/* Light Mode Promo Page Styles */

/* Base Reset — only what promo needs */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --promo-bg: #F8F8F6;
    /* Warm paper grey background */
    --promo-bg-alt: #EFEFEE;
    /* Soft contrasting grey */
    --promo-text-main: #2A2A28;
    /* Premium warm soot black */
    --promo-text-sub: #7C7C78;
    /* Elegant warm stone grey */
    --promo-text-paragraph: #3A3A37;
    /* Gentle paragraph ink grey for reading comfort */
    --promo-accent: #00D68F;
    /* Branding Blue (LOGO Color) */
    --promo-danger: #FF3B30;
    --card-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    --header-height: 60px;
}

html {
    scroll-behavior: auto;
}

body.promo-page {
    background-color: var(--promo-bg);
    color: var(--promo-text-main);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    overflow-x: hidden;
    padding-bottom: 0;
    /* Logo sits at the very bottom */
}

/* Header */
.promo-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    transition: transform 0.3s ease;
}

.promo-header.hidden {
    transform: translateY(-100%);
}

.promo-header .glass-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    z-index: -1;
}

.promo-header .logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
}

.promo-header .logo-icon {
    width: 36px;
    height: 36px;
    background: url('../images/logo.webp') no-repeat center center;
    background-size: contain;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.promo-header .logo-icon:hover {
    transform: scale(1.1);
}

.promo-header .logo-text {
    color: var(--promo-text-main);
    font-size: 1.2rem;
    font-weight: 700;
}

/* Hero Section */
.hero-section {
    padding-top: var(--header-height);
    /* Fix: Push video below header */
    text-align: center;
    padding-bottom: 0;
    /* No gap between video and tabs */
    background: var(--promo-bg);
    margin-bottom: -1px;
    /* Fix potential sub-pixel gap */
    position: relative;
    z-index: 10;
}

.video-container {
    width: 100%;
    max-width: 100%;
    /* Full bleed */
    margin: 0;
    position: relative;
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: 0;
    /* No corners */
    overflow: hidden;
    box-shadow: none;
    /* Flat design */
}

.video-poster-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    background-image: url('../images/video-poster.webp');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.4s ease-out, visibility 0.4s ease-out;
}

.video-poster-overlay.fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}


/* Elegant audio control badge */
.video-audio-badge {
    position: absolute;
    right: 20px;
    bottom: 20px;
    z-index: 101;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    pointer-events: auto;
    padding: 0;
}

.video-audio-badge:hover {
    background: rgba(0, 0, 0, 0.65);
    transform: scale(1.08);
    border-color: rgba(255, 255, 255, 0.45);
}

.video-audio-badge svg {
    display: block;
    pointer-events: none;
}

.hero-content {
    padding: 0 1.5rem;
}

.hero-content h1 {
    font-size: 2.2rem;
    line-height: 1.1;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--promo-text-main);
}

.hero-content .subtitle {
    font-size: 1rem;
    color: var(--promo-text-sub);
    max-width: 400px;
    margin: 0 auto;
    font-weight: 400;
}

/* Slogan Section */
.slogan-section {
    padding: 4.5rem 1.5rem;
    text-align: center;
    background: var(--promo-bg);
    will-change: opacity, transform;
    position: relative;
    z-index: 1;
}

/* Monolithic Charcoal Download Button for CTA */
.download-cta-btn {
    display: inline-block;
    margin-top: 28px;
    background: #11110F;
    color: #FFFFFF;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.08em;
    padding: 12px 38px;
    border-radius: 30px;
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(17, 17, 15, 0.08);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease, filter 0.3s ease;
}

.download-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(17, 17, 15, 0.16);
    filter: brightness(1.15);
    color: #FFFFFF;
}

.download-cta-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 8px rgba(17, 17, 15, 0.1);
}


.slogan-section h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--promo-text-main);
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
    line-height: 1.4;
}

.slogan-prologue {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--promo-text-main);
    letter-spacing: 3px;
    text-align: center;
    margin-bottom: 1rem;
}

.slogan-section p {
    font-size: 1.1rem;
    color: var(--promo-text-sub);
    font-family: -apple-system, BlinkMacSystemFont, "SF Mono", monospace;
    /* Mono font for 'code' feel */
    letter-spacing: 0.5px;
}

/* Section Divider — subtle gradient band between chapters */
.section-divider {
    height: 1px;
    max-width: 200px;
    margin: 0 auto;
    background: linear-gradient(to right, transparent, rgba(0, 0, 0, 0.15), transparent);
}

