/* ==========================================================================
   GIAI ĐIỆU ĐÔI MÌNH - LUXURY DARK ROMANCE STYLESHEET
   Palette based on Brand Logo:
   - Deep Black Studio Ambiance: #0A090D, #121017, #1A1722
   - Rose Gold Champagne Gradient: #F5D8B8 -> #E29B8C -> #C9757B
   - Text Primaries: #FFFFFF, #F8EDE3, #B8B0C0
   ========================================================================== */

:root {
    --bg-dark: #0A090D;
    --bg-card: rgba(22, 19, 29, 0.75);
    --bg-card-border: rgba(226, 155, 140, 0.25);
    --bg-card-hover: rgba(30, 25, 40, 0.85);

    --gold-champagne: #F5D8B8;
    --rose-gold: #E29B8C;
    --rose-ruby: #C9757B;

    --gradient-gold: linear-gradient(135deg, #F5D8B8 0%, #E29B8C 50%, #C9757B 100%);
    --gradient-gold-hover: linear-gradient(135deg, #FFF0DC 0%, #F0ABA0 50%, #DB868C 100%);

    --text-main: #FFFFFF;
    --text-muted: #B8B0C0;
    --text-subtle: #7F7788;

    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 9999px;

    --shadow-glow: 0 10px 30px rgba(226, 155, 140, 0.25);
    --shadow-card: 0 16px 40px rgba(0, 0, 0, 0.6);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

section[id] {
    scroll-margin-top: 80px;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    letter-spacing: -0.02em;
    color: var(--text-main);
    text-wrap: balance;
}

p, .section-desc, .hero-subtitle, .trust-item span {
    text-wrap: pretty;
}

.gradient-text {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* TOP ANNOUNCEMENT BAR */
.top-bar {
    background: linear-gradient(90deg, #18131d 0%, #2b1824 50%, #18131d 100%);
    border-bottom: 1px solid rgba(226, 155, 140, 0.2);
    text-align: center;
    padding: 8px 16px;
    font-size: 0.85rem;
    color: var(--gold-champagne);
}

/* SITE HEADER */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: rgba(10, 9, 13, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: 12px 0;
}

.header-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--rose-gold);
    box-shadow: 0 0 15px rgba(226, 155, 140, 0.3);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    color: var(--gold-champagne);
}

.brand-slogan {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* BUTTONS */


.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-pill);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    white-space: nowrap;
    line-height: 1;
}

.btn-sm {
    padding: 7px 14px;
    font-size: 0.8rem;
    gap: 6px;
    height: 32px;
}

.btn-primary {
    background: var(--gradient-gold);
    color: #1a0f12;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: var(--gradient-gold-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(226, 155, 140, 0.45);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--gold-champagne);
    border: 1px solid var(--bg-card-border);
}

.btn-secondary:hover {
    background: rgba(226, 155, 140, 0.15);
    border-color: var(--rose-gold);
}

.btn-header {
    background: var(--gradient-gold);
    color: #1a0f12;
    padding: 8px 18px;
    font-size: 0.85rem;
    font-weight: 700;
}

.btn-lg {
    padding: 15px 32px;
    font-size: 1.05rem;
}

.btn-zalo {
    background: #0068ff;
    color: #fff;
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-pill);
    text-decoration: none;
    display: inline-block;
}

.pulse-glow {
    animation: pulseGlow 2.5s infinite;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(226, 155, 140, 0.5); }
    70% { box-shadow: 0 0 0 15px rgba(226, 155, 140, 0); }
    100% { box-shadow: 0 0 0 0 rgba(226, 155, 140, 0); }
}

/* HERO SECTION */
.hero-section {
    position: relative;
    padding: 80px 0 60px;
    text-align: center;
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 350px;
    background: radial-gradient(circle, rgba(226, 155, 140, 0.18) 0%, rgba(10, 9, 13, 0) 70%);
    filter: blur(50px);
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    background: rgba(226, 155, 140, 0.1);
    border: 1px solid var(--bg-card-border);
    color: var(--gold-champagne);
    font-size: 0.85rem;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 2.8rem;
    line-height: 1.25;
    margin-bottom: 20px;
}

.hero-subtitle {
    max-width: 720px;
    margin: 0 auto 35px;
    color: var(--text-muted);
    font-size: 1.15rem;
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
    max-width: 860px;
    margin: 0 auto 40px;
}

