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

:root {
    --bg-page: #edf3fb;
    --bg-page-accent: #dce8f8;
    --bg-surface: rgba(255, 255, 255, 0.88);
    --bg-surface-strong: #ffffff;
    --bg-muted: #f5f8fd;
    --bg-soft: #eaf1fb;
    --text-primary: #163252;
    --text-secondary: #5a7391;
    --text-muted: #7890ab;
    --border-soft: #d6e2f0;
    --border-strong: #b8cadf;
    --brand: #2f63b7;
    --brand-dark: #244f95;
    --brand-soft: #e2ecfb;
    --accent: #4d87df;
    --danger: #d85b52;
    --shadow-soft: 0 24px 60px rgba(22, 50, 82, 0.12);
    --shadow-card: 0 14px 34px rgba(22, 50, 82, 0.08);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-primary);
    background: #fff;
    min-height: 100vh;
}

.container {
    max-width: 1320px;
    margin: 28px auto 40px;
    padding: 28px;
    background: var(--bg-surface);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.75);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: inline-block;
    width: 120px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-row input,
.form-row select,
textarea {
    padding: 10px 12px;
    border: 1px solid var(--border-soft);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.96);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.form-group input,
.form-group select {
    width: 200px;
}

.form-group input:focus,
.form-group select:focus,
.form-row input:focus,
.form-row select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(47, 99, 183, 0.58);
    box-shadow: 0 0 0 4px rgba(47, 99, 183, 0.14);
    background: #fff;
}

.form-group .unit {
    margin-left: 10px;
    font-weight: 600;
    color: var(--text-secondary);
}

.hr-dash {
    border: none;
    border-top: 1px dashed var(--border-strong);
    margin: 18px 0;
}

.btn,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 10px 18px;
    background: linear-gradient(135deg, var(--brand) 0%, #4d87df 100%);
    color: #fff;
    border: 1px solid rgba(36, 79, 149, 0.22);
    border-radius: 999px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.01em;
    box-shadow: 0 10px 20px rgba(47, 99, 183, 0.18);
    transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.btn:hover,
.button:hover {
    transform: translateY(-1px);
    filter: saturate(1.02);
    box-shadow: 0 14px 24px rgba(47, 99, 183, 0.24);
}

.btn:active,
.button:active {
    transform: translateY(0);
}

.button-secondary {
    background: linear-gradient(135deg, #6c86aa 0%, #88a3ca 100%);
    border-color: rgba(74, 100, 141, 0.24);
    box-shadow: 0 10px 20px rgba(90, 115, 145, 0.16);
}

.button-secondary:hover {
    box-shadow: 0 14px 24px rgba(90, 115, 145, 0.22);
}

.button-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #ea7269 100%);
    border-color: rgba(155, 53, 46, 0.24);
    box-shadow: 0 10px 20px rgba(216, 91, 82, 0.16);
}

.button-danger:hover {
    box-shadow: 0 14px 24px rgba(216, 91, 82, 0.2);
}

.result-item {
    margin: 12px 0;
    padding: 14px 16px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(245, 248, 253, 0.98) 100%);
    border-radius: 14px;
    border: 1px solid var(--border-soft);
    border-left: 4px solid var(--brand);
    box-shadow: var(--shadow-card);
}