/* Section Navigation - Slate Monochrome Ink Slide */
.section-nav {
    position: sticky;
    top: var(--header-height);
    z-index: 900;
    width: 100%;
    max-width: 100%;
    margin: 0;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 0;
    box-shadow: none;
    padding: 0.9rem 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.2rem;
}

.nav-link {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: #9E9E9A;
    transition: color 0.3s ease, font-weight 0.2s ease;
    white-space: nowrap;
    position: relative;
    padding: 4px 0 10px 0;
    text-align: center;
    line-height: 1.2;
}

.nav-link.active {
    color: #11110F;
    font-weight: 600;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 100%;
    height: 1px;
    background-color: #2A2A28;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-link:hover {
    color: var(--promo-text-main);
}

.nav-link.active {
    color: var(--promo-text-main);
}

/* Section Titles */
.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--promo-text-main);
    letter-spacing: -0.5px;
}

/* Poster Image Block - replaces text question */
.poster-block {
    max-width: 380px;
    margin: 0 auto 4rem;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.poster-block img {
    width: 100%;
    height: auto;
    display: block;
}

/* Package Zoom Effect */
.package-block {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    max-width: 500px;
    margin: 0 auto 3rem;
    padding-bottom: 56.25%;
}

.package-zoom {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.package-img {
    width: 100%;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    transform-origin: 60% 30%;
    transition: transform 0.1s linear;
    will-change: transform;
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
}

/* Security Tray Zoom Effect */
.security-tray-block {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    max-width: 500px;
    margin: 0 auto 3rem;
    padding-bottom: 56.25%;
    /* 16:9 aspect ratio */
}

.security-tray-zoom {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.security-tray-img {
    width: 100%;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    transform-origin: 25% 55%;
    /* Hardware wallet position in the image */
    transition: transform 0.1s linear;
    will-change: transform;
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
}

/* Drawer: scroll-driven dark overlay */
.drawer-block {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    max-width: 500px;
    margin: 0 auto 3rem;
    padding-bottom: 56.25%;
    /* 16:9 aspect ratio */
}

.drawer-zoom {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.drawer-img {
    width: 100%;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
    z-index: 0;
}

.drawer-dark-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    opacity: 0;
    pointer-events: none;
    z-index: 3;
}

/* Countdown Quote - dramatic centered question (obsolete, kept for reference) */
.countdown-quote,
.day-label,
.final-question,
.subtitle-center {
    display: none;
}

/* Day Section - question first, then answer */
.chapter-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--promo-text-main);
    letter-spacing: 3px;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 3rem;
    padding: 0.3rem 1rem;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 20px;
    display: inline-block;
}

.day-section {
    padding: 4rem 1.5rem 5rem;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    margin: 0 auto;
    scroll-margin-top: calc(var(--header-height) + 80px);
}

.question-block {
    text-align: center;
    margin-bottom: 3rem;
}

.day-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--promo-accent);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 1rem;
    padding: 0.3rem 1rem;
    border: 1px solid rgba(0, 214, 143, 0.3);
    border-radius: 20px;
}

/* Answer Block */
.answer-block {
    text-align: center;
    margin: 4rem 0 3rem;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.answer-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--promo-text-main);
    line-height: 1.5;
    margin: 0 0 1.5rem;
}

.answer-quote {
    margin: 0 0 1.5rem;
    padding: 0;
    background: transparent;
    border-radius: 0;
    border: none;
    box-shadow: none;
    text-align: center;
}

.quote-mark {
    display: none;
}

.quote-content {
    font-size: 1rem;
    font-weight: 600;
    color: var(--promo-text-main);
    line-height: 1.5;
    letter-spacing: 1px;
}

.quote-latin {
    display: block;
    margin-top: 1.2rem;
    font-size: 0.8rem;
    color: var(--promo-text-sub);
    font-style: italic;
    font-family: Georgia, serif;
    letter-spacing: 0.5px;
}

.quote-author {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.75rem;
    color: var(--promo-text-sub);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.answer-hidden {
    display: none;
}

/* Reading progress bar */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 9999;
    background: transparent;
}
.reading-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--promo-accent);
    transition: width 0.1s linear;
}

/* Scroll to bottom button */
.scroll-to-bottom {
    position: fixed;
    bottom: 30px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: var(--promo-accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 999;
}
.scroll-to-bottom.visible {
    opacity: 1;
    visibility: visible;
}

