode.active {
    display: block;
}

@media (max-width: 1100px) {
    .app-shell {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
    }

    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .nav-link {
        flex: 1 1 180px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 24px 16px 48px;
    }

    .hero {
        padding: 32px 24px;
    }

    .section {
        padding: 24px;
    }

    .variable-card {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        position: static;
        justify-content: center;
    }
}

@media (max-width: 540px) {
    .sidebar {
        flex-direction: column;
        align-items: flex-start;
    }

    .sidebar-nav {
        width: 100%;
    }

    .nav-link {
        flex: 1 1 100%;
    }

    .hero-title {
        font-size: 1.85em;
    }

    .content {
        gap: 18px;
    }
}