.trust-item {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 14px;
    text-align: left;
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.trust-item:hover {
    transform: translateY(-2px);
    border-color: var(--rose-gold);
}

.trust-icon {
    font-size: 1.6rem;
}

.trust-item strong {
    display: block;
    color: var(--gold-champagne);
    font-size: 0.95rem;
}

.trust-item span {
    font-size: 0.8rem;
    color: var(--text-subtle);
}

.hero-cta-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* SECTION COMMONS */
.sub-label {
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    color: var(--rose-gold);
    font-weight: 700;
    display: block;
    margin-bottom: 8px;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.section-desc {
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto 35px;
    font-size: 1.05rem;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

.glass-panel {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

/* DEMO PLAYER */
.demo-section {
    padding: 60px 0;
}

.player-card {
    max-width: 860px;
    margin: 0 auto;
    overflow: hidden;
    padding: 24px;
}

.player-genre-tabs {
    display: flex;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 18px;
    margin-bottom: 24px;
    overflow-x: auto;
}

.genre-tab {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 8px 18px;
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s ease;
}

.genre-tab:hover {
    border-color: var(--rose-gold);
    color: #fff;
}

.genre-tab.active {
    background: rgba(226, 155, 140, 0.15);
    border-color: var(--rose-gold);
    color: var(--gold-champagne);
    font-weight: 600;
}

.player-body {
    display: flex;
    align-items: center;
    gap: 32px;
}

.player-disc-wrap {
    position: relative;
    flex-shrink: 0;
}

.player-disc {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    position: relative;
    overflow: hidden;
    border: 3px solid rgba(226, 155, 140, 0.4);
    box-shadow: 0 0 25px rgba(226, 155, 140, 0.3);
    transition: transform 0.5s ease;
}

.player-disc.playing {
    animation: spinDisc 6s linear infinite;
}

@keyframes spinDisc {
    100% { transform: rotate(360deg); }
}

.disc-art {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.disc-hole {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 28px;
    height: 28px;
    background: var(--bg-dark);
    border: 3px solid var(--rose-gold);
    border-radius: 50%;
}

.waveform-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    height: 30px;
    margin-top: 12px;
}

.waveform-wrap .bar {
    width: 3px;
    height: 8px;
    background: var(--rose-gold);
    border-radius: 3px;
    transition: height 0.2s ease;
}

.waveform-wrap.playing .bar {
    animation: wavePulse 1s ease-in-out infinite alternate;
}

.waveform-wrap.playing .bar:nth-child(2) { animation-delay: 0.1s; }
.waveform-wrap.playing .bar:nth-child(3) { animation-delay: 0.2s; }
.waveform-wrap.playing .bar:nth-child(4) { animation-delay: 0.3s; }
.waveform-wrap.playing .bar:nth-child(5) { animation-delay: 0.4s; }
.waveform-wrap.playing .bar:nth-child(6) { animation-delay: 0.5s; }
.waveform-wrap.playing .bar:nth-child(7) { animation-delay: 0.6s; }

@keyframes wavePulse {
    0% { height: 6px; }
    100% { height: 28px; background: var(--gold-champagne); }
}

.player-info {
    flex-grow: 1;
}

.track-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}

.track-title {
    font-size: 1.4rem;
    color: var(--gold-champagne);
    margin-bottom: 4px;
}

.track-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.badge-studio {
    background: rgba(226, 155, 140, 0.15);
    border: 1px solid var(--rose-gold);
    color: var(--gold-champagne);
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.lyrics-preview-box {
    background: rgba(0, 0, 0, 0.3);
    border-left: 3px solid var(--rose-gold);
    padding: 12px 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 20px;
}

.lyric-lead {
    font-size: 0.75rem;
    color: var(--rose-gold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.lyric-line {
    font-style: italic;
    font-size: 0.95rem;
    color: #fff;
    line-height: 1.5;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-play {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--gradient-gold);
    color: #1a0f12;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
    box-shadow: 0 4px 18px rgba(226, 155, 140, 0.35);
    transition: transform 0.2s ease;
}

.btn-play:hover {
    transform: scale(1.06);
}

.progress-wrap {
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    color: var(--text-subtle);
}

.progress-bar-bg {
    flex-grow: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
}

.progress-bar-fill {
    width: 0%;
    height: 100%;
    background: var(--gradient-gold);
    border-radius: 3px;
    transition: width 0.1s linear;
}

