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

:root {
    --bg: #eef3f7;
    --panel: #ffffff;
    --border: #d7e0e8;
    --text: #203040;
    --muted: #5f7283;
    --accent: #1f5f7a;
    --accent-dark: #18485d;
    --success: #1f7a4d;
    --danger: #b33a3a;
    --shadow: 0 12px 32px rgba(24, 53, 77, 0.08);
    --radius: 18px;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
}

body {
    min-height: 100vh;
}

.container {
    width: min(1400px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header,
.site-footer {
    background: #e7eef4;
    border-bottom: 1px solid var(--border);
}

.site-footer {
    border-top: 1px solid var(--border);
    border-bottom: 0;
    margin-top: 24px;
}

.site-header-inner,
.site-footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 0;
}

.brand-title {
    margin: 0;
    font-size: 24px;
    line-height: 1.2;
}

.brand-subtitle,
.footer-note {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.app-shell {
    padding: 24px 0;
}

.layout-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 24px;
    align-items: start;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 22px;
}

.panel h2,
.panel h3 {
    margin-top: 0;
}

.form-intro,
.output-intro {
    color: var(--muted);
    margin-bottom: 18px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group.full {
    grid-column: 1 / -1;
}

label {
    font-weight: 700;
    font-size: 14px;
}

input,
select,
textarea,
button {
    font: inherit;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    padding: 12px 14px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(31, 95, 122, 0.12);
}

.help-text {
    margin: 0;
    color: var(--muted);
    font-size: 12px;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.btn {
    border: 0;
    border-radius: 12px;
    padding: 12px 18px;
    cursor: pointer;
    font-weight: 700;
    transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
}

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

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

.btn-secondary {
    background: #eef3f7;
    color: var(--text);
    border: 1px solid var(--border);
}

.output-state {
    padding: 16px;
    border-radius: 14px;
    border: 1px dashed var(--border);
    background: #f8fbfd;
    color: var(--muted);
    margin-bottom: 18px;
}

.output-state.hidden,
.output-wrapper.hidden,
.alert.hidden,
.loader.hidden {
    display: none;
}

.alert {
    padding: 14px 16px;
    border-radius: 12px;
    margin-bottom: 16px;
    font-weight: 700;
}

.alert-error {
    background: #fff1f1;
    color: var(--danger);
    border: 1px solid #f1c8c8;
}

.alert-success {
    background: #effaf4;
    color: var(--success);
    border: 1px solid #cbe9d6;
}

.loader {
    margin-bottom: 18px;
    padding: 14px 16px;
    border-radius: 12px;
    background: #f4f9fc;
    border: 1px solid #d8e9f3;
    color: var(--accent);
    font-weight: 700;
}

.output-box {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    background: #fbfdff;
    margin-bottom: 16px;
}

.output-box-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.output-box-title {
    margin: 0;
    font-size: 18px;
}

.output-content {
    white-space: pre-wrap;
    word-break: break-word;
}

.output-bullets {
    margin: 0;
    padding-left: 18px;
}

.output-bullets li {
    margin-bottom: 8px;
}

.copy-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.small-btn {
    padding: 9px 12px;
    font-size: 13px;
}

.error-list {
    margin: 8px 0 0;
    padding-left: 18px;
}

.section-divider {
    height: 1px;
    background: var(--border);
    margin: 22px 0;
}

@media (max-width: 1100px) {
    .layout-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 700px) {
    .form-grid {
        grid-template-columns: 1fr;
    }

    .site-header-inner,
    .site-footer-inner,
    .output-box-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .container {
        width: min(100% - 20px, 1400px);
    }

    .panel {
        padding: 18px;
    }
}