/* ========== Reset & Base ========== */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --radius: 8px;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", sans-serif;
    color: var(--gray-900);
    background: var(--gray-50);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; width: 100%; }

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

/* ========== Header ========== */
.header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header .container {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
}
.logo-icon { font-size: 24px; }
.header-subtitle {
    font-size: 14px;
    color: var(--gray-500);
}

/* ========== Main ========== */
.main {
    flex: 1;
    padding: 32px 20px;
}

/* ========== Footer ========== */
.footer {
    background: #fff;
    border-top: 1px solid var(--gray-200);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: var(--gray-500);
}

/* ========== Flash ========== */
.flash-messages { margin-bottom: 16px; }
.flash-message {
    padding: 12px 16px;
    border-radius: var(--radius);
    background: var(--primary-light);
    color: var(--primary);
    font-size: 14px;
    margin-bottom: 8px;
}

/* ========== Cards ========== */
.card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.card-header {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-100);
}
.card + .card { margin-top: 20px; }

/* ========== Steps ========== */
.steps {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 32px;
    counter-reset: step;
}
.step {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--gray-500);
    padding: 8px 16px;
    position: relative;
}
.step.active { color: var(--primary); font-weight: 600; }
.step.done { color: var(--success); }
.step-dot {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    counter-increment: step;
}
.step-dot::after { content: counter(step); }
.step.active .step-dot { background: var(--primary); color: #fff; }
.step.done .step-dot { background: var(--success); color: #fff; }
.step-line {
    width: 40px;
    height: 2px;
    background: var(--gray-200);
    margin: 0 4px;
}
.step-line.done { background: var(--success); }

/* ========== Upload Zone ========== */
.upload-section {
    margin-bottom: 24px;
}
.upload-section label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-700);
}
.upload-zone {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--gray-50);
    position: relative;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.upload-zone.has-file {
    border-color: var(--success);
    background: var(--success-light);
}
.upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}
.upload-icon { font-size: 36px; margin-bottom: 8px; }
.upload-text { font-size: 14px; color: var(--gray-500); }
.upload-text strong { color: var(--primary); }
.upload-hint { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.file-name {
    font-size: 13px;
    color: var(--success);
    margin-top: 8px;
    font-weight: 500;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}
.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-outline {
    background: #fff;
    border-color: var(--gray-300);
    color: var(--gray-700);
}
.btn-outline:hover { background: var(--gray-50); }
.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
    width: 100%;
}
.btn-block { display: flex; width: 100%; }

/* ========== Loading ========== */
.loading {
    display: none;
    text-align: center;
    padding: 32px;
}
.loading.active { display: block; }
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 14px; color: var(--gray-500); }

/* ========== Summary ========== */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.summary-item {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
}
.summary-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}
.summary-label {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}

/* ========== Tags ========== */
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}
.tag-strong { background: var(--success-light); color: var(--success); }
.tag-missing { background: var(--danger-light); color: var(--danger); }
.tag-weak { background: var(--warning-light); color: #b45309; }
.tag-info { background: var(--primary-light); color: var(--primary); }

/* ========== Report Content ========== */
.report-content {
    font-size: 14px;
    line-height: 1.8;
}
.report-content h1 { font-size: 22px; margin: 24px 0 12px; color: var(--gray-900); }
.report-content h2 { font-size: 18px; margin: 20px 0 10px; color: var(--gray-700); border-bottom: 1px solid var(--gray-100); padding-bottom: 6px; }
.report-content h3 { font-size: 15px; margin: 16px 0 8px; color: var(--gray-700); }
.report-content ul { padding-left: 20px; margin: 8px 0; }
.report-content li { margin-bottom: 4px; }
.report-content code {
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}
.report-content img { max-width: 100%; border-radius: var(--radius); }
.report-content blockquote {
    border-left: 3px solid var(--primary);
    padding: 8px 16px;
    margin: 12px 0;
    background: var(--primary-light);
    border-radius: 0 var(--radius) var(--radius) 0;
}

/* ========== Payment ========== */
.payment-methods {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}
.payment-method {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}
.payment-method:hover { border-color: var(--primary); background: var(--primary-light); }
.payment-method.selected { border-color: var(--primary); background: var(--primary-light); }
.payment-method-icon { font-size: 32px; margin-bottom: 8px; }
.payment-method-name { font-size: 15px; font-weight: 600; }
.payment-method-desc { font-size: 12px; color: var(--gray-500); margin-top: 4px; }

.qr-container {
    text-align: center;
    padding: 24px;
}
.qr-container canvas {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 8px;
}
.qr-hint {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 12px;
}

.price-display {
    text-align: center;
    padding: 20px;
}
.price-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--danger);
}
.price-unit { font-size: 16px; color: var(--gray-500); }

/* ========== Tabs ========== */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 20px;
    overflow-x: auto;
}
.tab {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    white-space: nowrap;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}
.tab:hover { color: var(--gray-700); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ========== Download ========== */
.download-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: var(--success-light);
    border-radius: var(--radius);
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.download-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--success);
}

/* ========== Result Lock ========== */
.locked-section {
    position: relative;
    padding: 24px;
    background: var(--gray-50);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}
.locked-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(4px);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}
.lock-icon { font-size: 48px; margin-bottom: 12px; }
.lock-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 16px;
}
.blur-content { filter: blur(5px); user-select: none; }

/* ========== Alerts ========== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    margin-bottom: 16px;
}
.alert-error { background: var(--danger-light); color: var(--danger); }
.alert-success { background: var(--success-light); color: var(--success); }
.alert-info { background: var(--primary-light); color: var(--primary); }

/* ========== Responsive ========== */
@media (max-width: 640px) {
    .payment-methods { grid-template-columns: 1fr; }
    .summary-grid { grid-template-columns: 1fr 1fr; }
    .header .container { flex-wrap: wrap; }
    .btn-lg { font-size: 14px; }
}