/* SHOWCASE SECTION */
.showcase-section {
    padding: 70px 0;
    background: linear-gradient(180deg, rgba(10, 9, 13, 0) 0%, rgba(20, 16, 26, 0.5) 100%);
}

.showcase-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
}

.feature-checklist {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.check-item {
    display: flex;
    gap: 14px;
}

.check-icon {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(226, 155, 140, 0.2);
    color: var(--gold-champagne);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

.check-item strong {
    color: var(--gold-champagne);
    font-size: 1.05rem;
    display: block;
    margin-bottom: 4px;
}

.check-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.price-callout {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.price-val {
    display: flex;
    flex-direction: column;
}

.old-price {
    font-size: 0.9rem;
    text-decoration: line-through;
    color: var(--text-subtle);
}

.current-price {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
}

.price-note strong {
    display: block;
    color: #fff;
    font-size: 0.95rem;
}

.price-note span {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-wrap: balance;
    display: inline-block;
}

/* PHONE MOCKUP */
.phone-mockup {
    width: 290px;
    margin: 0 auto;
    border-radius: 36px;
    border: 3px solid rgba(226, 155, 140, 0.35);
    padding: 14px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px rgba(226, 155, 140, 0.2);
}

.phone-header {
    display: flex;
    justify-content: center;
    margin-bottom: 12px;
}

.phone-notch {
    width: 60px;
    height: 5px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.phone-screen {
    background: #14111a;
    border-radius: 24px;
    padding: 20px 14px;
    text-align: center;
}

.phone-cover {
    width: 130px;
    height: 130px;
    margin: 0 auto 14px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--rose-gold);
}

.phone-art {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.phone-song-title {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    color: var(--gold-champagne);
    font-weight: 700;
    text-wrap: balance;
}

.phone-song-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 14px;
    text-wrap: balance;
}

.phone-lyrics-box {
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-sm);
    padding: 10px;
    margin-bottom: 14px;
}

.phone-lyric-active {
    font-size: 0.8rem;
    color: var(--gold-champagne);
    font-weight: 600;
    margin-bottom: 4px;
    text-wrap: balance;
}

.phone-lyric-next {
    font-size: 0.72rem;
    color: var(--text-subtle);
    text-wrap: balance;
}

.phone-qr-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: rgba(226, 155, 140, 0.15);
    border: 1px solid var(--bg-card-border);
    font-size: 0.75rem;
    color: var(--gold-champagne);
}

/* ORDER FORM SECTION */
.order-section {
    padding: 70px 0;
}

.order-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 36px 30px;
}

/* STEPPER */
.stepper-wrap {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 35px;
    position: relative;
}

.step-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 2;
    background: transparent;
}

.step-num {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #14111a;
    border: 2px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.step-label {
    font-size: 0.82rem;
    color: var(--text-subtle);
    text-align: center;
    white-space: nowrap;
}

.step-node.active .step-num {
    background: var(--gradient-gold);
    color: #1a0f12;
    border-color: transparent;
    box-shadow: 0 0 16px rgba(226, 155, 140, 0.45);
}

.step-node.active .step-label {
    color: var(--gold-champagne);
    font-weight: 600;
}

.step-line {
    flex-grow: 1;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    margin-top: 19px; /* Canh đúng tâm của hình tròn 38px / 2 */
    margin-left: 12px;
    margin-right: 12px;
    transition: background 0.3s ease;
    z-index: 1;
}

.step-line.active {
    background: var(--rose-gold);
    box-shadow: 0 0 8px rgba(226, 155, 140, 0.3);
}

/* FORM ELEMENTS */
.form-step {
    display: none;
}

.form-step.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.step-title {
    font-size: 1.4rem;
    color: var(--gold-champagne);
    margin-bottom: 6px;
}

.step-sub {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 22px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 18px;
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gold-champagne);
    margin-bottom: 8px;
}

.req {
    color: #ff5e7e;
}

.form-control {
    width: 100%;
    padding: 13px 16px;
    background: rgba(10, 9, 13, 0.6);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--rose-gold);
    box-shadow: 0 0 12px rgba(226, 155, 140, 0.25);
    background: rgba(18, 14, 22, 0.85);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
    line-height: 1.5;
}

.option-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pill-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap !important;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.pill-btn:hover {
    border-color: var(--rose-gold);
    color: #fff;
}

