/* ============================================
   7PSI - MODERN INDUSTRIAL DESIGN SYSTEM
   ============================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
    /* Colors */
    --primary: #C62828;
    --primary-light: #EF5350;
    --primary-dark: #8E0000;
    --accent: #E94560;
    --dark: #1A1A2E;
    --dark-2: #16213E;
    --dark-3: #0F3460;
    --surface: #1E2A4A;
    --steel: #A0A0B0;
    --steel-light: #C0C0D0;
    --light: #F5F5F5;
    --white: #FFFFFF;
    --glass: rgba(30, 42, 74, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #C62828 0%, #E94560 100%);
    --gradient-dark: linear-gradient(180deg, #1A1A2E 0%, #16213E 100%);
    --gradient-hero: linear-gradient(135deg, #1A1A2E 0%, #0F3460 50%, #1A1A2E 100%);
    --gradient-card: linear-gradient(145deg, rgba(30, 42, 74, 0.8) 0%, rgba(22, 33, 62, 0.4) 100%);

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --section-padding: 120px 0;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

    /* Shadows */
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 16px 48px rgba(233, 69, 96, 0.15);
    --shadow-glow: 0 0 40px rgba(198, 40, 40, 0.3);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--dark);
    color: var(--steel-light);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Particle Canvas --- */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

/* --- Utility Classes --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 6px 20px;
    border: 1px solid rgba(233, 69, 96, 0.3);
    border-radius: 50px;
    background: rgba(233, 69, 96, 0.08);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--steel);
    max-width: 560px;
    margin: 0 auto;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 20px rgba(198, 40, 40, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(198, 40, 40, 0.6);
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::after {
    left: 100%;
}

.btn-outline {
    background: transparent;
    color: var(--steel-light);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--white);
    background: rgba(233, 69, 96, 0.08);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 12px 0;
    background: rgba(26, 26, 46, 0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    text-decoration: none;
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 900;
    display: flex;
    align-items: baseline;
}

.logo-7 {
    color: var(--primary);
    font-size: 2.2rem;
}

.logo-psi {
    color: var(--primary-dark);
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    text-decoration: none;
    color: var(--steel);
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all var(--transition-normal);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--steel-light);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
    padding: 0 24px;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--accent);
    margin-bottom: 24px;
    padding: 8px 24px;
    border: 1px solid rgba(233, 69, 96, 0.3);
    border-radius: 50px;
    background: rgba(233, 69, 96, 0.08);
    animation: pulse-glow 3s infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(233, 69, 96, 0.2); }
    50% { box-shadow: 0 0 20px 5px rgba(233, 69, 96, 0.1); }
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(5rem, 15vw, 12rem);
    font-weight: 900;
    line-height: 0.9;
    margin-bottom: 8px;
    letter-spacing: -2px;
}

.hero-7 {
    color: var(--primary);
    text-shadow: 0 0 60px rgba(198, 40, 40, 0.5);
    position: relative;
}

.hero-psi {
    color: var(--primary-dark);
}

.hero-tagline {
    font-family: var(--font-heading);
    font-size: clamp(1.2rem, 3vw, 2rem);
    font-weight: 300;
    letter-spacing: 12px;
    color: var(--steel);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--steel);
    max-width: 520px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

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

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--steel);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-family: var(--font-heading);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scroll-pulse 2s infinite;
}

@keyframes scroll-pulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.about-card {
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px 32px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-slow);
}

.about-card:hover {
    transform: translateY(-8px);
    border-color: rgba(233, 69, 96, 0.2);
    box-shadow: var(--shadow-hover);
}

.about-card:hover::before {
    transform: scaleX(1);
}

.about-icon {
    width: 72px;
    height: 72px;
    border-radius: 16px;
    background: rgba(233, 69, 96, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--accent);
    transition: all var(--transition-normal);
}

.about-card:hover .about-icon {
    background: var(--gradient-primary);
    color: var(--white);
    transform: scale(1.1);
}

.about-card h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
}

.about-card p {
    font-size: 0.92rem;
    color: var(--steel);
    line-height: 1.7;
}

/* ============================================
   STATS SECTION
   ============================================ */
.stats-section {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(198, 40, 40, 0.08) 0%, rgba(15, 52, 96, 0.15) 100%);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item {
    position: relative;
}

.stat-item::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: var(--glass-border);
}

.stat-item:last-child::after {
    display: none;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 900;
    color: var(--white);
    display: inline;
}

.stat-suffix {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    color: var(--accent);
    display: inline;
}

