/* ============================================
   Tuxiang - 画像処理ツール
   Common Stylesheet
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-primary-bg: #eff6ff;
    --color-secondary: #64748b;
    --color-secondary-dark: #475569;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;

    --color-white: #ffffff;
    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;

    --font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;

    --container-max: 1200px;
    --container-narrow: 800px;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }
h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-dark); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
input, select, textarea, button { font-family: inherit; font-size: inherit; }

/* --- Container --- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--spacing-lg); width: 100%; }

/* --- Section --- */
.section { padding: var(--spacing-3xl) 0; }
.section-title { text-align: center; margin-bottom: var(--spacing-2xl); }
.section-title h2 { margin-bottom: var(--spacing-sm); }
.section-title p { color: var(--color-text-secondary); font-size: var(--font-size-lg); }

/* --- Header --- */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
}

.logo:hover { color: var(--color-primary-dark); }

.logo-icon {
    width: 32px; height: 32px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 800;
    font-size: var(--font-size-lg);
}

/* --- Navigation --- */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.nav-user-area {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: var(--spacing-md);
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
}

/* --- Hamburger Menu --- */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px; height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.hamburger-btn:hover { background: var(--color-bg-alt); }

.hamburger-btn span {
    display: block;
    width: 22px; height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.hamburger-btn span + span { margin-top: 5px; }

.hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active span:nth-child(2) { opacity: 0; }

.hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Mobile Nav Overlay --- */
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.nav-overlay.active {
    display: block;
    opacity: 1;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1.5;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-alt);
    border-color: var(--color-secondary);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--color-white);
    border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-danger-dark);
    border-color: var(--color-danger-dark);
    color: var(--color-white);
}

.btn-sm { padding: 0.375rem 0.75rem; font-size: var(--font-size-xs); }
.btn-lg { padding: 0.875rem 1.75rem; font-size: var(--font-size-base); }
.btn-block { display: flex; width: 100%; }

/* --- Cards --- */
.card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover { box-shadow: var(--shadow-md); }
.card-body { padding: var(--spacing-lg); }
.card-title { font-size: var(--font-size-lg); font-weight: 700; margin-bottom: var(--spacing-sm); }
.card-text { color: var(--color-text-secondary); font-size: var(--font-size-sm); line-height: 1.6; }

/* --- Forms --- */
.form-group { margin-bottom: var(--spacing-lg); }

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.form-input::placeholder { color: var(--color-text-muted); }
.form-error { color: var(--color-danger); font-size: var(--font-size-xs); margin-top: var(--spacing-xs); }
.form-hint { color: var(--color-text-muted); font-size: var(--font-size-xs); margin-top: var(--spacing-xs); }

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--color-primary); }

/* --- Grid --- */
.grid { display: grid; gap: var(--spacing-lg); }
/* grid 子项默认 min-width:auto，超长不换行内容（如长文件名）会把列撑出屏幕，统一收紧 */
.grid > * { min-width: 0; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* --- Footer --- */
.site-footer {
    background: var(--color-text);
    color: var(--color-text-muted);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 { color: var(--color-white); font-size: var(--font-size-base); font-weight: 700; margin-bottom: var(--spacing-md); }

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a { color: var(--color-text-muted); font-size: var(--font-size-sm); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-white); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-sm);
}

/* --- Toast --- */
.toast-container {
    position: fixed;
    top: 80px;
    right: var(--spacing-lg);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 380px;
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: toastSlideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.toast-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.toast-info { background: var(--color-primary-bg); color: #1e40af; border: 1px solid #bfdbfe; }
.toast-warning { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }

.toast-close {
    background: none; border: none; cursor: pointer; font-size: var(--font-size-lg);
    color: inherit; opacity: 0.7; margin-left: auto; padding: 0; line-height: 1;
}
.toast-close:hover { opacity: 1; }

@keyframes toastSlideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* --- Loading Spinner --- */
.spinner {
    width: 20px; height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* --- Badge --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    line-height: 1.5;
}

.badge-primary { background: var(--color-primary-bg); color: var(--color-primary); }
.badge-success { background: #ecfdf5; color: #065f46; }
.badge-warning { background: #fffbeb; color: #92400e; }
.badge-danger { background: #fef2f2; color: #991b1b; }
.badge-vip { background: linear-gradient(135deg, #f59e0b, #d97706); color: var(--color-white); }

/* --- VIP Badge --- */
.vip-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: var(--color-white);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 700;
}

/* 导航栏 VIP 角标（VIP 功能入口标识，如 PDFツール） */
.nav-vip-badge {
    display: inline-block;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: var(--color-white);
    font-size: 0.5625rem;
    font-weight: 700;
    line-height: 1.4;
    padding: 0 5px;
    border-radius: var(--radius-full);
    margin-left: 4px;
    vertical-align: text-top;
    letter-spacing: 0.03em;
    box-shadow: 0 1px 4px rgba(217, 119, 6, 0.3);
}

/* 用户区域悬停提示 */
.user-menu-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: relative;
    cursor: default;
    padding: 4px 8px;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.user-menu-wrapper:hover {
    background: var(--color-bg-alt);
}

.vip-tooltip {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 8px;
    background: var(--color-text);
    color: var(--color-white);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    white-space: nowrap;
    z-index: 100;
    font-size: var(--font-size-xs);
    line-height: 1.5;
    box-shadow: var(--shadow-lg);
}