.pill-btn.active {
    background: rgba(226, 155, 140, 0.18);
    border-color: var(--rose-gold);
    color: var(--gold-champagne);
    font-weight: 600;
}

/* AI PROMPT BOX */
.ai-prompt-box {
    background: rgba(226, 155, 140, 0.08);
    border: 1px dashed var(--rose-gold);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    margin-bottom: 20px;
}

.ai-box-title {
    display: block;
    font-size: 0.85rem;
    color: var(--gold-champagne);
    font-weight: 600;
    margin-bottom: 10px;
}

.ai-templates {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn-ai-template {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(226, 155, 140, 0.25);
    color: var(--text-muted);
    padding: 7px 14px;
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-ai-template:hover {
    background: rgba(226, 155, 140, 0.18);
    color: #fff;
    border-color: var(--rose-gold);
    transform: translateY(-1px);
}

/* STEP 3: VIETQR PAYMENT */
.payment-alert {
    background: rgba(226, 155, 140, 0.12);
    border: 1px solid var(--rose-gold);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.alert-icon {
    font-size: 1.8rem;
}

.payment-alert strong {
    display: block;
    color: var(--gold-champagne);
    font-size: 0.95rem;
}

.payment-alert p {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0;
}

.qr-payment-card {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 28px;
    padding: 24px;
    align-items: center;
}

.qr-img-wrap {
    text-align: center;
    background: #fff;
    padding: 12px;
    border-radius: var(--radius-md);
    box-shadow: 0 0 20px rgba(226, 155, 140, 0.25);
}

.vietqr-code {
    width: 100%;
    height: auto;
    display: block;
}

.qr-scan-hint {
    color: #1a0f12;
    font-size: 0.75rem;
    font-weight: 700;
    margin-top: 6px;
}

.qr-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.detail-row {
    display: flex;
    align-items: center;
    font-size: 0.95rem;
}

.detail-lbl {
    width: 140px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.detail-val {
    color: #fff;
    font-weight: 600;
}

.detail-val.highlight {
    color: var(--gold-champagne);
    font-family: monospace;
    font-size: 1.15rem;
    letter-spacing: 0.05em;
}

.price-val-qr {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--gold-champagne);
    font-weight: 700;
}

.copy-box {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-copy {
    background: rgba(226, 155, 140, 0.15);
    border: 1px solid var(--rose-gold);
    color: var(--gold-champagne);
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-copy:hover {
    background: var(--gradient-gold);
    color: #1a0f12;
}

.qr-help-text {
    font-size: 0.8rem;
    color: var(--text-subtle);
    margin-top: 8px;
}

/* SUCCESS REASSURANCE */
.success-card {
    padding: 40px 30px;
}

.success-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
}

.success-title {
    font-size: 1.8rem;
    color: var(--gold-champagne);
    margin-bottom: 12px;
}

.success-desc {
    color: var(--text-muted);
    max-width: 580px;
    margin: 0 auto 24px;
    font-size: 1.05rem;
}

.eta-box {
    background: rgba(226, 155, 140, 0.1);
    border: 1px solid var(--bg-card-border);
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.eta-box span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-subtle);
}

.eta-box strong {
    font-size: 1.15rem;
    color: var(--gold-champagne);
}

.zalo-guide {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 14px;
}

/* FAQ SECTION */
.faq-section {
    padding: 60px 0 80px;
}

.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.faq-card {
    padding: 24px;
}

.faq-q {
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--gold-champagne);
    margin-bottom: 10px;
    font-weight: 600;
}

.faq-a {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* FOOTER */
.site-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 40px 0;
    background: #070609;
}

.footer-logo {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-bottom: 12px;
    border: 1px solid var(--rose-gold);
}

.footer-brand {
    font-size: 1.2rem;
    color: var(--gold-champagne);
    margin-bottom: 4px;
}

.footer-slogan {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 18px;
}

/* DEMO SECTION SOCIAL PROOF */
.demo-social-proof {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-top: 6px;
}
.demo-social-proof a {
    color: var(--gold-champagne);
    text-decoration: underline;
    font-weight: 600;
    transition: color 0.2s ease;
}
.demo-social-proof a:hover {
    color: #fff;
}