/* Bottom decorative logo */
.bottom-logo {
    width: 100%;
    display: flex;
    justify-content: center;
}
.bottom-logo img {
    height: 80px;
    width: auto;
    opacity: 0.06;
    filter: grayscale(1) brightness(0.5);
}

/* ========================================
   Article Typography — Mobile Long-Form Reading
   Reference: 17px body, 1.7 line-height, 24px paragraph spacing
   ======================================== */

/* Body font: system font stack for best rendering + fast loading */
.answer-detail {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", STHeiti, "Microsoft Yahei", Tahoma, Simsun, sans-serif;
    font-size: 17px;
    color: var(--promo-text-paragraph);
    line-height: 1.85;
    letter-spacing: 0.04em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    word-break: break-word;
    overflow-wrap: break-word;
    line-break: strict;
}

/* Paragraphs — 17px / 1.85 line-height / 28px bottom margin */
.answer-detail p {
    font-size: 17px;
    line-height: 1.85;
    margin: 0 0 28px;
    /* Natural left align for mobile reading comfort */
    text-align: left;
    color: var(--promo-text-paragraph);
    /* Avoid word wrap issues for long strings */
    word-break: break-word;
    overflow-wrap: break-word;
    /* Enable subpixel font smoothing on iOS */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.answer-detail p:last-child {
    margin-bottom: 0;
}

/* Article main title (H1 equivalent) — Re-imagined in pure, elegant large typography */
.answer-block .answer-text {
    font-family: 'Georgia', -apple-system, BlinkMacSystemFont, "PingFang SC", serif;
    font-size: 26px;
    line-height: 1.4;
    font-weight: 600;
    color: var(--promo-text-main);
    margin: 48px 0 24px;
    letter-spacing: 0.02em;
    text-align: left !important;
}

/* Section subtitle (H2 equivalent) — 20px with custom divider for breathability */
.answer-detail .section-title {
    font-size: 20px;
    line-height: 1.4;
    font-weight: 600;
    color: var(--promo-text-main);
    margin: 48px 0 16px;
    padding-top: 24px;
    border-top: 1px solid rgba(42, 42, 40, 0.06);
    letter-spacing: -0.2px;
}

/* Highlight core concepts slightly larger and bolder */
.highlight-concept {
    font-size: 1.12em;
    font-weight: 700;
    color: var(--promo-text-main);
}

/* Premium Blockquote styling for signature quotes */
.quote-block {
    margin: 36px auto;
    text-align: center;
    width: 100%;
    display: block;
}

.quote-block .quote-text {
    font-family: 'Georgia', 'STKaiti', 'KaiTi', 'Noto Serif SC', serif;
    font-size: 18px;
    font-weight: 300;
    line-height: 1.6;
    letter-spacing: 0.12em;
    color: var(--promo-text-main);
    margin: 0 0 8px 0 !important;
    text-align: center !important;
}

.quote-block .quote-author {
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.06em;
    color: #7A7A76;
    margin: 0 !important;
    text-align: center !important;
}

/* Remove border-top for the first subsection title to prevent layout overlap */
.answer-detail .section-title:first-of-type {
    border-top: none;
    padding-top: 0;
    margin-top: 24px;
}

/* Elegant geometric prefix numbers */
.section-num {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 22px;
    font-weight: 300;
    color: #7A7A76;
    margin-right: 0.6rem;
}

/* Lists inside article */
.answer-detail ul,
.answer-detail ol {
    margin: 0 0 24px;
    padding-left: 1.4rem;
}

.answer-detail li {
    font-size: 16px;
    line-height: 1.7;
    margin: 0 0 12px;
}

.answer-detail li:last-child {
    margin-bottom: 0;
}

/* Container: center content with max-width and screen edge padding */
.answer-detail,
.answer-block .answer-text {
    padding-left: 20px;
    padding-right: 20px;
}

@media (min-width: 769px) {
    .answer-block {
        max-width: 680px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 20px;
        padding-right: 20px;
    }
    .answer-block .answer-text {
        font-size: 22px;
    }
    .video-container {
        max-width: 1080px;
        margin: 40px auto 0;
        border-radius: 24px;
        border: 1px solid rgba(0, 0, 0, 0.06);
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
        overflow: hidden;
    }
    .video-poster-overlay {
        border-radius: 24px;
    }
}

.answer-tagline {
    display: inline-block;
    margin-top: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--promo-accent);
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.4rem 1rem;
    border: 1px solid rgba(0, 214, 143, 0.3);
    border-radius: 20px;
}

/* Feature Visual Cards */
.feature-visual {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 2.5rem;
    justify-items: center;
}

