:root {
    --bg-deep: #030712;
    --bg-panel: #0b0f19;
    --bg-card: rgba(15, 23, 42, 0.72);
    --bg-hover: rgba(30, 41, 59, 0.6);
    --border-subtle: rgba(148, 163, 184, 0.12);
    --border-active: rgba(56, 189, 248, 0.35);
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent-red: #ef4444;
    --accent-red-deep: #7f1d1d;
    --accent-cyan: #38bdf8;
    --accent-cyan-deep: #0284c7;
    --accent-gold: #f59e0b;
    --accent-purple: #8b5cf6;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 60px rgba(56, 189, 248, 0.08);
    --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-serif: "Noto Serif SC", "Songti SC", serif;
}

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

html, body {
    height: 100%;
    font-family: var(--font-sans);
    background: var(--bg-deep);
    color: var(--text-primary);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 环境光效 */
.ambient-light {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.18;
    pointer-events: none;
    z-index: 0;
}

.ambient-light-1 {
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--accent-cyan) 0%, transparent 70%);
    top: -20vw;
    right: -15vw;
}

.ambient-light-2 {
    width: 45vw;
    height: 45vw;
    background: radial-gradient(circle, var(--accent-red) 0%, transparent 70%);
    bottom: -15vw;
    left: -10vw;
}

/* 认证弹窗 */
.auth-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-modal.hidden {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.auth-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(3, 7, 18, 0.82);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.auth-card {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 42px 36px 36px;
    box-shadow: var(--shadow-soft), var(--shadow-glow);
    text-align: center;
    overflow: hidden;
}

.auth-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-red), var(--accent-cyan), var(--accent-purple));
}

.auth-logo {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 1.5px;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-tagline {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.auth-title {
    font-size: 22px;
    font-weight: 600;
    margin-top: 28px;
    margin-bottom: 8px;
}

.auth-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 28px;
}

.auth-form {
    text-align: left;
}

.input-group {
    display: flex;
    align-items: center;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.input-group:focus-within {
    border-color: var(--border-active);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.1);
}

.input-prefix {
    padding: 0 14px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    border-right: 1px solid var(--border-subtle);
    user-select: none;
}

.phone-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 16px 14px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: var(--font-sans);
}

.phone-input::placeholder {
    color: var(--text-muted);
}

.auth-error {
    min-height: 22px;
    margin-top: 10px;
    font-size: 13px;
    color: var(--accent-red);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.auth-error.visible {
    opacity: 1;
}

.auth-button {
    width: 100%;
    margin-top: 10px;
    padding: 16px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-red-deep), var(--accent-red));
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.auth-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(239, 68, 68, 0.3);
}

.auth-button:active {
    transform: translateY(0);
}

.auth-button.loading .btn-text {
    opacity: 0;
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.auth-button.loading .btn-loader {
    opacity: 1;
}

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

.auth-footer {
    margin-top: 24px;
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

/* 主应用 */
.app {
    position: relative;
    z-index: 1;
    height: 100vh;
    display: flex;
    flex-direction: column;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.app.hidden {
    opacity: 0;
    pointer-events: none;
}

/* 顶部导航 */
.topbar {
    flex-shrink: 0;
    height: 64px;
    background: rgba(11, 15, 25, 0.78);
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.topbar-inner {
    max-width: 1600px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #fff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-divider {
    width: 1px;
    height: 18px;
    background: var(--border-subtle);
}

.brand-sub {
    font-size: 13px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--border-subtle);
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.user-info.hidden {
    display: none;
}

.user-greeting {
    color: var(--text-primary);
    font-weight: 500;
}

.user-name {
    color: var(--accent-cyan);
    font-weight: 600;
}

.user-divider {
    width: 1px;
    height: 14px;
    background: var(--border-subtle);
}

.user-expiry {
    color: var(--text-muted);
    font-size: 12px;
}

.user-expiry span {
    color: var(--text-secondary);
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-active);
}

/* 主布局 */
.main-layout {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

/* 顶部日期选择栏（横向滚动） */
.sidebar {
    width: 100%;
    flex-shrink: 0;
    background: rgba(11, 15, 25, 0.55);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    padding-right: 8px;
    border-right: 1px solid var(--border-subtle);
}

.sidebar-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.today-badge {
    font-size: 10px;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 20px;
    background: rgba(239, 68, 68, 0.12);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.2);
    white-space: nowrap;
}

