/* ===== 变量 ===== */
:root {
    --bg: #1a1a1a;
    --card-bg: #252525;
    --accent: #00d4aa;
    --accent-hover: #33ffe0;
    --accent-glow: rgba(0, 212, 170, 0.3);
    --green: #4ecdc4;
    --text: #e0e0e0;
    --text-muted: #888;
    --border: #3a3a3a;
    --radius: 12px;
}

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

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-weight: 300;
    letter-spacing: 0.25em;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== 导航栏 ===== */
.navbar {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-size: 1.2rem;
    font-weight: 200;
    letter-spacing: 0.4em;
    color: var(--text);
    text-decoration: none;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}
.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-btn {
    background: var(--accent);
    color: white !important;
    padding: 8px 18px;
    border-radius: 6px;
    font-weight: 400;
}
.nav-btn:hover { background: var(--accent-hover); }
.nav-btn-outline {
    border: 1px solid var(--border);
    padding: 8px 18px;
    border-radius: 6px;
}
.nav-points {
    background: rgba(78, 205, 196, 0.12);
    color: var(--green) !important;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 400;
}

/* ===== Toast 悬浮提示 ===== */
.toast-container {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}
.toast {
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 300;
    letter-spacing: 0.25em;
    white-space: nowrap;
    pointer-events: auto;
    animation: toastIn 0.35s ease;
    backdrop-filter: blur(12px);
}
.toast-out {
    animation: toastOut 0.3s ease forwards;
}
.toast-success { background: rgba(78,205,196,0.15); color: var(--green); border: 1px solid rgba(78,205,196,0.3); }
.toast-error   { background: rgba(0,212,170,0.1); color: var(--accent-hover); border: 1px solid rgba(0,212,170,0.25); }
.toast-warning { background: rgba(243,156,18,0.15); color: #f39c12; border: 1px solid rgba(243,156,18,0.3); }
.toast-info    { background: rgba(100,149,237,0.15); color: #6495ed; border: 1px solid rgba(100,149,237,0.3); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(-16px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(-8px); }
}

/* ===== 按钮 ===== */
.btn {
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    font-weight: 400;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    letter-spacing: 0.2em;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-primary:disabled { background: #555; cursor: not-allowed; transform: none; }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 14px 36px; font-size: 1.05rem; }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-block { width: 100%; }

/* ===== 图片展示区 ===== */
.showcase {
    position: relative;
    width: 100%;
    height: 85vh;
    min-height: 500px;
    overflow: hidden;
}
.showcase-slider {
    width: 100%;
    height: 100%;
    position: relative;
}
.showcase-slide {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease;
}
.showcase-slide.active { opacity: 1; }
.showcase-image {
    width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
/* 叠加文字 */
.showcase-overlay {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    padding: 60px 20px 40px;
    background: linear-gradient(transparent, rgba(26,26,26,0.6) 50%, var(--bg));
    text-align: center;
    pointer-events: none;
}
.showcase-overlay h1 {
    font-size: 1.8rem;
    font-weight: 200;
    letter-spacing: 0.2em;
    margin-bottom: 16px;
    line-height: 1.3;
}
.gradient-text {
    background: linear-gradient(135deg, #00d4aa, #00e5ff, #00d4aa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 300;
}
.showcase-overlay p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 24px;
    letter-spacing: 0.25em;
}
.showcase-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    pointer-events: auto;
}
/* 轮播指示器 */
.showcase-dots {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}
.dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    cursor: pointer;
    transition: all 0.3s;
}
.dot.active { background: var(--accent); width: 24px; border-radius: 4px; }

/* ===== 功能介绍 ===== */
.features {
    max-width: 1000px;
    margin: 80px auto;
    padding: 0 20px;
    text-align: center;
}
.features h2 {
    font-size: 1.6rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    margin-bottom: 48px;
    color: var(--text);
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}
.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 24px;
    transition: transform 0.2s, border-color 0.2s;
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: #555;
}
.feature-icon { font-size: 2.5rem; display: block; margin-bottom: 14px; letter-spacing: 0; }
.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    margin-bottom: 8px;
}
.feature-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    line-height: 1.6;
}