.stat-label {
    font-size: 0.88rem;
    color: var(--steel);
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 500;
}

/* ============================================
   PRODUCTS SECTION
   ============================================ */
.product-filters {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 24px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: transparent;
    color: var(--steel);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--white);
}

.filter-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--white);
    box-shadow: 0 4px 16px rgba(198, 40, 40, 0.3);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    transition: all var(--transition-slow);
    backdrop-filter: blur(10px);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(233, 69, 96, 0.2);
}

.product-image {
    position: relative;
    height: 280px;
    overflow: hidden;
    background: linear-gradient(135deg, #0d1b2a, #1b2838);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-overlay {
    position: absolute;
    top: 16px;
    left: 16px;
}

.product-tag {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 5px 14px;
    border-radius: 6px;
    background: var(--gradient-primary);
    color: var(--white);
}

.product-tag.hot {
    background: linear-gradient(135deg, #FF6B35, #E94560);
}

.product-info {
    padding: 24px;
}

.product-category {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 8px;
    display: block;
}

.product-name {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.product-desc {
    font-size: 0.88rem;
    color: var(--steel);
    margin-bottom: 20px;
    line-height: 1.6;
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.product-price {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--white);
}

.btn-cart {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(233, 69, 96, 0.1);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-cart:hover {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: transparent;
    transform: scale(1.1);
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.features {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-2) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 36px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
    transition: all var(--transition-slow);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(233, 69, 96, 0.2);
    box-shadow: var(--shadow-hover);
}

.feature-number {
    position: absolute;
    top: 16px;
    right: 24px;
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.03);
    line-height: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    border-radius: 14px;
    background: rgba(233, 69, 96, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    background: var(--gradient-primary);
    color: var(--white);
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--steel);
    line-height: 1.7;
}

/* ============================================
   TESTIMONIALS SECTION
   ============================================ */
.testimonials {
    background: linear-gradient(180deg, var(--dark-2) 0%, var(--dark) 100%);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 36px;
    transition: all var(--transition-slow);
    backdrop-filter: blur(10px);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    right: 28px;
    font-family: var(--font-heading);
    font-size: 5rem;
    color: rgba(233, 69, 96, 0.08);
    line-height: 1;
}

.testimonial-card:hover {
    transform: translateY(-6px);
    border-color: rgba(233, 69, 96, 0.2);
    box-shadow: var(--shadow-hover);
}

.testimonial-stars {
    color: #FFB800;
    font-size: 1rem;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.testimonial-text {
    font-size: 0.95rem;
    color: var(--steel-light);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--white);
}

.author-info strong {
    display: block;
    color: var(--white);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
}

.author-info span {
    font-size: 0.8rem;
    color: var(--steel);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    background: var(--dark);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 18px 20px 8px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--white);
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    outline: none;
    transition: all var(--transition-normal);
    resize: none;
}

.form-group textarea {
    min-height: 120px;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.1);
}

.form-group label {
    position: absolute;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    font-size: 0.9rem;
    color: var(--steel);
    pointer-events: none;
    transition: all var(--transition-normal);
}

.form-group textarea ~ label {
    top: 18px;
    transform: none;
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label {
    top: 10px;
    transform: none;
    font-size: 0.7rem;
    color: var(--accent);
}

.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: 6px;
    font-size: 0.7rem;
    color: var(--accent);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-info-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    transition: all var(--transition-normal);
}

.contact-info-card:hover {
    border-color: rgba(233, 69, 96, 0.2);
    transform: translateX(4px);
}

.contact-icon {
    width: 52px;
    height: 52px;
    min-width: 52px;
    border-radius: 14px;
    background: rgba(233, 69, 96, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
}

.contact-info-card strong {
    display: block;
    color: var(--white);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.contact-info-card p {
    font-size: 0.88rem;
    color: var(--steel);
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.social-link {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--steel);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-4px);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: #12121F;
    padding: 80px 0 0;
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--glass-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--steel);
    line-height: 1.7;
    max-width: 300px;
}

.footer-links-group h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-links-group ul {
    list-style: none;
}

.footer-links-group li {
    margin-bottom: 10px;
}

.footer-links-group a {
    text-decoration: none;
    color: var(--steel);
    font-size: 0.88rem;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
}

.footer-links-group a:hover {
    color: var(--accent);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.82rem;
    color: var(--steel);
}

/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 80px 0;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 8px;
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-link {
        font-size: 1.2rem;
        padding: 12px 32px;
    }

    .nav-toggle {
        display: flex;
        z-index: 1000;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .stat-item::after {
        display: none;
    }

