/*
主要介面樣式
版面以桌面與手機共同操作為設計原則
*/
:root {
    --app-radius: 1rem;
    --app-shadow: 0 10px 30px rgba(22, 35, 60, 0.08);
    --app-border: rgba(100, 116, 139, 0.22);
    --app-header-bg: rgba(255, 255, 255, 0.92);
    --app-code-bg: #f8fafc;
    --app-drop-bg: #f8fbff;
}

[data-bs-theme="dark"] {
    --app-shadow: 0 10px 30px rgba(0, 0, 0, 0.24);
    --app-border: rgba(148, 163, 184, 0.22);
    --app-header-bg: rgba(20, 25, 33, 0.94);
    --app-code-bg: #111820;
    --app-drop-bg: #111923;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    background:
        radial-gradient(circle at 15% 0%, rgba(13, 110, 253, 0.08), transparent 32rem),
        radial-gradient(circle at 85% 12%, rgba(111, 66, 193, 0.07), transparent 28rem),
        var(--bs-body-bg);
}

button,
.form-control,
.form-select {
    touch-action: manipulation;
}

.app-header {
    background: var(--app-header-bg);
    backdrop-filter: blur(16px);
    z-index: 1030;
}

.navbar-brand {
    color: var(--bs-body-color);
    text-decoration: none;
}

.brand-icon {
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 0.8rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: linear-gradient(135deg, #0d6efd, #6f42c1);
    box-shadow: 0 6px 18px rgba(13, 110, 253, 0.25);
}

.brand-title {
    display: block;
    font-weight: 700;
    line-height: 1.05;
    font-size: 1.02rem;
}

.brand-version {
    font-size: 0.7rem;
    color: var(--bs-secondary-color);
}

.icon-button,
.language-button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 2.3rem;
}

.language-menu {
    min-width: 12.5rem;
}

.language-option {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-height: 2.75rem;
}

.lang-code {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.2rem;
    height: 1.8rem;
    padding-inline: 0.35rem;
    border-radius: 0.5rem;
    font-weight: 700;
    font-size: 0.75rem;
    background: var(--bs-tertiary-bg);
    border: 1px solid var(--app-border);
}

.hero-card,
.tool-card {
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    background: var(--bs-body-bg);
    box-shadow: var(--app-shadow);
}

.hero-card {
    padding: clamp(1rem, 2vw, 1.5rem);
}

.tool-card {
    padding: clamp(1rem, 2vw, 1.4rem);
}

.privacy-note {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 0.9rem;
    border-radius: 0.85rem;
    background: var(--bs-tertiary-bg);
    border: 1px solid var(--app-border);
}

.privacy-note > i {
    color: var(--bs-success);
    margin-top: 0.15rem;
    font-size: 1.2rem;
}

.tool-tabs-wrapper {
    position: sticky;
    top: 4.15rem;
    z-index: 1020;
    padding: 0.45rem;
    border: 1px solid var(--app-border);
    border-radius: 0.9rem;
    background: var(--app-header-bg);
    backdrop-filter: blur(14px);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.05);
}

.tool-tabs {
    gap: 0.35rem;
    scrollbar-width: thin;
    scroll-snap-type: x proximity;
}

.tool-tabs .nav-link {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 2.65rem;
    white-space: nowrap;
    scroll-snap-align: start;
    border-radius: 0.7rem;
}

.card-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--app-border);
}

.form-label {
    font-weight: 650;
}

.form-text {
    line-height: 1.35;
}

.code-area,
.code-input {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.code-area {
    resize: vertical;
    min-height: 8rem;
    background: var(--app-code-bg);
    line-height: 1.5;
    tab-size: 4;
}

.conversion-row .code-area {
    min-height: 19rem;
}

.field-title-row {
    min-height: 2.15rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.field-title-row .btn,
.action-bar .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.42rem;
}

.stats-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 0.35rem;
    color: var(--bs-secondary-color);
    font-size: 0.78rem;
}

.action-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.65rem;
}

.drop-zone {
    border: 2px dashed rgba(13, 110, 253, 0.4);
    background: var(--app-drop-bg);
    border-radius: 1rem;
    min-height: 12rem;
    padding: 1.5rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color 0.16s ease, background-color 0.16s ease, transform 0.16s ease;
}

.drop-zone:hover,
.drop-zone:focus,
.drop-zone.is-dragging {
    border-color: var(--bs-primary);
    outline: none;
    transform: translateY(-1px);
}

