/* ========== Reset & Variables ========== */

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

:root {
    /* 主色调 - 现代商务蓝 */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;
    --primary-text: #1e40af;

    /* 语义色 */
    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;
    --success-text: #065f46;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --danger-border: #fecaca;
    --danger-text: #991b1b;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;

    /* 中性色 */
    --bg: #f4f5f7;
    --card: #ffffff;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-hint: #9ca3af;
    --border: #e5e7eb;
    --border-light: #f3f4f6;

    /* 尺寸 */
    --radius: 8px;
    --radius-sm: 6px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.06), 0 4px 6px rgba(0,0,0,0.04);
}

/* ========== Base ========== */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    text-decoration: underline;
}

/* ========== Layout ========== */

.main-content {
    padding: 32px;
    max-width: 1120px;
    margin: 0 auto;
}

.container {
    width: 100%;
}

@media (max-width: 768px) {
    .main-content { padding: 20px 16px; }
}

/* ========== Forms ========== */

.form-section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
}

.form-section + .form-section {
    margin-top: 20px;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    letter-spacing: 0.01em;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .form-row { grid-template-columns: 1fr; }
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}

.required {
    color: var(--danger);
}

.form-group input[type="text"],
.form-group input[type="url"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--text-primary);
    background: var(--card);
    transition: border-color 0.15s, box-shadow 0.15s;
    line-height: 1.5;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #d1d5db;
}

.form-group textarea {
    resize: vertical;
    min-height: 88px;
}

.adapt-size {
    display: none;
}

.error-message {
    display: block;
    font-size: 13px;
    color: var(--danger);
    margin-top: 6px;
    font-weight: 500;
}

.form-hint {
    font-size: 13px;
    color: var(--text-hint);
    margin-top: 6px;
    line-height: 1.6;
}

/* ========== Buttons ========== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    cursor: pointer;
    background: var(--card);
    color: var(--text-primary);
    text-decoration: none;
    transition: background 0.12s, border-color 0.12s, box-shadow 0.12s;
    white-space: nowrap;
}

.btn:hover {
    background: #f9fafb;
    border-color: #d1d5db;
    text-decoration: none;
}

.btn:active {
    background: #f3f4f6;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #fff;
}

.btn-primary:active {
    background: #1e40af;
}

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

.btn-outline:hover {
    background: #f9fafb;
    color: var(--text-primary);
    border-color: #d1d5db;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

@media (max-width: 480px) {
    .button-group { flex-direction: column; }
    .button-group .btn { width: 100%; }
}

/* ========== Icon Upload ========== */

.icon-upload-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}

.icon-preview {
    width: 96px;
    height: 96px;
    border: 2px dashed var(--border);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background: #fafafa;
    overflow: hidden;
    transition: border-color 0.15s, background 0.15s;
}

.icon-preview:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.icon-preview.has-image {
    border-style: solid;
    border-color: var(--border);
}

.icon-preview.has-image:hover {
    border-color: var(--primary);
}

.icon-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.icon-placeholder {
    font-size: 12px;
    color: var(--text-hint);
    text-align: center;
    padding: 8px;
    line-height: 1.4;
}

.icon-actions {
    display: flex;
    gap: 8px;
}

/* ========== Alert / Flash ========== */

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid transparent;
    line-height: 1.5;
}

.alert-error {
    background: var(--danger-bg);
    color: var(--danger-text);
    border-color: var(--danger-border);
}

.alert-success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: var(--success-border);
}

/* ========== Empty State ========== */

.empty-state {
    text-align: center;
    padding: 64px 20px;
    color: var(--text-hint);
}

.empty-state p {
    font-size: 15px;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

/* ========== Utility ========== */

.form-hint {
    font-size: 13px;
    color: var(--text-hint);
    margin-top: 6px;
}

.checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}