/* FOOTER SOCIAL CHANNELS */
.footer-social-wrap {
    margin: 18px auto 22px;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(226, 155, 140, 0.15);
    border-radius: var(--radius-lg);
    display: inline-block;
    max-width: 100%;
}
.footer-social-heading {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gold-champagne);
    font-weight: 600;
    margin-bottom: 12px;
}
.footer-social-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}
.social-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.social-pill svg {
    flex-shrink: 0;
    transition: transform 0.2s ease;
}
.social-pill:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}
.social-pill:hover svg {
    transform: scale(1.15);
}
.social-pill.fb:hover {
    background: rgba(24, 119, 242, 0.15);
    border-color: #1877f2;
    color: #5ea2ff;
}
.social-pill.tt:hover {
    background: rgba(254, 44, 85, 0.15);
    border-color: #fe2c55;
    color: #ff6b8b;
}
.social-pill.yt:hover {
    background: rgba(255, 0, 0, 0.15);
    border-color: #ff0000;
    color: #ff5e5e;
}
.social-pill.zl:hover {
    background: rgba(0, 104, 255, 0.15);
    border-color: #0068ff;
    color: #4da2ff;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 14px;
    font-size: 0.85rem;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--gold-champagne);
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--text-subtle);
}

/* MODAL */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-card {
    max-width: 480px;
    width: 90%;
    padding: 28px;
}

/* ==========================================================================
   DEDICATED MOBILE USER EXPERIENCE (<= 768px & <= 480px)
   Designed specifically for iPhone and Android devices
   ========================================================================== */

/* STICKY BOTTOM BAR (HIDDEN ON DESKTOP, VISIBLE ON MOBILE) */
.mobile-sticky-bar {
    display: none;
}

@media (max-width: 900px) {
    .showcase-grid {
        grid-template-columns: 1fr;
    }
    .trust-grid {
        grid-template-columns: 1fr;
    }
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    /* MOBILE BASE SETTINGS */
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 0 16px;
    }

    /* TOP BAR & HEADER COMPACT */
    .top-bar {
        font-size: 0.76rem;
        padding: 6px 10px;
    }

    .site-header {
        padding: 10px 0;
    }

    .logo-img {
        width: 38px;
        height: 38px;
    }

    .brand-name {
        font-size: 0.95rem;
    }

    .brand-slogan {
        display: none; /* Ẩn slogan để header điện thoại không bị tràn */
    }

    .btn-header {
        padding: 6px 14px;
        font-size: 0.8rem;
    }

    /* HERO SECTION FOR MOBILE */
    .hero-section {
        padding: 40px 0 35px;
    }

    .hero-badge {
        font-size: 0.75rem;
        padding: 5px 12px;
        margin-bottom: 16px;
    }

    .hero-title {
        font-size: 1.85rem;
        line-height: 1.3;
        margin-bottom: 14px;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.55;
        margin-bottom: 24px;
    }

    .trust-grid {
        grid-template-columns: 1fr;
        gap: 10px;
        margin-bottom: 28px;
    }

    .trust-item {
        padding: 12px 14px;
        gap: 12px;
    }

    .trust-icon {
        font-size: 1.3rem;
    }

    .trust-item strong {
        font-size: 0.9rem;
    }

    .trust-item span {
        font-size: 0.75rem;
    }

    .hero-cta-group {
        flex-direction: column;
        gap: 12px;
    }

    .hero-cta-group .btn {
        width: 100%;
        padding: 14px 20px;
        font-size: 0.95rem;
    }

    /* DEMO AUDIO PLAYER FOR MOBILE */
    .demo-section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 1.65rem;
        line-height: 1.3;
    }

    .section-desc {
        font-size: 0.9rem;
        margin-bottom: 24px;
    }

    .player-card {
        padding: 18px 14px;
        border-radius: var(--radius-md);
    }

    .player-genre-tabs {
        display: flex;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        gap: 8px;
        padding-bottom: 12px;
        margin-bottom: 18px;
    }

    .player-genre-tabs::-webkit-scrollbar {
        display: none;
    }

    .genre-tab {
        padding: 6px 14px;
        font-size: 0.8rem;
        flex-shrink: 0;
    }

    .player-body {
        flex-direction: column;
        text-align: center;
        gap: 18px;
    }

    .player-disc {
        width: 110px;
        height: 110px;
    }

    .waveform-wrap {
        height: 24px;
        margin-top: 8px;
    }

    .track-header {
        flex-direction: column;
        align-items: center;
        gap: 8px;
        margin-bottom: 12px;
    }

