:root {
    --primary: #233c65;
    --primary-dark: #162943;
    --bg: #f4f6f9;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --warning-bg: #fff7ed;
    --warning-border: #fed7aa;
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    --error-text: #991b1b;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;
    --success-text: #065f46;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    background: var(--primary);
    color: #fff;
    padding: 18px 0;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-link {
    color: #fff;
    text-decoration: none;
}

.brand {
    font-size: 22px;
    font-weight: 700;
}

.brand-subtitle {
    margin-top: 4px;
    font-size: 13px;
    opacity: 0.85;
}

.main-content {
    padding: 36px 0;
}

.hero-card {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 24px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 32px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.hero-text h1,
.content-card h1,
.workspace-header h1 {
    margin: 0 0 16px;
    font-size: 34px;
    line-height: 1.15;
    color: var(--primary-dark);
}

.hero-text p {
    margin: 0 0 18px;
    font-size: 17px;
    line-height: 1.6;
    color: var(--muted);
}

.muted {
    color: var(--muted);
    line-height: 1.6;
}

.notice {
    padding: 14px 16px;
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 22px;
}

.small-notice {
    font-size: 13px;
    margin-top: 18px;
    margin-bottom: 0;
}

.actions {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-block;
    border: 0;
    cursor: pointer;
    padding: 12px 18px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 15px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: #eef2f7;
    color: var(--primary-dark);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

.hero-panel,
.content-card,
.tool-panel {
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 22px;
}

.content-card {
    background: var(--card);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.narrow-card {
    max-width: 640px;
    margin: 0 auto;
}

.panel-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 12px;
}

.hero-panel ul {
    margin: 0;
    padding-left: 20px;
}

.hero-panel li {
    margin-bottom: 10px;
    color: var(--muted);
}

.upload-form {
    margin-top: 22px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary-dark);
}

.file-input,
.text-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
    font-size: 15px;
}

.help-text {
    margin-top: 8px;
    font-size: 13px;
    color: var(--muted);
}

.field-errors {
    margin-top: 8px;
    padding: 10px 12px;
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
    border-radius: 10px;
    font-size: 14px;
}

.messages {
    margin-bottom: 20px;
}

.message {
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 10px;
    font-size: 14px;
}

.message-error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
}

.message-success {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success-text);
}

.workspace-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.workspace-header {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: flex-start;
}

.workspace-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 20px;
}

.canvas-placeholder {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    overflow: auto;
    min-height: 500px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.plan-preview {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    border: 1px solid var(--border);
    background: #fff;
}

.info-list {
    margin: 0;
}

.info-list dt {
    font-weight: 700;
    color: var(--primary-dark);
    margin-top: 12px;
    font-size: 13px;
}

.info-list dd {
    margin: 4px 0 0;
    color: var(--muted);
    word-break: break-all;
    font-size: 13px;
}

.site-footer {
    padding: 24px 0;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
}

@media (max-width: 900px) {
    .workspace-layout {
        grid-template-columns: 1fr;
    }

    .workspace-header {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .hero-card {
        grid-template-columns: 1fr;
        padding: 22px;
    }

    .hero-text h1,
    .content-card h1,
    .workspace-header h1 {
        font-size: 27px;
    }
}