.file-meta,
.analysis-grid {
    display: grid;
    gap: 0.75rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.file-meta > div,
.analysis-grid > div {
    min-width: 0;
    padding: 0.8rem;
    border-radius: 0.75rem;
    background: var(--bs-tertiary-bg);
    border: 1px solid var(--app-border);
}

.file-meta span,
.analysis-grid span {
    display: block;
    color: var(--bs-secondary-color);
    font-size: 0.76rem;
    margin-bottom: 0.2rem;
}

.file-meta strong,
.analysis-grid strong {
    display: block;
    overflow-wrap: anywhere;
}

.preview-panel {
    padding: 1rem;
    border-radius: 0.85rem;
    background: var(--bs-tertiary-bg);
    border: 1px solid var(--app-border);
}

.preview-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 650;
    margin-bottom: 0.75rem;
}

#decodePreview img,
#decodePreview video {
    display: block;
    max-width: 100%;
    max-height: 28rem;
    margin-inline: auto;
    border-radius: 0.65rem;
}

#decodePreview audio {
    width: 100%;
}

.site-footer {
    border-top: 1px solid var(--app-border);
    background: var(--bs-tertiary-bg);
}

.footer-toggle {
    border: 0;
    background: transparent;
    color: var(--bs-body-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 2.75rem;
    padding: 0;
    font-weight: 650;
    text-align: left;
}

.footer-toggle[aria-expanded="true"] .footer-chevron {
    transform: rotate(180deg);
}

.footer-chevron {
    transition: transform 0.18s ease;
}

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

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.tech-badges span {
    display: inline-flex;
    align-items: center;
    min-height: 1.9rem;
    padding: 0.25rem 0.55rem;
    border-radius: 999px;
    font-size: 0.76rem;
    background: var(--bs-body-bg);
    border: 1px solid var(--app-border);
}

.toast-container {
    z-index: 1090;
}

.status-valid {
    color: var(--bs-success);
}

.status-invalid {
    color: var(--bs-danger);
}

.progress {
    height: 1.25rem;
}

@media (max-width: 991.98px) {
    .tool-tabs-wrapper {
        top: 3.95rem;
        margin-inline: -0.2rem;
    }

    .settings-grid .form-text {
        font-size: 0.75rem;
    }

    .file-meta,
    .analysis-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 575.98px) {
    .container-xl {
        --bs-gutter-x: 1rem;
    }

    .app-header .navbar {
        min-height: 3.65rem;
    }

    .brand-icon {
        width: 2.15rem;
        height: 2.15rem;
        border-radius: 0.72rem;
    }

    .brand-title {
        font-size: 0.92rem;
        max-width: 10rem;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .top-actions {
        gap: 0.35rem !important;
    }

    .language-button {
        max-width: 9.2rem;
    }

    .language-button #currentLanguageName {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .hero-card {
        border-radius: 0.85rem;
    }

    .hero-card h1 {
        font-size: 1.35rem;
    }

    .tool-card {
        padding: 0.9rem;
        border-radius: 0.85rem;
    }

    .tool-tabs-wrapper {
        top: 3.65rem;
        padding: 0.32rem;
        border-radius: 0.75rem;
    }

    .tool-tabs .nav-link {
        min-height: 2.5rem;
        padding: 0.5rem 0.7rem;
        font-size: 0.86rem;
    }

    .field-title-row {
        align-items: flex-end;
    }

    .field-title-row .btn-group .btn span {
        display: none;
    }

    .conversion-row .code-area {
        min-height: 14rem;
    }

    .action-bar {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .action-bar .btn {
        width: 100%;
        min-height: 2.75rem;
    }

    .action-bar .btn-lg {
        font-size: 1rem;
    }

    .action-bar .ms-lg-auto {
        margin-left: 0 !important;
    }

    .file-meta,
    .analysis-grid {
        grid-template-columns: 1fr 1fr;
    }

    .drop-zone {
        min-height: 10rem;
        padding: 1rem;
    }

    .footer-toggle {
        min-height: 3rem;
    }
}

@media (max-width: 380px) {
    .brand-version,
    #themeToggle span {
        display: none !important;
    }

    .language-button {
        max-width: 7.5rem;
    }

    .file-meta,
    .analysis-grid,
    .action-bar {
        grid-template-columns: 1fr;
    }
}