    .track-title {
        font-size: 1.2rem;
    }

    .track-meta {
        font-size: 0.78rem;
    }

    .badge-studio {
        font-size: 0.7rem;
        padding: 3px 8px;
    }

    .lyrics-preview-box {
        padding: 10px 12px;
        margin-bottom: 16px;
    }

    .lyric-line {
        font-size: 0.88rem;
    }

    .player-controls {
        flex-direction: row;
        align-items: center;
        gap: 12px;
    }

    .btn-play {
        width: 48px;
        height: 48px;
        font-size: 1.15rem;
    }

    /* SHOWCASE FOR MOBILE */
    .showcase-section {
        padding: 45px 0;
    }

    .showcase-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .feature-checklist {
        gap: 16px;
        margin-bottom: 24px;
    }

    .check-item {
        gap: 10px;
    }

    .check-item strong {
        font-size: 0.95rem;
    }

    .check-item p {
        font-size: 0.85rem;
    }

    .price-callout {
        padding: 16px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .current-price {
        font-size: 1.7rem;
    }

    .phone-mockup {
        width: 100%;
        max-width: 270px;
        padding: 10px;
    }

    /* ORDER FORM FOR MOBILE */
    .order-section {
        padding: 45px 0;
    }

    .order-container {
        padding: 24px 16px;
        border-radius: var(--radius-md);
    }

    .stepper-wrap {
        margin-bottom: 26px;
    }

    .step-num {
        width: 32px;
        height: 32px;
        font-size: 0.82rem;
    }

    .step-label {
        font-size: 0.72rem;
    }

    .step-line {
        margin-top: 16px;
        margin-left: 6px;
        margin-right: 6px;
    }

    .step-title {
        font-size: 1.2rem;
    }

    .step-sub {
        font-size: 0.82rem;
        margin-bottom: 16px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 14px;
        margin-bottom: 14px;
    }

    .form-group {
        margin-bottom: 16px;
    }

    .form-group label {
        font-size: 0.85rem;
        margin-bottom: 6px;
    }

    /* Cỡ chữ 16px chống iOS Safari tự động phóng to màn hình */
    .form-control {
        font-size: 16px;
        padding: 12px 14px;
    }

    textarea.form-control {
        min-height: 100px;
    }

    .option-pills {
        gap: 6px;
    }

    .pill-btn {
        padding: 7px 12px;
        font-size: 0.78rem;
    }

    .ai-prompt-box {
        padding: 12px;
    }

    .ai-box-title {
        font-size: 0.78rem;
    }

    .btn-ai-template {
        padding: 8px 10px;
        font-size: 0.78rem;
        line-height: 1.4;
    }

    .step-actions {
        flex-direction: column-reverse;
        gap: 10px;
    }

    .step-actions .btn {
        width: 100%;
        padding: 14px;
        font-size: 0.95rem;
    }

    /* VIETQR PAYMENT ON MOBILE */
    .payment-alert {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding: 12px 14px;
    }

    .qr-payment-card {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 18px 14px;
    }

    .qr-img-wrap {
        max-width: 210px;
        margin: 0 auto;
        padding: 8px;
    }

    .detail-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        padding-bottom: 8px;
    }

    .detail-lbl {
        width: 100%;
        font-size: 0.78rem;
    }

    .detail-val {
        font-size: 0.95rem;
    }

    .copy-box {
        width: 100%;
        justify-content: space-between;
    }

    .btn-copy {
        padding: 6px 14px;
        font-size: 0.8rem;
    }

    .mobile-qr-download-wrap {
        margin-top: 14px;
    }

    .btn-download-qr {
        width: 100%;
        padding: 12px;
        font-size: 0.88rem;
        border-color: var(--rose-gold);
        background: rgba(226, 155, 140, 0.12);
    }

    .payment-actions .btn {
        width: 100%;
        padding: 15px;
        font-size: 1rem;
    }

    /* FAQ ON MOBILE */
    .faq-section {
        padding: 40px 0 90px;
    }

    .faq-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .faq-card {
        padding: 18px 16px;
    }

    .faq-q {
        font-size: 0.95rem;
    }

    .faq-a {
        font-size: 0.85rem;
    }

    /* FOOTER ON MOBILE */
    .site-footer {
        padding: 30px 0 100px;
    }

    /* STICKY BOTTOM BAR FOR MOBILE */
    .mobile-sticky-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(12, 10, 16, 0.94);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-top: 1px solid rgba(226, 155, 140, 0.3);
        padding: 10px 16px;
        padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
        z-index: 990;
        box-shadow: 0 -5px 25px rgba(0, 0, 0, 0.7);
    }

