/* ========================================
   AI 小红书图文生成器 - 现代浅色主题
   ======================================== */

/* Variables */
:root {
    --primary: #ff6b81;
    --primary-light: #ff8fa3;
    --primary-dark: #e8556b;
    --accent: #ffb347;
    --bg-body: #f8f5f7;
    --bg-card: #ffffff;
    --bg-input: #f9f6f8;
    --bg-preview: #e5e2e8;
    --border-light: #ede7eb;
    --border-focus: #ff6b81;
    --shadow-sm: 0 1px 8px rgba(140, 100, 120, 0.06);
    --shadow-md: 0 4px 20px rgba(140, 100, 120, 0.10);
    --shadow-lg: 0 8px 32px rgba(140, 100, 120, 0.14);
    --shadow-btn: 0 4px 14px rgba(255, 107, 129, 0.35);
    --text-primary: #1f1b24;
    --text-secondary: #6e6578;
    --text-muted: #a89fb0;
    --radius: 18px;
    --radius-sm: 12px;
    --radius-pill: 100px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.2s var(--ease);
}

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

html {
    margin: 0;
    padding: 0;
    height: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-primary);
    background: linear-gradient(160deg, #fdf6f9 0%, var(--bg-body) 40%, #f3f0f8 100%);
    background-attachment: fixed;
    min-height: 100vh;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.5;
}

/* Container */
.container {
    max-width: 720px;
    width: 100%;
    padding: 32px 20px;
}

/* ========================================
   Header
   ======================================== */
header {
    margin-bottom: 32px !important;
}

header h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, #c44dff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: var(--primary);
}

header h1 i {
    -webkit-text-fill-color: var(--accent);
    margin-right: 6px;
}

header .lead {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.95rem;
    margin: 0;
}

/* ========================================
   Card
   ======================================== */
.card {
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
}

/* Card Header */
.card-header {
    border-bottom: 1px solid var(--border-light);
    font-weight: 600;
    padding: 14px 20px;
    background: #fff !important;
    color: var(--text-primary) !important;
}

.card-header h5 {
    font-weight: 700;
    font-size: 0.88rem;
    letter-spacing: 0.3px;
    color: var(--text-secondary);
}

.card-header h5 i {
    margin-right: 6px;
    color: var(--primary-light);
}

/* Card Body */
.card-body {
    padding: 20px !important;
}

/* ========================================
   Textarea
   ======================================== */
.form-control {
    border: 1.5px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 15px;
    line-height: 1.6;
    background: var(--bg-input);
    color: var(--text-primary);
    resize: vertical;
    width: 100%;
    transition: border-color var(--transition), box-shadow var(--transition);
    -webkit-appearance: none;
}

.form-control:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(255, 107, 129, 0.12);
    background: #fff;
    color: var(--text-primary);
    outline: none;
}

.form-control::placeholder {
    color: var(--text-muted);
}

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

/* Button Group */
.button-group {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    justify-content: center;
}

/* Primary Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
    font-weight: 700;
    padding: 12px 36px;
    border-radius: var(--radius-pill);
    font-size: 15px;
    letter-spacing: 0.3px;
    cursor: pointer;
    background: linear-gradient(135deg, var(--primary) 0%, #ff8fa3 100%);
    color: #fff;
    box-shadow: var(--shadow-btn);
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(255, 107, 129, 0.45);
    color: #fff;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-btn);
}

.btn-primary i {
    font-size: 16px;
}

.btn:disabled,
.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Header Actions */
.header-actions {
    display: flex;
    gap: 6px;
    align-items: center;
}

/* Icon Button */
.download-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: 1.5px solid var(--border-light);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    line-height: 1;
    transition: all var(--transition);
}

.download-icon-btn:hover {
    background: var(--bg-input);
    border-color: var(--primary-light);
    color: var(--primary);
    transform: translateY(-1px);
}

.download-icon-btn:active {
    transform: translateY(0);
}

.download-icon-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

/* ========================================
   Preview Section
   ======================================== */
.card-body.p-0 {
    padding: 0 !important;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.preview-wrapper {
    background: var(--bg-preview);
    padding: 8px 0;
    min-height: 200px;
    overflow: hidden;
    width: 100%;
    position: relative;
}

.preview-container {
    background: transparent;
    border: none;
    height: auto;
    min-height: 200px;
    overflow: visible;
    padding: 0;
    display: block;
    margin: 0 auto;
}

#htmlPreview {
    margin: 0 auto;
    padding: 0;
    overflow: visible;
    background-color: transparent;
    position: relative;
}

#htmlPreview iframe {
    display: block;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 24px;
    background: transparent;
}

.empty-state i {
    font-size: 2.8rem;
    margin-bottom: 12px;
    color: var(--primary-light);
    opacity: 0.5;
    display: block;
}

.empty-state p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--text-muted);
    font-weight: 400;
}

.empty-state p.mb-2 {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 6px !important;
}

/* ========================================
   Loading
   ======================================== */
.loading {
    display: none;
    text-align: center;
    padding: 30px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

.loading.active {
    display: block;
    animation: fadeIn 0.25s var(--ease);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, -50%) scale(0.96); }
    to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.spinner-border {
    width: 2.4rem;
    height: 2.4rem;
    border-width: 3px;
    border-color: var(--primary-light);
    border-right-color: transparent;
    animation: spin 0.75s linear infinite;
}

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

.loading p {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    margin-top: 12px !important;
}