.feature-visual .visual-card {
    max-width: 320px;
    width: 100%;
}

@media (min-width: 768px) {
    .feature-visual {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
    .feature-visual .visual-card {
        max-width: none;
    }
}

.visual-card {
    background: #FFFFFF;
    padding: 2.5rem 2rem;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1), box-shadow 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.visual-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1), color 0.4s ease;
    opacity: 0.8;
    color: var(--promo-text-main);
    display: flex;
    justify-content: center;
}

.visual-card .icon svg {
    width: 3rem;
    height: 3rem;
    stroke: currentColor;
    stroke-width: 1.2px;
}

.visual-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

.visual-card:hover .icon {
    transform: scale(1.05);
    opacity: 1;
    color: var(--promo-accent);
}

.visual-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 0.8rem;
    color: var(--promo-text-main);
}

.visual-card p {
    font-size: 0.95rem;
    color: var(--promo-text-sub);
    margin: 0;
    line-height: 1.5;
}

/* Phone Tray - horizontal scroll */
.phone-tray {
    margin-top: 2rem;
    overflow: hidden;
    mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
}

.phone-tray-grid {
    display: flex;
    gap: 1.2rem;
    padding: 1.5rem 0;
    animation: phone-scroll 20s linear infinite;
    width: max-content;
    margin: 0 auto;
    align-items: center;
}

@keyframes phone-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.tray-phone {
    width: 64px;
    flex-shrink: 0;
}

.tray-phone img {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.12));
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease;
}

.tray-phone.hardware-wallet {
    /* container keeps 64px width, only image shrinks */
}

.tray-phone.hardware-wallet img {
    width: 65%;
    margin: 0 auto;
}

.tray-phone.morphing {
    perspective: 400px;
}

.tray-phone.morphing img {
    transform: rotateY(90deg);
    opacity: 0;
}

@media (max-width: 480px) {
    .poster-block {
        max-width: 300px;
    }
    .phone-tray-grid {
        gap: 0.8rem;
        animation-duration: 15s;
    }
    .tray-phone {
        width: 48px;
    }
    .tray-phone.hardware-wallet img {
        width: 65%;
    }
}

/* Evidence Wall - horizontal carousel */
.evidence-wall {
    margin: 0 auto 3rem;
    max-width: 720px;
    position: relative;
}

.evidence-wall::before {
    content: '← 滑动查看更多案例 →';
    display: block;
    text-align: center;
    font-size: 0.75rem;
    color: #86868B;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
}

.evidence-stack {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 1rem;
    padding: 0.5rem 0 1rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.evidence-stack::-webkit-scrollbar {
    display: none;
}

.evidence-card {
    flex: 0 0 85%;
    max-width: 580px;
    scroll-snap-align: center;
    background: #fff;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    text-align: left;
}

.evidence-card + .evidence-card {
    margin-top: 0;
}

.evidence-card::before,
.evidence-card::after {
    display: none;
}

.evidence-stack:not(.expanded) {
    height: auto;
}

.evidence-stack:not(.expanded) .evidence-card {
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    height: auto;
    padding: 1.5rem 1.5rem 1.8rem;
    transform: none !important;
    z-index: auto !important;
    transition-delay: 0s !important;
    border-radius: 16px;
}

.evidence-stack:not(.expanded) .evidence-card h4 {
    font-size: 0.9rem;
    line-height: 1.4;
}

.evidence-stack:not(.expanded) .evidence-card .evidence-date {
    display: block;
    font-size: 0.75rem;
    color: #86868B;
    line-height: 1.5;
    margin-top: 0.6rem;
    opacity: 1;
}

.evidence-stack.expanded .evidence-card {
    position: relative;
    padding: 2.5rem 2.5rem 2.8rem;
    border-radius: 20px;
    min-height: auto;
    height: auto;
    z-index: auto;
    transform: none;
    transition-delay: 0s;
}

a.evidence-card {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: box-shadow 0.2s ease;
}

a.evidence-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.evidence-card .evidence-date {
    display: block;
    opacity: 1;
    transition: none;
}

