:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --accent: #2563eb;
    --accent-soft: #dbeafe;
    --border: #dbe3ef;
    --danger: #dc2626;
    --ok: #16a34a;
    --error: #dc2626;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, -apple-system, sans-serif;
    line-height: 1.5;
}

a {
    color: var(--accent);
}

a:hover {
    opacity: 0.92;
}

input,
textarea,
select,
button,
.btn {
    font: inherit;
    border-radius: 10px;
}

input,
textarea,
select {
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #93c5fd;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18);
}

button,
.btn {
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    cursor: pointer;
}

button:hover,
.btn:hover {
    border-color: #93c5fd;
}

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

.error,
.err {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}

.ok,
.flash-ok {
    background: #ecfdf3;
    border-color: #bbf7d0;
    color: #166534;
}