/* ========================================
   Alert
   ======================================== */
.alert-danger {
    background: #fff5f5;
    border: 1px solid #ffd4d4;
    color: #d63031;
    border-radius: var(--radius-sm);
}

/* ========================================
   Footer
   ======================================== */
footer {
    margin-top: auto !important;
    padding: 24px 0 !important;
}

footer small {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.8rem;
}

footer .bi-heart-fill {
    color: var(--primary) !important;
}

/* ========================================
   Scrollbar
   ======================================== */
::-webkit-scrollbar {
    width: 5px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(180, 160, 170, 0.4);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(180, 160, 170, 0.6);
}

/* ========================================
   Responsive
   ======================================== */

/* Tablet */
@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
    }

    header {
        margin-bottom: 24px !important;
    }

    header h1 {
        font-size: 1.7rem;
    }

    .card-body {
        padding: 16px !important;
    }

    .btn-primary {
        padding: 11px 28px;
        font-size: 14px;
        width: 100%;
    }

    .button-group {
        margin-top: 12px;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .container {
        padding: 14px 12px;
    }

    header h1 {
        font-size: 1.45rem;
    }

    header .lead {
        font-size: 0.85rem;
    }

    .form-control {
        font-size: 14px;
        padding: 10px 14px;
    }

    .empty-state {
        padding: 40px 16px;
    }

    .empty-state i {
        font-size: 2.2rem;
    }

    .card-header {
        padding: 12px 16px;
    }

    .card-header h5 {
        font-size: 0.82rem;
    }

    .download-icon-btn {
        width: 30px;
        height: 30px;
        font-size: 14px;
    }
}

/* ========================================
   Code Modal 生成码弹窗
   ======================================== */
.code-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(3px);
}

.code-modal-overlay.active {
    display: flex;
    animation: fadeInModal 0.25s ease;
}

@keyframes fadeInModal {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.code-modal {
    background: #fff;
    border-radius: 18px;
    width: 380px;
    max-width: 92vw;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.22);
    animation: slideUpModal 0.3s ease;
}

@keyframes slideUpModal {
    from { transform: translateY(30px); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}

/* 顶部渐变横幅 */
.code-modal-banner {
    background: linear-gradient(135deg, #ff9a7b 0%, #ff6b8a 50%, #c44dff 100%);
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.code-modal-banner-text {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
}

.code-modal-banner-icon {
    font-size: 1.3rem;
}

.code-modal-close {
    background: rgba(255,255,255,0.2);
    border: none;
    color: #fff;
    font-size: 1.5rem;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.code-modal-close:hover {
    background: rgba(255,255,255,0.35);
}

/* 赞赏码图片区域 */
.code-modal-qr {
    padding: 24px 20px 16px;
    display: flex;
    justify-content: center;
}

.code-modal-qr img {
    width: 200px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.10);
}

/* 输入区 */
.code-modal-input-area {
    padding: 0 24px 24px;
}

.code-modal-input-row {
    display: flex;
    align-items: center;
    gap: 0;
    background: #f7f5f8;
    border-radius: 12px;
    border: 1.5px solid #ede7eb;
    overflow: hidden;
    transition: border-color 0.2s;
}

.code-modal-input-row:focus-within {
    border-color: #ff6b81;
    box-shadow: 0 0 0 3px rgba(255, 107, 129, 0.10);
}

.code-modal-key-icon {
    padding: 0 10px 0 14px;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.code-modal-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 12px 8px;
    font-size: 0.95rem;
    color: #1f1b24;
    outline: none;
    min-width: 0;
}

.code-modal-input::placeholder {
    color: #bbb;
}

.code-modal-submit-btn {
    flex-shrink: 0;
    background: linear-gradient(135deg, #ff7e5f 0%, #c44dff 100%);
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: opacity 0.2s, transform 0.15s;
}

.code-modal-submit-btn:hover {
    opacity: 0.88;
    transform: translateY(-1px);
}

.code-modal-submit-btn:active {
    transform: translateY(0);
    opacity: 1;
}

.code-modal-hint {
    text-align: center;
    color: #aaa;
    font-size: 0.8rem;
    margin: 14px 0 4px;
}

.code-modal-contact {
    text-align: center;
    color: #888;
    font-size: 0.82rem;
    margin: 0;
}

.code-modal-contact strong {
    color: #ff6b81;
    font-weight: 700;
}

/* 生成码错误抖动动画 */
@keyframes shakeInput {
    0%, 100% { transform: translateX(0); }
    20%       { transform: translateX(-6px); }
    40%       { transform: translateX(6px); }
    60%       { transform: translateX(-5px); }
    80%       { transform: translateX(5px); }
}

.code-modal-input-row.shake {
    animation: shakeInput 0.4s ease;
    border-color: #ff4d4f;
}

/* 免费生成按钮区域 */
.code-modal-free-area {
    margin-top: 14px;
    text-align: center;
}

.code-modal-free-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #ffb347 0%, #ff6b81 100%);
    color: #fff;
    border: none;
    border-radius: 100px;
    padding: 10px 32px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(255, 179, 71, 0.35);
    transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}

.code-modal-free-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 179, 71, 0.45);
}

.code-modal-free-btn:active {
    transform: translateY(0);
    opacity: 0.9;
}

.code-modal-free-count {
    margin: 8px 0 0;
    font-size: 0.8rem;
    color: #aaa;
}

.code-modal-free-count strong {
    color: #ff6b81;
    font-weight: 700;
}