/* ============== 全局 ============== */
:root {
    --red: #dc2626;
    --red-light: #fef2f2;
    --green: #16a34a;
    --gold: #f59e0b;
    --dark: #1f2937;
    --gray: #6b7280;
    --light: #f9fafb;
    --border: #e5e7eb;
    --radius: 12px;
    --shadow: 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);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background: var(--light);
}

.container { max-width: 800px; margin: 0 auto; padding: 0 20px; }

/* ============== 导航 ============== */
.navbar {
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 18px; font-weight: 700; }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a { color: var(--gray); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--dark); }
.btn-nav {
    background: var(--red);
    color: white !important;
    padding: 6px 16px;
    border-radius: 6px;
    font-weight: 500;
}

/* ============== Hero ============== */
.hero {
    text-align: center;
    padding: 60px 0 40px;
    background: linear-gradient(180deg, white 0%, var(--light) 100%);
}
.hero h1 { font-size: 36px; margin-bottom: 12px; }
.hero .highlight { color: var(--red); }
.subtitle { color: var(--gray); font-size: 16px; }

/* ============== 上传区 ============== */
.upload-section { padding: 0 0 60px; }
.upload-card {
    background: white;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.step-indicator { display: flex; gap: 16px; margin-bottom: 24px; }
.step-indicator .step {
    font-size: 13px;
    color: var(--gray);
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--light);
}
.step-indicator .step.active { background: var(--red-light); color: var(--red); font-weight: 600; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 8px; font-size: 14px; }

.broker-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.broker-option {
    display: block;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.broker-option:hover { border-color: var(--red); }
.broker-option.selected { border-color: var(--red); background: var(--red-light); }
.broker-option input { display: none; }
.broker-name { display: block; font-weight: 600; font-size: 14px; }
.broker-desc { font-size: 12px; color: var(--gray); }

.broker-hint {
    margin-top: 12px;
    padding: 12px 16px;
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    font-size: 13px;
    line-height: 1.7;
}
.broker-hint strong { color: var(--dark); }
.broker-hint p { margin: 4px 0; color: #374151; }
.broker-hint .hint-note { color: var(--gray); font-size: 12px; padding-left: 12px; }
.broker-hint .hint-warn { color: #b45309; font-weight: 500; }

.wechat-id { margin-top: 8px; font-size: 15px; color: var(--dark); }

.more-brokers {
    margin-top: 12px;
    padding: 10px 14px;
    background: #fefce8;
    border: 1px solid #fde68a;
    border-radius: 8px;
    font-size: 13px;
    color: #92400e;
}
.more-brokers a { color: var(--red); font-weight: 600; }

.input-field {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

/* 拖拽区 */
.dropzone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--red); background: var(--red-light); }
.dropzone-icon { font-size: 40px; }
.dropzone p { margin-top: 8px; color: var(--gray); font-size: 14px; }
.dropzone .link { color: var(--red); font-weight: 500; }
.dropzone .hint { font-size: 12px; margin-top: 4px; }

.file-list { margin-top: 8px; }
.file-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 12px; background: var(--light); border-radius: 6px; margin-top: 4px; font-size: 13px;
}
.file-item .remove { color: var(--red); cursor: pointer; font-weight: bold; }

/* 按钮 */
.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--red);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-primary:hover:not(:disabled) { background: #b91c1c; transform: translateY(-1px); }
.btn-primary:disabled { background: #ccc; cursor: not-allowed; }

.spinner {
    display: inline-block;
    width: 16px; height: 16px;
    border: 2px solid white;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============== 结果区 ============== */
.result-section { padding: 0 0 60px; }
.result-card {
    background: white;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}
.result-header { text-align: center; margin-bottom: 24px; }
.result-icon { font-size: 48px; }
.result-header h2 { margin-top: 8px; }

.result-info { margin-bottom: 24px; }
.info-row {
    display: flex; justify-content: space-between;
    padding: 8px 0; border-bottom: 1px solid var(--border);
    font-size: 14px;
}
.info-row .label { color: var(--gray); }
.info-row .value { font-weight: 600; }