.evidence-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: #1D1D1F;
    line-height: 1.5;
    margin: 0 0 0.8rem;
    transition: color 0.2s ease;
}

a.evidence-card h4::after {
    content: ' ↗';
    font-size: 0.75em;
    color: #86868B;
    font-weight: 400;
    transition: color 0.2s ease;
}

a.evidence-card:hover h4::after {
    color: #CC0000;
}

/* Red seal stamp on card */
.evidence-seal {
    position: absolute;
    bottom: 0.8rem;
    right: 0.8rem;
    width: 72px;
    height: 72px;
    border: 3px solid #CC0000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 900;
    color: #CC0000;
    transform: rotate(-22deg);
    opacity: 0.9;
    pointer-events: none;
    letter-spacing: 4px;
    background: rgba(204, 0, 0, 0.08);
    border-style: double;
    border-width: 4px;
    box-shadow: inset 0 0 0 2px rgba(204, 0, 0, 0.2);
}

.evidence-seal::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    right: 3px;
    bottom: 3px;
    border: 1.5px solid rgba(204, 0, 0, 0.35);
    border-radius: 50%;
}

.evidence-date {
    display: block;
    font-size: 0.8rem;
    color: #86868B;
    line-height: 1.6;
    font-style: normal;
}

/* Interactive Parse Demo (Day 4) */
.interactive-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    margin-top: 2rem;
    user-select: none;
    -webkit-user-select: none;
}

@media (min-width: 768px) {
    .interactive-container {
        flex-direction: row;
        justify-content: center;
        align-items: center;
        gap: 4rem;
    }
}

.demo-image-wrapper {
    position: relative;
    max-width: 260px;
    width: 100%;
    aspect-ratio: 9 / 19.5;
}

.demo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    position: absolute;
    top: 0;
    left: 0;
}

.demo-img.blind {
    z-index: 1;
    opacity: 1;
    clip-path: inset(0 0 0 50%);
    will-change: clip-path;
}

.demo-img.clear {
    z-index: 1;
    opacity: 1;
    clip-path: inset(0 50% 0 0);
    will-change: clip-path;
}

.slider-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(255, 255, 255, 0.8);
    cursor: ew-resize;
    z-index: 10;
    pointer-events: auto;
    filter: drop-shadow(0 0 5px rgba(0, 0, 0, 0.5));
}

.handle-line {
    width: 100%;
    height: 100%;
}

.handle-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background: #000;
    border: 2px solid #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    pointer-events: auto;
}

.demo-label {
    position: absolute;
    bottom: 1.5rem;
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.55rem;
    font-weight: 700;
    color: #fff;
    pointer-events: none;
    z-index: 5;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: opacity 0.1s ease;
    white-space: nowrap;
}

@media (max-width: 480px) {
    .demo-image-wrapper {
        max-width: 220px;
    }
    .demo-label {
        font-size: 0.5rem;
        padding: 3px 6px;
        bottom: 1.5rem;
        letter-spacing: 0.3px;
        max-width: 40%;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .label-left { left: 0.25rem !important; }
    .label-right { right: 0.25rem !important; }
}

.label-left {
    left: 1rem;
    background: rgba(0, 214, 143, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transform-origin: left center;
}

.label-right {
    right: 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transform-origin: right center;
}

/* Poster Collage - 3D carousel */
.poster-collage-wrapper {
    width: 100%;
    overflow: hidden;
    margin: 0 auto 1rem;
    height: 340px;
    perspective: 1000px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.poster-collage {
    width: 260px;
    height: 340px;
    position: relative;
    transform-style: preserve-3d;
    animation: carousel-rotate 15s linear infinite;
}

@keyframes carousel-rotate {
    0% { transform: rotateY(0deg); }
    100% { transform: rotateY(360deg); }
}

.collage-item {
    width: 260px;
    height: 340px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    position: absolute;
}

.collage-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 5 items on a cylinder - each 72deg apart, radius 280px */
.collage-item:nth-child(1) { transform: rotateY(0deg) translateZ(280px); }
.collage-item:nth-child(2) { transform: rotateY(72deg) translateZ(280px); }
.collage-item:nth-child(3) { transform: rotateY(144deg) translateZ(280px); }
.collage-item:nth-child(4) { transform: rotateY(216deg) translateZ(280px); }
.collage-item:nth-child(5) { transform: rotateY(288deg) translateZ(280px); }

@media (max-width: 480px) {
    .poster-collage {
        width: 180px;
        height: 230px;
    }

    .collage-item {
        width: 180px;
        height: 230px;
    }

    .collage-item:nth-child(1) { transform: rotateY(0deg) translateZ(200px); }
    .collage-item:nth-child(2) { transform: rotateY(72deg) translateZ(200px); }
    .collage-item:nth-child(3) { transform: rotateY(144deg) translateZ(200px); }
    .collage-item:nth-child(4) { transform: rotateY(216deg) translateZ(200px); }
    .collage-item:nth-child(5) { transform: rotateY(288deg) translateZ(200px); }
}