/* ===== 套餐卡片 ===== */
.pricing-preview, .pricing-page {
    max-width: 1000px;
    margin: 0 auto 80px;
    padding: 0 20px;
    text-align: center;
}
.pricing-preview h2, .pricing-page h1 {
    font-size: 1.6rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    margin-bottom: 8px;
}
.pricing-sub { color: var(--text-muted); margin-bottom: 40px; font-size: 0.9rem; }
.package-grid, .package-grid-full {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}
.package-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 20px;
    position: relative;
    transition: transform 0.2s, border-color 0.2s;
}
.package-card:hover { transform: translateY(-3px); border-color: #555; }
.package-card.featured {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}
.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: white;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.15em;
}
.package-card h3 { font-size: 1.05rem; font-weight: 400; margin-bottom: 12px; }
.package-points { font-size: 2rem; font-weight: 300; color: var(--green); margin-bottom: 4px; letter-spacing: 0.1em; }
.package-price { font-size: 1.5rem; font-weight: 300; margin-bottom: 4px; letter-spacing: 0.1em; }
.package-desc, .package-per { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 16px; }
.pricing-cta { margin-top: 16px; }
.pricing-note { color: var(--text-muted); font-size: 0.85rem; margin-top: 40px; }

/* ===== 认证页面 ===== */
.auth-page {
    max-width: 440px;
    margin: 60px auto;
    padding: 0 20px;
}
.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
}
.auth-card h2 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.4rem;
    font-weight: 300;
    letter-spacing: 0.2em;
}
.auth-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.2em;
}
.form-group input {
    padding: 12px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    font-weight: 300;
    letter-spacing: 0.15em;
    transition: border-color 0.2s;
}
.form-group input:focus { outline: none; border-color: var(--accent); }
.form-errors {
    background: rgba(0, 212, 170, 0.08);
    border: 1px solid rgba(0, 212, 170, 0.2);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
}
.error-item { color: var(--accent-hover); font-size: 0.85rem; margin-bottom: 4px; }
.auth-switch {
    text-align: center;
    margin-top: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.auth-switch a { color: var(--accent); text-decoration: none; }

/* ===== 会员中心 ===== */
.dashboard { max-width: 1100px; margin: 0 auto; padding: 30px 20px 60px; }
.dash-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 30px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}
.dash-user h2 { font-size: 1.3rem; font-weight: 300; letter-spacing: 0.2em; margin-bottom: 2px; }
.dash-since { font-size: 0.8rem; color: var(--text-muted); }
.dash-balance {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--card-bg);
    padding: 14px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.balance-label { color: var(--text-muted); font-size: 0.85rem; }
.balance-value { font-size: 2rem; font-weight: 300; color: var(--green); letter-spacing: 0.1em; }
.balance-unit { color: var(--text-muted); font-size: 0.85rem; }
.dash-main {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
}
@media (max-width: 768px) {
    .dash-main { grid-template-columns: 1fr; }
}

/* ===== 转换面板 ===== */
.convert-panel {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px;
}
.convert-panel h3 { font-weight: 300; letter-spacing: 0.2em; margin-bottom: 4px; }
.convert-cost { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 20px; }

.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 50px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}
.upload-area:hover, .upload-area.drag-over {
    border-color: var(--accent);
    background: rgba(0, 212, 170, 0.04);
}
.upload-icon { font-size: 3rem; display: block; margin-bottom: 12px; letter-spacing: 0; }
.upload-text { font-size: 1rem; margin-bottom: 6px; }
.browse-link { color: var(--accent); text-decoration: underline; cursor: pointer; }
.upload-hint { font-size: 0.8rem; color: var(--text-muted); }