/* 税额展示 */
.tax-result {
    text-align: center;
    padding: 24px;
    background: linear-gradient(135deg, #fef2f2 0%, #fff7ed 100%);
    border-radius: var(--radius);
    margin-bottom: 24px;
}
.tax-label { font-size: 14px; color: var(--gray); margin-bottom: 8px; }
.tax-amount {
    font-size: 36px;
    font-weight: 800;
    color: var(--red);
    letter-spacing: -1px;
}
.tax-breakdown { margin-top: 12px; font-size: 13px; color: var(--gray); }

/* 付费引导 */
.paywall {
    text-align: center;
    padding: 24px;
    background: var(--light);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.lock-icon { font-size: 32px; margin-bottom: 8px; }
.paywall-text { font-size: 14px; color: var(--dark); margin-bottom: 16px; font-weight: 500; }
.paywall-features { text-align: left; margin: 16px auto; max-width: 320px; }
.feature { font-size: 13px; padding: 4px 0; color: var(--gray); }
.btn-unlock {
    display: inline-block;
    margin-top: 16px;
    padding: 12px 32px;
    background: var(--red);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
}
.btn-unlock:hover { background: #b91c1c; }
.price-hint { margin-top: 8px; font-size: 12px; color: var(--gray); }

/* 错误展示 */
.error-box {
    padding: 16px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    margin-bottom: 16px;
    color: #991b1b;
    font-size: 14px;
    line-height: 1.8;
}
.error-tips {
    padding: 16px;
    background: var(--light);
    border-radius: 8px;
    font-size: 13px;
}
.error-tips h3 { margin-bottom: 8px; font-size: 14px; }
.error-tips ul { padding-left: 20px; color: var(--gray); }
.error-tips li { margin-bottom: 4px; }
.error-tips a { color: var(--red); font-weight: 600; }

/* ============== 使用方法 ============== */
.how-section { padding: 60px 0; }
.how-section h2 { text-align: center; margin-bottom: 32px; }
.steps-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.step-card { text-align: center; padding: 24px; background: white; border-radius: var(--radius); box-shadow: var(--shadow); }
.step-num { width: 36px; height: 36px; line-height: 36px; background: var(--red); color: white; border-radius: 50%; margin: 0 auto 12px; font-weight: 700; }
.step-card h3 { margin-bottom: 8px; }
.step-card p { font-size: 13px; color: var(--gray); }

/* ============== FAQ ============== */
.faq-section { padding: 60px 0; background: white; }
.faq-section h2 { text-align: center; margin-bottom: 32px; }
.faq-item { margin-bottom: 8px; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.faq-item summary { padding: 14px 16px; font-weight: 600; font-size: 14px; cursor: pointer; }
.faq-item p { padding: 0 16px 14px; font-size: 14px; color: var(--gray); }

/* ============== 联系 ============== */
.contact-section { padding: 60px 0; }
.contact-section h2 { text-align: center; margin-bottom: 32px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 500px; margin: 0 auto; }
.contact-card { text-align: center; padding: 24px; background: white; border-radius: var(--radius); box-shadow: var(--shadow); }
.contact-icon { font-size: 32px; margin-bottom: 8px; }
.contact-card h3 { margin-bottom: 4px; }
.contact-card p { font-size: 13px; color: var(--gray); }
.qr-placeholder { margin-top: 8px; padding: 40px; background: var(--light); border-radius: 8px; font-size: 12px; color: var(--gray); }

/* ============== Footer ============== */
.footer { padding: 24px 0; text-align: center; font-size: 12px; color: var(--gray); border-top: 1px solid var(--border); }
.footer a { color: var(--gray); }

/* ============== 响应式 ============== */
@media (max-width: 640px) {
    .hero h1 { font-size: 28px; }
    .broker-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .nav-links a:not(.btn-nav) { display: none; }
}