/* Final Answer Section (Day 0) */
.final-section {
    text-align: center;
    padding: 5rem 1.5rem 0;
}

.final-question {
    font-size: 2rem;
    font-weight: 700;
    color: var(--promo-text-main);
    margin-bottom: 3rem;
    letter-spacing: -0.5px;
    line-height: 1.4;
}

.questions-recap {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 600px;
    margin: 0 auto 3rem;
    text-align: left;
}

.recap-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.2rem 1.5rem;
    background: #FFFFFF;
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: transform 0.3s ease;
}

.recap-item:hover {
    transform: translateX(4px);
}

.recap-num {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--promo-text-sub);
    opacity: 0.3;
    font-family: -apple-system, BlinkMacSystemFont, "SF Mono", monospace;
    min-width: 2.5rem;
}

.recap-item p {
    font-size: 1rem;
    color: var(--promo-text-main);
    line-height: 1.6;
    margin: 0;
    font-style: italic;
}

.final-answer {
    text-align: center;
    padding: 3rem 1.5rem 5rem;
}

.final-answer-text {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--promo-text-main);
    margin-bottom: 1.5rem;
    letter-spacing: -0.5px;
}

.final-answer-detail {
    font-size: 0.95rem;
    color: var(--promo-text-sub);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    padding: 0.8rem 2.5rem;
    background: #000;
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 30px;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.cta-button:hover {
    background: var(--promo-accent);
    color: #000;
    transform: translateY(-2px);
}

/* Tray CTA button */
.tray-cta {
    text-align: center;
    margin-top: 1.5rem;
}

.tray-cta .cta-button,
.tray-cta .tray-cta-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.5rem;
    font-size: 0.85rem;
    background: #000;
    color: #fff;
    border: 1px solid #000;
    cursor: pointer;
    user-select: none;
    text-decoration: none;
    animation: cta-glow 2.5s ease-in-out infinite;
}

@keyframes cta-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(0, 214, 143, 0);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 0 5px rgba(0, 214, 143, 0.15);
        transform: scale(1.02);
    }
}

.tray-cta .cta-text {
    letter-spacing: 0.5px;
    font-weight: 600;
}

.tray-cta .cta-button:hover,
.tray-cta .tray-cta-btn:hover {
    animation-play-state: paused;
    background: #fff;
    color: #000;
    border-color: #000;
    transform: scale(1.06) translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ============================================
   Knowledge Base Sync Animation (Evolution Module)
   ============================================ */

.kb-sync-container {
    margin-top: 2rem;
    border-radius: 16px;
    overflow: hidden;
    background: #0A0A0A;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    height: 200px;
}

@media (max-width: 480px) {
    .kb-sync-container {
        height: 150px;
    }
}

.kb-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: none;
}

.kb-core-stage {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 200px;
    margin: 0 auto 0.3rem;
    background: #0A0A0A;
}

.kb-evolution-text {
    text-align: center;
    font-size: 0.85rem;
    font-weight: 400;
    color: rgba(0, 0, 0, 0.4);
    margin: 0.8rem 0 0;
    padding: 0 1.5rem;
}

@media (max-width: 480px) {
    .kb-core-stage {
        height: 150px;
        background: #0A0A0A;
    }
}

.kb-core-orb {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    z-index: 1;
}

.orb-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 1px solid rgba(0, 214, 143, 0.2);
    animation: orbPulse 3s ease-in-out infinite;
}

.orb-ring-1 {
    width: 60px;
    height: 60px;
    animation-delay: 0s;
}

.orb-ring-2 {
    width: 75px;
    height: 75px;
    animation-delay: 0.5s;
    border-color: rgba(0, 214, 143, 0.1);
}

.orb-ring-3 {
    width: 90px;
    height: 90px;
    animation-delay: 1s;
    border-color: rgba(0, 214, 143, 0.05);
}

@keyframes orbPulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.15);
        opacity: 0.3;
    }
}

.kb-core-orb::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 214, 143, 0.12) 0%, transparent 70%);
    animation: orbGlow 2s ease-in-out infinite;
}

@keyframes orbGlow {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.3); }
}

.kb-logo {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background: url('../images/logo.webp') no-repeat center center;
    background-size: contain;
    border-radius: 10px;
    z-index: 0;
}

@keyframes orbSpin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Knowledge cards (removed but container kept for future) */
.kb-cards-stack {
    position: relative;
    z-index: 5;
    min-height: 0;
    margin-bottom: 0;
}