.date-list {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 4px 4px 4px 12px;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE 10+ */
}

.date-list::-webkit-scrollbar {
    display: none;
}

.date-item {
    flex-shrink: 0;
    min-width: 76px;
    padding: 10px 16px;
    text-align: center;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
}

.date-item:hover {
    background: var(--bg-hover);
    border-color: var(--border-subtle);
}

.date-item.active {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--border-active);
    color: var(--text-primary);
}

.date-label {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.1;
}

.date-item.active .date-label {
    color: var(--accent-cyan);
}

.date-year {
    font-size: 10px;
    color: var(--text-muted);
    opacity: 0.7;
}

.date-item.active .date-year {
    color: var(--accent-cyan);
    opacity: 0.9;
}

.date-arrow {
    display: none;
}

.date-skeleton {
    flex-shrink: 0;
    width: 64px;
    height: 44px;
    border-radius: var(--radius-md);
    background: linear-gradient(90deg, rgba(30, 41, 59, 0.4) 25%, rgba(30, 41, 59, 0.7) 50%, rgba(30, 41, 59, 0.4) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 内容区 */
.content {
    flex: 1;
    overflow-y: auto;
    padding: 28px 36px 140px;
    scroll-behavior: smooth;
}

.content::-webkit-scrollbar {
    width: 6px;
}

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

.content::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.2);
    border-radius: 10px;
}

.empty-state {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 56px;
    margin-bottom: 20px;
    opacity: 0.8;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.empty-state p {
    font-size: 14px;
}

/* 报告文章 */
.report-article {
    max-width: 880px;
    margin: 0 auto;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.report-header {
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.report-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 13px;
}

.report-date {
    color: var(--accent-cyan);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.report-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-muted);
}

.report-count {
    color: var(--text-muted);
}

.report-title {
    font-family: var(--font-serif);
    font-size: 34px;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.report-subtitle {
    font-size: 15px;
    color: var(--text-muted);
    font-weight: 400;
}

/* 音频面板 */
.audio-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-soft);
}

.audio-panel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.audio-icon {
    font-size: 16px;
}

.audio-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 14px;
}

.audio-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: 20px;
    border: 1px solid var(--border-subtle);
    background: rgba(30, 41, 59, 0.5);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.audio-chip:hover {
    background: var(--bg-hover);
    border-color: var(--border-active);
}

.audio-chip.active {
    background: rgba(56, 189, 248, 0.12);
    border-color: var(--border-active);
    color: var(--accent-cyan);
    box-shadow: 0 0 16px rgba(56, 189, 248, 0.12);
}

.audio-chip-badge {
    font-size: 11px;
    padding: 2px 7px;
    border-radius: 10px;
    background: rgba(148, 163, 184, 0.15);
}

.audio-chip.active .audio-chip-badge {
    background: rgba(56, 189, 248, 0.2);
}

.audio-player-bar {
    display: flex;
    align-items: center;
    gap: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border-subtle);
}

.play-pause-btn {
    width: 46px;
    height: 46px;
    flex-shrink: 0;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.play-pause-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.3);
}

.player-icon {
    width: 22px;
    height: 22px;
}

.player-progress {
    flex: 1;
}

.progress-track {
    height: 5px;
    background: rgba(148, 163, 184, 0.15);
    border-radius: 3px;
    overflow: hidden;
    cursor: pointer;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 3px;
    transition: width 0.1s linear;
}

.player-time {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

/* 视图切换 */
.view-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
    padding: 6px;
    background: rgba(11, 15, 25, 0.6);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    width: fit-content;
}

.view-tab {
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.view-tab:hover {
    color: var(--text-secondary);
    background: var(--bg-hover);
}

.view-tab.active {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-cyan);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* 报告正文 */
.report-body {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: var(--shadow-soft);
}

.view-content {
    display: none;
    font-size: 16px;
    line-height: 1.85;
    color: var(--text-secondary);
}

.view-content.active {
    display: block;
}

.view-content h1,
.view-content h2,
.view-content h3 {
    font-family: var(--font-serif);
    color: var(--text-primary);
    margin-top: 1.6em;
    margin-bottom: 0.7em;
    font-weight: 700;
}

.view-content h1 { font-size: 26px; }
.view-content h2 { font-size: 22px; }
.view-content h3 { font-size: 18px; }