.vip-tooltip::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid var(--color-text);
}

.user-menu-wrapper:hover .vip-tooltip {
    display: block;
}

.vip-tooltip-title {
    font-weight: 700;
    margin-bottom: 2px;
}

.vip-tooltip-text {
    color: #94a3b8;
}

/* --- Page Header --- */
.page-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
}

.page-header h1 { font-size: var(--font-size-2xl); margin-bottom: var(--spacing-xs); }
.page-header p { color: var(--color-text-secondary); font-size: var(--font-size-sm); }

/* --- Tool Upload Area --- */
.tool-upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl) var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-white);
    position: relative;
    z-index: 1;
}

.tool-upload-area:hover,
.tool-upload-area.drag-over {
    border-color: var(--color-primary);
    background: var(--color-primary-bg);
}

.upload-icon {
    width: 64px; height: 64px;
    margin: 0 auto var(--spacing-lg);
    background: var(--color-primary-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.upload-text { font-size: var(--font-size-lg); font-weight: 600; color: var(--color-text); margin-bottom: var(--spacing-xs); }
.upload-hint { color: var(--color-text-secondary); font-size: var(--font-size-sm); }

.upload-formats {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.format-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-bg);
    border-radius: var(--radius-sm);
}

/* --- Result Area --- */
.result-area { margin-top: var(--spacing-xl); display: none; }
.result-area.visible { display: block; }

.result-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.result-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
}

.result-card-title { font-size: var(--font-size-base); font-weight: 700; }

.result-info {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.result-info-label { color: var(--color-text-secondary); }
.result-info-value { color: var(--color-text); font-weight: 500; }

/* --- File List --- */
.file-list { display: flex; flex-direction: column; gap: var(--spacing-sm); }

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 12px 16px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: box-shadow var(--transition-fast);
}

.file-item:hover { box-shadow: var(--shadow-sm); }

.file-item-icon {
    width: 36px; height: 36px;
    background: var(--color-bg-alt);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.file-item-info { flex: 1; min-width: 0; }
.file-item-name { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-item-size { font-size: var(--font-size-xs); color: var(--color-text-muted); margin-top: 2px; }
.file-item-action { flex-shrink: 0; }

.file-item-status { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.file-item-status.completed { color: var(--color-success); }
.file-item-status.processing { color: var(--color-primary); }
.file-item-status.error { color: var(--color-danger); }

/* --- Comparison --- */
.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); }
.comparison-item { text-align: center; }
.comparison-item img { width: 100%; border-radius: var(--radius-md); border: 1px solid var(--color-border); }
.comparison-label { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text-secondary); margin-top: var(--spacing-sm); }
.comparison-size { font-size: var(--font-size-xs); color: var(--color-text-muted); }

/* --- Utility --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.d-flex { display: flex; }
.d-flex-center { display: flex; align-items: center; justify-content: center; }
.d-flex-between { display: flex; align-items: center; justify-content: space-between; }
.w-full { width: 100%; }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

/* --- Captcha --- */
.verify-code-row { display: flex; gap: var(--spacing-sm); flex-wrap: wrap; }
.verify-code-row .form-input { flex: 1; min-width: 80px; }
.captcha-wrapper { display: flex; align-items: center; flex-shrink: 0; }
.captcha-wrapper img { display: block; height: 40px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer; }


/* --- Payment Modal Mobile --- */
@media (max-width: 768px) {
    .payment-modal-content {
        padding: var(--spacing-md);
        max-width: 360px;
        overflow-y: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
        border-radius: var(--radius-2xl);
    }
}
/* --- Responsive --- */
@media (max-width: 768px) {
    .hamburger-btn { display: flex; }

    .nav-menu {
        position: fixed;
        top: 64px;
        right: 0;
        width: 280px;
        bottom: 0;
        background: var(--color-white);
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: 999;
        overflow-y: auto;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active { transform: translateX(0); }

    .nav-overlay.active { display: block; }

    .nav-link { padding: var(--spacing-md); font-size: var(--font-size-base); border-radius: var(--radius-md); }

    .nav-user-area {
        margin-left: 0;
        padding-top: var(--spacing-md);
        border-top: 1px solid var(--color-border);
        flex-direction: column;
        width: 100%;
    }

    .nav-user-area .btn { width: 100%; }
    .section { padding: var(--spacing-2xl) 0; }
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }

    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: var(--spacing-lg); }
    .comparison-grid { grid-template-columns: 1fr; }
    .container { padding: 0 var(--spacing-md); }

    .toast-container { left: var(--spacing-md); right: var(--spacing-md); max-width: none; }
    .tool-upload-area { padding: var(--spacing-xl) var(--spacing-md); }
    .file-item { flex-wrap: wrap; }
    .file-item-action { width: 100%; justify-content: flex-end; padding-top: var(--spacing-xs); border-top: 1px solid var(--color-border-light); }
}

@media (max-width: 480px) {
    .header-inner { height: 56px; padding: 0 var(--spacing-md); }
    .logo { font-size: var(--font-size-lg); }
    .page-header { padding: var(--spacing-lg) 0; }
    .page-header h1 { font-size: var(--font-size-xl); }
    .section-title h2 { font-size: var(--font-size-xl); }
    .section-title p { font-size: var(--font-size-base); }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { gri