.kb-card {
    position: absolute;
    left: 50%;
    transform: translateX(-50%) scale(0.8);
    opacity: 0;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(0, 214, 143, 0.15);
    border-radius: 12px;
    padding: 0.6rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    white-space: nowrap;
    transition: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.kb-card.visible {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

.kb-card-1 { top: 0; }
.kb-card-2 { top: 42px; }
.kb-card-3 { top: 84px; }
.kb-card-4 { top: 126px; }
.kb-card-5 { top: 168px; }

.kb-card-check {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(0, 214, 143, 0.2);
    color: #00D68F;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}

.kb-card-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

/* KB Status */
.kb-status {
    position: relative;
    z-index: 5;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.6s cubic-bezier(0.25, 1, 0.5, 1);
    padding: 0 1.5rem 0.5rem;
}

.kb-status.visible {
    opacity: 1;
    transform: translateY(0);
}

.kb-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #00D68F;
    box-shadow: 0 0 8px rgba(0, 214, 143, 0.5);
    animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(0, 214, 143, 0.5); }
    50% { opacity: 0.5; box-shadow: 0 0 12px rgba(0, 214, 143, 0.8); }
}

.kb-status-text {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
}

@media (max-width: 480px) {
    .kb-sync-container {
        padding: 0.5rem 0 0.3rem;
        border-radius: 12px;
    }
    .kb-core-stage {
        height: 150px;
    }
    .kb-core-orb {
        width: 40px;
        height: 40px;
    }
    .orb-ring-1 { width: 50px; height: 50px; }
    .orb-ring-2 { width: 62px; height: 62px; }
    .orb-ring-3 { width: 75px; height: 75px; }
    .kb-logo { width: 34px; height: 34px; }
}

/* ============================================
   Device Sea Interactive (Stealth Module)
   ============================================ */

.device-sea-container {
    margin-top: 3rem;
    border-radius: 20px;
    overflow: hidden;
    background: #0A0A0A;
    position: relative;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
    min-height: 400px;
}

.device-sea-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    text-align: center;
    padding: 2rem 1.5rem 1rem;
    background: linear-gradient(to bottom, rgba(10, 10, 10, 0.95), transparent);
    pointer-events: none;
}

.device-count-prefix {
    display: block;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
    margin-bottom: 0.3rem;
}

.device-count {
    font-size: 2.4rem;
    font-weight: 800;
    color: #FFFFFF;
    font-family: -apple-system, BlinkMacSystemFont, "SF Mono", monospace;
    letter-spacing: -1px;
    line-height: 1;
}

.device-count-suffix {
    display: block;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
    margin-top: 0.3rem;
}

.device-sea-canvas {
    display: block;
    width: 100%;
    height: 400px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

.device-sea-cta {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(10, 10, 10, 0.95), transparent);
    pointer-events: none;
}

.device-sea-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(10, 10, 10, 0.9), transparent);
    pointer-events: none;
}

.device-sea-tagline {
    font-size: 0.8rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    margin: 0;
    letter-spacing: 0.5px;
}

.device-sea-container.clicked .sea-prompt {
    opacity: 0;
}

.device-sea-result {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 15;
    text-align: center;
    padding: 2rem 1.5rem;
    background: linear-gradient(to top, rgba(10, 10, 10, 0.98), transparent);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
    pointer-events: none;
}

.device-sea-container.show-result .device-sea-result {
    opacity: 1;
    transform: translateY(0);
}

.result-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: #FFFFFF;
    margin: 0 0 0.8rem;
    line-height: 1.4;
}

.result-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--promo-accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 0.3rem 1rem;
    border: 1px solid rgba(0, 214, 143, 0.3);
    border-radius: 20px;
}

@media (max-width: 480px) {
    .device-sea-container {
        min-height: 280px;
    }
    .device-sea-canvas {
        height: 280px;
    }
    .device-count {
        font-size: 1.6rem;
    }
    .device-sea-subtitle {
        font-size: 0.7rem;
    }
    .device-sea-tagline {
        font-size: 0.7rem;
    }
}

/* Premium strong text highlights */
.answer-detail strong {
    font-weight: 600;
    color: var(--promo-text-main);
}