.preview-container { display: flex; align-items: center; gap: 20px; margin-bottom: 24px; }
@media (max-width: 600px) { .preview-container { flex-direction: column; } .preview-arrow { transform: rotate(90deg); } }
.preview-box { flex: 1; text-align: center; }
.preview-label { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 8px; }
.preview-box img { max-width: 100%; max-height: 250px; border-radius: 8px; border: 1px solid var(--border); }
.preview-arrow { font-size: 2rem; color: var(--accent); font-weight: 300; letter-spacing: 0; }
.result-placeholder {
    width: 100%; height: 200px;
    background: var(--bg); border-radius: 8px;
    border: 1px dashed var(--border);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted);
}

.action-buttons { text-align: center; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }
.convert-reminder { text-align: center; font-size: 0.85rem; color: var(--text-muted); }

.loading-section { text-align: center; padding: 40px 0; }
.spinner {
    width: 50px; height: 50px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 1rem; margin-bottom: 4px; }
.loading-hint { font-size: 0.8rem; color: var(--text-muted); }

.result-section { text-align: center; }
.result-label { font-size: 1.2rem; color: var(--green); margin-bottom: 8px; font-weight: 300; letter-spacing: 0.2em; }
.result-points-info { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }
.result-container img { max-width: 100%; max-height: 400px; border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 20px; }
.result-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.error-box { text-align: center; padding: 30px; background: rgba(0,212,170,0.06); border-radius: var(--radius); border: 1px solid rgba(0,212,170,0.15); }
.error-icon { font-size: 2rem; display: block; margin-bottom: 12px; letter-spacing: 0; }
.error-box p { color: var(--accent-hover); margin-bottom: 16px; }
.error-actions { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

/* ===== 历史面板 ===== */
.history-panel {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    max-height: 600px;
    overflow-y: auto;
}
.history-panel h3 { font-weight: 300; letter-spacing: 0.2em; margin-bottom: 16px; font-size: 1.05rem; }
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 12px;
    background: var(--bg);
    border-radius: 8px;
    border: 1px solid transparent;
}
.history-info { display: flex; flex-direction: column; gap: 2px; }
.history-filename { font-size: 0.85rem; max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.history-time { font-size: 0.7rem; color: var(--text-muted); }
.history-cost { color: var(--accent); font-weight: 400; font-size: 0.85rem; }
.history-empty { color: var(--text-muted); text-align: center; padding: 30px 0; font-size: 0.85rem; }

.save-warning {
    text-align: center;
    padding: 10px 16px;
    margin: 12px 0;
    background: rgba(243, 156, 18, 0.1);
    border: 1px solid rgba(243, 156, 18, 0.3);
    border-radius: 8px;
    color: #f39c12;
    font-size: 0.8rem;
    font-weight: 300;
    letter-spacing: 0.1em;
}

/* ===== 页脚 ===== */
.footer { text-align: center; padding: 40px 20px; border-top: 1px solid var(--border); margin-top: 40px; }
.footer p { color: var(--text-muted); font-size: 0.85rem; }
.footer-sub { font-size: 0.75rem; margin-top: 4px; opacity: 0.6; }

/* ===== Language Selector ===== */
.nav-lang {
    position: relative;
    display: inline-block;
    margin-left: 4px;
}
.lang-current {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 5px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-family: inherit;
    font-weight: 300;
    letter-spacing: 0.15em;
    transition: border-color 0.2s, color 0.2s;
    line-height: 1;
}
.lang-current:hover {
    border-color: var(--accent);
    color: var(--text);
}
.lang-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    min-width: 100px;
    overflow: hidden;
    z-index: 200;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.lang-dropdown.show {
    display: block;
}
.lang-dropdown a {
    display: block;
    padding: 9px 14px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    transition: background 0.15s, color 0.15s;
}
.lang-dropdown a:hover {
    background: rgba(0, 212, 170, 0.08);
    color: var(--text);
}
.lang-dropdown a.active {
    color: var(--accent);
    font-weight: 400;
}