    .mobile-bar-info {
        display: flex;
        flex-direction: column;
    }

    .mobile-bar-price {
        font-family: var(--font-heading);
        font-size: 1.15rem;
        font-weight: 700;
        color: var(--gold-champagne);
    }

    .mobile-bar-note {
        font-size: 0.72rem;
        color: var(--text-muted);
    }

    .btn-mobile-cta {
        padding: 10px 20px;
        font-size: 0.88rem;
        font-weight: 700;
    }
}

/* ==========================================================================
   LUXURY REDESIGNED NAVBAR FOR BLOG HUB & BLOG ARTICLES
   ========================================================================== */
.blog-site-header,
.site-header:has(.main-nav) {
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    background: rgba(12, 10, 16, 0.94);
    border-bottom: 1px solid rgba(226, 155, 140, 0.2);
    padding: 14px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
}

.blog-site-header .header-container,
.site-header:has(.main-nav) .header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.blog-site-header .brand-logo,
.site-header:has(.main-nav) .brand-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none !important;
    flex-shrink: 0;
}

.blog-site-header .logo-img,
.site-header:has(.main-nav) .logo-img {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    object-fit: cover;
    border: 1.5px solid var(--rose-gold);
    box-shadow: 0 0 20px rgba(226, 155, 140, 0.35);
    transition: all 0.3s ease;
}

.blog-site-header .brand-logo:hover .logo-img,
.site-header:has(.main-nav) .brand-logo:hover .logo-img {
    transform: scale(1.08) rotate(4deg);
    box-shadow: 0 0 25px rgba(226, 155, 140, 0.55);
}

.brand-info {
    display: flex;
    flex-direction: column;
}

.brand-info .brand-name {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 0.05em;
    color: var(--gold-champagne);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
    line-height: 1.2;
    white-space: nowrap;
}

.brand-tagline {
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    margin-top: 2px;
}

/* LUXURY FLOATING NAV PILL */
.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(22, 17, 28, 0.85);
    padding: 6px 10px;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(226, 155, 140, 0.25);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.08), 0 8px 24px rgba(0, 0, 0, 0.4);
}

.nav-link {
    color: #d8d0db !important;
    text-decoration: none !important;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: var(--radius-pill);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.nav-link:hover {
    color: #fff !important;
    background: rgba(226, 155, 140, 0.16);
    text-decoration: none !important;
    transform: translateY(-1px);
}

.nav-link.active {
    color: #1a0f12 !important;
    background: var(--gradient-gold) !important;
    font-weight: 700 !important;
    box-shadow: 0 3px 14px rgba(226, 155, 140, 0.5);
    text-decoration: none !important;
}

/* HEADER ACTIONS BUTTON */
.header-actions {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.header-actions .btn {
    background: var(--gradient-gold);
    color: #1a0f12 !important;
    text-decoration: none !important;
    padding: 10px 22px;
    font-size: 0.88rem;
    font-weight: 700;
    border-radius: var(--radius-pill);
    box-shadow: 0 4px 18px rgba(226, 155, 140, 0.4);
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
}

.header-actions .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(226, 155, 140, 0.6);
}

@media (max-width: 920px) {
    .blog-site-header .header-container,
    .site-header:has(.main-nav) .header-container {
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 12px;
        padding: 0 16px;
    }
    .blog-site-header .main-nav,
    .site-header:has(.main-nav) .main-nav {
        order: 3;
        width: 100%;
        justify-content: space-around;
        padding: 5px 8px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .blog-site-header .nav-link,
    .site-header:has(.main-nav) .nav-link {
        padding: 6px 12px;
        font-size: 0.82rem;
        gap: 4px;
    }
    .blog-site-header .brand-name,
    .site-header:has(.main-nav) .brand-name {
        font-size: 1.05rem;
    }
    .blog-site-header .logo-img,
    .site-header:has(.main-nav) .logo-img {
        width: 38px;
        height: 38px;
    }
    .blog-site-header .header-actions .btn,
    .site-header:has(.main-nav) .header-actions .btn {
        padding: 8px 16px;
        font-size: 0.82rem;
    }
}