/* Mobile-specific long-form typography optimization */
@media (max-width: 480px) {
    .answer-detail {
        font-size: 16px;
        line-height: 1.8;
        letter-spacing: 0.03em;
    }
    .answer-detail p {
        font-size: 16px;
        line-height: 1.8;
        margin-bottom: 22px;
        color: var(--promo-text-paragraph);
    }
    .answer-block .answer-text {
        font-size: 22px;
        line-height: 1.45;
        margin: 32px 0 20px;
    }
    .answer-detail .section-title {
        font-size: 18px;
        margin-top: 36px;
        padding-top: 16px;
        border-top: 1px dashed rgba(26, 59, 139, 0.06);
    }
    .answer-detail .section-title:first-of-type {
        border-top: none;
        padding-top: 0;
        margin-top: 16px;
    }
    .section-num {
        font-size: 20px;
        margin-right: 0.5rem;
    }
}

/* ==========================================================================
   Multi-language Switcher & Display Rules (Jobs Minimalist Style)
   ========================================================================== */

/* 1. Base display rules: Default is Chinese Simplified (zh) */
[lang="en"],
[lang="hk"] {
    display: none !important;
}

[lang="zh"] {
    display: inline !important;
}

p[lang="zh"], div[lang="zh"], section[lang="zh"], h1[lang="zh"], h3[lang="zh"], h4[lang="zh"], img[lang="zh"] {
    display: block !important;
}
span[lang="zh"] {
    display: inline !important;
}

/* 2. English Mode Active */
body.is-english [lang="zh"],
body.is-english [lang="hk"] {
    display: none !important;
}

body.is-english [lang="en"] {
    display: inline !important;
}

body.is-english p[lang="en"], 
body.is-english div[lang="en"], 
body.is-english section[lang="en"], 
body.is-english h1[lang="en"], 
body.is-english h3[lang="en"], 
body.is-english h4[lang="en"], 
body.is-english img[lang="en"] {
    display: block !important;
}
body.is-english span[lang="en"] {
    display: inline !important;
}

/* 3. Traditional Chinese (Hong Kong) Mode Active */
body.is-traditional [lang="zh"],
body.is-traditional [lang="en"] {
    display: none !important;
}

body.is-traditional [lang="hk"] {
    display: inline !important;
}

body.is-traditional p[lang="hk"], 
body.is-traditional div[lang="hk"], 
body.is-traditional section[lang="hk"], 
body.is-traditional h1[lang="hk"], 
body.is-traditional h3[lang="hk"], 
body.is-traditional h4[lang="hk"], 
body.is-traditional img[lang="hk"] {
    display: block !important;
}
body.is-traditional span[lang="hk"] {
    display: inline !important;
}

/* 4. Language Switcher Header Styles (Jobs Minimalist Style) */
.promo-header {
    justify-content: space-between !important;
    padding: 0 2.5rem !important;
}

.language-switch {
    position: relative;
    user-select: none;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--promo-text-main);
    z-index: 1100;
    transition: opacity 0.25s ease;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    border-radius: 20px;
    background: transparent;
    transition: color 0.25s cubic-bezier(0.16, 1, 0.3, 1), transform 0.2s ease;
}

.lang-current::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 3.5px solid transparent;
    border-right: 3.5px solid transparent;
    border-top: 4px solid var(--promo-text-main);
    opacity: 0.45;
    margin-left: 3px;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
}

.language-switch:hover .lang-current {
    color: var(--promo-text-sub);
}
.language-switch:hover .lang-current::after {
    opacity: 0.7;
}

.language-switch.active .lang-current::after {
    transform: rotate(180deg);
}

.lang-options {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(30px) saturate(190%);
    -webkit-backdrop-filter: blur(30px) saturate(190%);
    border: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: 16px;
    /* Ultra-soft and organic iOS-like shadow */
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.02), 
                0 18px 50px rgba(0, 0, 0, 0.05),
                inset 0 1px 0 rgba(255, 255, 255, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.96);
    transform-origin: top right;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                visibility 0.3s;
    overflow: hidden;
    padding: 6px;
    min-width: 105px;
}

.language-switch.active .lang-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.lang-option {
    padding: 8px 14px;
    border-radius: 10px;
    text-align: center;
    font-size: 13px;
    color: var(--promo-text-paragraph);
    transition: background 0.25s cubic-bezier(0.16, 1, 0.3, 1), 
                color 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.2s ease;
}

.lang-option:hover {
    background: rgba(0, 0, 0, 0.035);
    color: var(--promo-text-main);
}

.lang-option.active {
    background: #11110F;
    color: #FFFFFF;
    font-weight: 600;
}

@media (max-width: 768px) {
    .promo-header {
        padding: 0 1.2rem !important;
    }
}