/* [樣式] 全站基礎樣式，支援桌機、平板與手機版面。 */
:root {
    --app-primary: #1d4ed8;
    --app-primary-dark: #0f2f7a;
    --app-bg: #f5f7fb;
    --app-card: #ffffff;
    --app-border: #dbe3ef;
    --app-danger: #dc2626;
}

body {
    min-height: 100vh;
    background: var(--app-bg);
    color: #1f2937;
}

.app-navbar {
    background: linear-gradient(135deg, var(--app-primary-dark), var(--app-primary));
    box-shadow: 0 2px 12px rgba(15, 47, 122, 0.25);
}

.language-select {
    width: auto;
    min-width: 130px;
}

.user-box {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #ffffff;
}

.user-picture {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(255, 255, 255, 0.7);
}

.user-name {
    max-width: 160px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.hero-card {
    padding: 24px;
    border-radius: 20px;
    background: var(--app-card);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.date-table th {
    background: #eef4ff;
    color: #243b6b;
    border-bottom: 1px solid var(--app-border);
}

.date-input-group {
    min-width: 170px;
}

.invalid-message {
    margin-top: 6px;
    font-size: 0.875rem;
    color: var(--app-danger);
}

.result-badge {
    display: inline-block;
    padding: 6px 10px;
    border-radius: 999px;
    background: #eef4ff;
    color: #1d4ed8;
    font-weight: 700;
}

.display-result {
    min-width: 180px;
    word-break: keep-all;
}

.app-footer {
    border-top: 1px solid var(--app-border);
    background: #ffffff;
}

.project-item-title {
    font-weight: 700;
}

.project-meta {
    font-size: 0.875rem;
    color: #6b7280;
}

@media (max-width: 767.98px) {
    .navbar-brand {
        width: 100%;
        margin-bottom: 10px;
    }

    .hero-card {
        padding: 18px;
        border-radius: 16px;
    }

    .btn-group {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .btn-group > .btn {
        border-radius: 0.375rem !important;
        width: 100%;
    }

    .date-table-wrap {
        overflow-x: visible;
    }

    .date-table,
    .date-table thead,
    .date-table tbody,
    .date-table th,
    .date-table td,
    .date-table tr {
        display: block;
    }

    .date-table thead {
        display: none;
    }

    .date-table tr {
        margin: 12px;
        padding: 12px;
        border: 1px solid var(--app-border);
        border-radius: 14px;
        background: #ffffff;
    }

    .date-table td {
        border: 0;
        padding: 8px 0;
    }

    .date-table td::before {
        content: attr(data-label);
        display: block;
        margin-bottom: 6px;
        font-size: 0.85rem;
        font-weight: 700;
        color: #4b5563;
    }

    .date-input-group {
        min-width: 100%;
    }

    .display-result {
        min-width: 100%;
    }
}

/* [2026-05-18] 專案狀態列，讓使用者可以分辨目前是新專案或正在編輯既有專案。 */
.project-state-box {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.35rem;
}

@media (max-width: 575.98px) {
    #newProjectBtn,
    #saveProjectBtn,
    #openProjectsBtn {
        width: 100%;
        margin-right: 0 !important;
        margin-bottom: 0.5rem;
    }
}