.view-content p {
    margin-bottom: 1.1em;
}

.view-content ul,
.view-content ol {
    margin-bottom: 1.1em;
    padding-left: 1.6em;
}

.view-content li {
    margin-bottom: 0.45em;
}

.view-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.view-content blockquote {
    margin: 1.4em 0;
    padding: 14px 20px;
    border-left: 3px solid var(--accent-cyan);
    background: rgba(56, 189, 248, 0.06);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}

.report-disclaimer {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 2.5em;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.2);
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.6;
}

.report-disclaimer svg {
    flex-shrink: 0;
    margin-top: 2px;
    color: #fbbf24;
}

.report-bottom-spacer {
    height: 48px;
}

.view-content hr {
    border: none;
    height: 1px;
    background: var(--border-subtle);
    margin: 2em 0;
}

.view-content code {
    font-family: "SF Mono", Consolas, monospace;
    font-size: 0.88em;
    padding: 2px 6px;
    background: rgba(148, 163, 184, 0.12);
    border-radius: 4px;
    color: var(--accent-cyan);
}

/* 链接卡片（原始情报中的 URL） */
.source-link {
    display: block;
    padding: 14px 18px;
    margin: 12px 0;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: rgba(30, 41, 59, 0.4);
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
    word-break: break-all;
}

.source-link:hover {
    background: var(--bg-hover);
    border-color: var(--border-active);
}

/* 工具类 */
.hidden {
    display: none !important;
}

/* 响应式 */
@media (max-width: 900px) {
    .content {
        padding: 20px 20px 160px;
    }

    .report-title {
        font-size: 26px;
    }

    .report-body {
        padding: 22px;
    }

    .view-tabs {
        width: 100%;
        overflow-x: auto;
    }

    .sidebar {
        padding: 10px 12px;
    }

    .sidebar-title {
        font-size: 12px;
    }

    .date-label {
        font-size: 15px;
    }
}

@media (max-width: 680px) {
    .user-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
        padding: 4px 8px;
        font-size: 11px;
    }

    .user-divider {
        display: none;
    }

    .user-greeting {
        font-size: 12px;
    }

    .user-expiry {
        font-size: 10px;
        color: var(--text-muted);
    }
}

@media (max-width: 520px) {
    .topbar-inner {
        padding: 0 16px;
    }

    .brand-sub {
        display: none;
    }

    .content {
        padding: 16px 16px 180px;
    }

    .report-title {
        font-size: 22px;
    }

    .report-body {
        padding: 18px;
    }

    .auth-card {
        padding: 32px 24px 28px;
    }
}

/* ================= 体验页样式 ================= */
.demo-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.demo-layout {
    flex: 1;
    flex-direction: column;
    padding-top: 0;
}

.demo-login-link {
    color: var(--accent-cyan);
    font-size: 13px;
    text-decoration: none;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(34, 211, 238, 0.25);
    transition: all 0.2s ease;
}

.demo-login-link:hover {
    background: rgba(34, 211, 238, 0.1);
}

.demo-sidebar {
    flex-direction: column;
    align-items: stretch;
    flex-shrink: 0;
    height: auto;
    padding: 20px;
}

.demo-info {
    margin-top: 16px;
}

.demo-date {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-family: var(--font-serif);
}

.demo-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.demo-cta {
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.25);
    border-radius: var(--radius-md);
    padding: 14px;
    text-align: center;
}

.demo-cta span {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.demo-btn {
    display: inline-block;
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    padding: 8px 18px;
    border-radius: 20px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.demo-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.35);
}

.demo-footer-banner {
    margin-top: 32px;
    margin-bottom: 60px;
    padding: 18px 20px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.12) 0%, rgba(59, 130, 246, 0.08) 100%);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-md);
}

.demo-banner-inner {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.demo-banner-icon {
    font-size: 24px;
}

.demo-banner-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.demo-banner-text strong {
    color: var(--text-primary);
    font-size: 15px;
}

.demo-banner-text span {
    color: var(--text-secondary);
    font-size: 12px;
}

.demo-banner-btn {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    padding: 9px 18px;
    border-radius: 20px;
    text-decoration: none;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.demo-banner-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.35);
}

@media (max-width: 900px) {
    .demo-layout {
        flex-direction: column;
    }

    .demo-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
        padding: 16px;
    }

    .demo-info {
        margin-top: 0;
    }

    .demo-date {
        font-size: 22px;
    }

    .demo-banner-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}