/* VARIABLES & RESET */
:root {
    --primary-red: #A31D1D;
    --dark-red: #7A1616;
    --gold: #D4AF37;
    --light-gold: #F4E0A0;
    --dark-bg: #111111;
    --text-main: #333333;
    --text-light: #F8F8F8;
    --white: #FFFFFF;
    --gray-bg: #F9F9F9;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-red);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-spacing {
    padding: 80px 0;
}

/* TYPOGRAPHY */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    font-weight: 700;
}

/* SPLIT LAYOUT (IMAGE + TEXT) */
.split-layout {
    display: flex;
    align-items: center;
    gap: 50px;
}
.split-layout.reverse {
    flex-direction: row-reverse;
}
.split-image {
    flex: 1;
}
.split-content {
    flex: 1.2;
}
.content-img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
    object-fit: cover;
}
.gold-border {
    border: 4px solid var(--gold);
}

/* BUTTONS */
.cta-button {
    display: inline-block;
    padding: 18px 40px;
    font-size: 1.1rem;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.primary-cta {
    background: linear-gradient(135deg, var(--gold) 0%, #B8962D 100%);
    color: var(--dark-bg);
}

.primary-cta:hover {
    background: linear-gradient(135deg, #FFE066 0%, var(--gold) 100%);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4);
}

.secondary-cta {
    background-color: var(--primary-red);
    color: var(--white);
}

.secondary-cta:hover {
    background-color: var(--dark-red);
    transform: translateY(-3px);
}

.pulse-animation {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* HERO SECTION */
.hero-section {
    background: linear-gradient(rgba(17, 17, 17, 0.8), rgba(17, 17, 17, 0.9)), url('https://images.unsplash.com/photo-1601058268499-e52658b8ebf8?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover;
    color: var(--white);
    padding: 100px 20px;
    position: relative;
}

.hero-flex {
    display: flex;
    align-items: center;
    gap: 50px;
}
.hero-content {
    flex: 1.2;
}
.hero-image {
    flex: 0.8;
}

.hero-img-style {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    border: 4px solid var(--gold);
}

.floating-img {
    animation: float 4s ease-in-out infinite;
}
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

.hero-section .headline {
    color: var(--gold);
    font-size: 2.8rem;
    line-height: 1.3;
    margin: 20px 0;
}

.hero-section .sub-headline {
    font-size: 1.1rem;
    margin-bottom: 30px;
    font-weight: 300;
}

.cta-note {
    font-size: 0.85rem;
    color: #ccc;
    margin-top: 15px;
    font-style: italic;
}

/* TRUST SIGNAL BAR */
.trust-signal {
    background-color: var(--gold);
    padding: 20px 0;
    color: var(--dark-bg);
}

.flex-row {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1rem;
}

.trust-item i {
    font-size: 1.5rem;
}

/* PROBLEM SECTION */
.problem-section {
    background-color: var(--white);
}

.problem-grid-stack {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.problem-card {
    background: var(--gray-bg);
    padding: 30px;
    border-radius: 12px;
    position: relative;
    border-left: 4px solid var(--primary-red);
    transition: transform 0.3s ease;
}

.problem-card:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.problem-number {
    position: absolute;
    top: -15px;
    left: 20px;
    background: var(--primary-red);
    color: var(--white);
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: bold;
    font-size: 1.1rem;
}

.problem-card h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
    margin-top: 10px;
}

.quote {
    font-style: italic;
    color: #666;
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.core-issue {
    background: #FFF9E6;
    padding: 12px;
    border-radius: 8px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-size: 0.95rem;
}

.core-issue i {
    color: #E6A23C;
    margin-top: 4px;
}

/* SOLUTION SECTION */
.solution-section {
    background-color: var(--dark-bg);
    color: var(--white);
}

.step-container-stack {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-card {
    background: rgba(255,255,255,0.05);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(212, 175, 55, 0.2);
}

.center-btn {
    text-align: center;
}

/* BENEFITS SECTION */
.benefit-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.benefit-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.benefit-check {
    color: var(--primary-red);
    font-size: 1.2rem;
    background: rgba(163, 29, 29, 0.1);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.benefit-content h4 {
    font-size: 1.2rem;
    margin-bottom: 5px;
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
}
.benefit-content p {
    font-size: 0.95rem;
    color: #555;
}

/* FINAL CTA SECTION */
.final-cta-section {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: var(--white);
}

.cta-desc {
    font-size: 1.1rem;
    margin-bottom: 25px;
}

.cta-list {
    list-style: none;
    text-align: left;
    margin-bottom: 30px;
}

.cta-list li {
    font-size: 1.05rem;
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
}

.cta-list i {
    color: var(--gold);
    margin-right: 12px;
    margin-top: 5px;
    font-size: 1.2rem;
}

.form-container {
    background: var(--white);
    padding: 35px;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input, textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-red);
}

.form-btn {
    width: 100%;
    margin-top: 10px;
}

.scarcity-text {
    color: var(--primary-red);
    font-size: 0.9rem;
    margin-top: 15px;
}

/* FOOTER */
footer {
    background: var(--dark-bg);
    color: #888;
    text-align: center;
    padding: 30px 20px;
    font-size: 0.9rem;
}

/* POPUP MODAL */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 12px;
    width: 95%;
    max-width: 500px;
    position: relative;
    transform: translateY(-20px);
    transition: all 0.3s ease;
}
.modal-overlay.active .modal-content {
    transform: translateY(0);
}
.modal-close {
    position: absolute;
    top: 10px; right: 15px;
    font-size: 1.5rem;
    cursor: pointer;
    color: #888;
    transition: color 0.3s;
}
.modal-close:hover {
    color: var(--primary-red);
}

/* STICKY FOOTER CTA */
.sticky-cta {
    position: fixed;
    bottom: 0; left: 0; width: 100%;
    background: var(--white);
    padding: 12px 15px;
    box-shadow: 0 -5px 15px rgba(0,0,0,0.15);
    z-index: 999;
    text-align: center;
    display: none;
}
.sticky-cta .cta-button {
    padding: 14px 20px;
    width: 100%;
    font-size: 1.05rem;
}

/* RESPONSIVE */
@media (max-width: 992px) {
    .split-layout, .split-layout.reverse, .hero-flex {
        flex-direction: column;
    }
    .hero-content {
        text-align: center;
    }
    .hero-section .headline {
        font-size: 2.2rem;
    }
    .final-cta-section .split-content {
        text-align: center !important;
    }
    .final-cta-section .split-content h2, 
    .final-cta-section .split-content p {
        text-align: center !important;
    }
    .cta-list {
        display: inline-block;
        text-align: left;
    }
}

@media (max-width: 768px) {
    .sticky-cta {
        display: block;
    }
    body {
        padding-bottom: 70px; /* Ngăn content bị che bởi sticky footer */
    }
    .section-title {
        font-size: 1.8rem;
    }
}