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

:root {
    --color-bg: #faf9f7;
    --color-surface: #ffffff;
    --color-primary: #7eb8a4;
    --color-primary-light: #d4ede6;
    --color-accent: #f2a65a;
    --color-text: #3a3a3a;
    --color-text-muted: #888;
    --color-border: #e4e0db;
    --tab-height: 60px;
    --font: system-ui, -apple-system, "Hiragino Sans", "Meiryo", sans-serif;
}

html, body {
    height: 100%;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.5;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* メインコンテンツ — タブバー分下余白 */
main {
    padding: 16px 16px calc(var(--tab-height) + 16px);
    min-height: 100%;
}

/* フォーム共通 */
.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color 0.15s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.btn {
    display: inline-block;
    padding: 11px 24px;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    font-family: var(--font);
    cursor: pointer;
    transition: opacity 0.15s;
}

.btn:hover {
    opacity: 0.85;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    width: 100%;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.alert {
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 14px;
    font-size: 0.9rem;
}

.alert-error {
    background: #fde8e8;
    color: #c0392b;
    border: 1px solid #f5c6c6;
}

.alert-info {
    background: var(--color-primary-light);
    color: #2d6a57;
    border: 1px solid #b2d9ce;
}

/* 下部タブバー */
.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--tab-height);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: flex;
    z-index: 100;
}

.tab-bar a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    transition: color 0.15s;
}

.tab-bar a:hover {
    text-decoration: none;
    color: var(--color-primary);
}

.tab-bar a.active {
    color: var(--color-primary);
}

.tab-bar .tab-icon {
    font-size: 1.35rem;
    line-height: 1;
}

.tab-bar .tab-label {
    font-size: 0.65rem;
}