    .product-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .hero-title {
        font-size: clamp(4rem, 18vw, 8rem);
    }

    .hero-tagline {
        letter-spacing: 6px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 4.5rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
        max-width: 280px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .product-filters {
        gap: 6px;
    }

    .filter-btn {
        padding: 8px 16px;
        font-size: 0.8rem;
    }
}

/* ============================================
   SIZE SELECTOR PILLS
   ============================================ */
.size-pills {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.size-pill {
    font-family: var(--font-heading);
    font-size: 0.72rem;
    font-weight: 500;
    padding: 5px 14px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: transparent;
    color: var(--steel);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.size-pill:hover {
    border-color: var(--accent);
    color: var(--white);
}

.size-pill.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--white);
    box-shadow: 0 2px 10px rgba(198, 40, 40, 0.3);
}

/* --- Product Image Transition --- */
.product-image img {
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

/* --- Product View Hint --- */
.product-view-hint {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: var(--white);
    font-family: var(--font-heading);
    font-size: 0.82rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    opacity: 0;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.product-card:hover .product-view-hint {
    opacity: 1;
    transform: translateY(0);
}

.product-image {
    cursor: pointer;
}

/* ============================================
   CART FLOATING BUTTON
   ============================================ */
.cart-float {
    position: fixed;
    bottom: 100px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 998;
    box-shadow: 0 4px 20px rgba(198, 40, 40, 0.5);
    transition: all var(--transition-normal);
}

.cart-float:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 30px rgba(198, 40, 40, 0.6);
}

.cart-float.cart-bounce {
    animation: cartBounce 0.5s ease;
}

@keyframes cartBounce {
    0%, 100% { transform: scale(1); }
    30% { transform: scale(1.3); }
    60% { transform: scale(0.9); }
}

.cart-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 22px;
    height: 22px;
    border-radius: 11px;
    background: #FF6B35;
    color: white;
    font-family: var(--font-heading);
    font-size: 0.72rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.5);
    animation: badgePop 0.3s ease;
}

@keyframes badgePop {
    0% { transform: scale(0); }
    70% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* ============================================
   CART PANEL (Slide-out)
   ============================================ */
.cart-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.cart-overlay.open {
    opacity: 1;
    visibility: visible;
}

.cart-panel {
    position: fixed;
    top: 0;
    right: -420px;
    width: 400px;
    max-width: 90vw;
    height: 100vh;
    background: var(--dark);
    border-left: 1px solid var(--glass-border);
    z-index: 1101;
    display: flex;
    flex-direction: column;
    transition: right var(--transition-slow);
    box-shadow: -8px 0 40px rgba(0, 0, 0, 0.4);
}

.cart-panel.open {
    right: 0;
}

.cart-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--glass-border);
}

.cart-panel-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
}

.cart-close-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    background: transparent;
    color: var(--steel);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.cart-close-btn:hover {
    border-color: var(--accent);
    color: var(--white);
    background: rgba(233, 69, 96, 0.1);
}

.cart-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px 24px;
}

.cart-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--steel);
}

.cart-empty svg {
    opacity: 0.3;
    margin-bottom: 16px;
}

.cart-empty p {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--steel-light);
    margin-bottom: 8px;
}

.cart-empty small {
    font-size: 0.82rem;
    color: var(--steel);
}

/* Cart Items */
.cart-item {
    display: flex;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--glass-border);
    align-items: flex-start;
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-img {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    object-fit: cover;
    background: var(--surface);
    flex-shrink: 0;
}

.cart-item-info {
    flex: 1;
    min-width: 0;
}

.cart-item-name {
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cart-item-size {
    font-size: 0.75rem;
    color: var(--accent);
    margin-bottom: 4px;
}

.cart-item-price {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--steel-light);
}

.cart-item-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    flex-shrink: 0;
}

.cart-qty-control {
    display: flex;
    align-items: center;
    gap: 0;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    overflow: hidden;
}

.cart-qty-btn {
    width: 30px;
    height: 30px;
    border: none;
    background: var(--surface);
    color: var(--steel-light);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.cart-qty-btn:hover:not(:disabled) {
    background: var(--accent);
    color: var(--white);
}

.cart-qty-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.cart-qty-value {
    width: 32px;
    text-align: center;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--white);
    background: var(--dark-2);
}

.cart-remove-btn {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--steel);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.cart-remove-btn:hover {
    color: #FF5252;
    background: rgba(255, 82, 82, 0.1);
}

/* Cart Footer */
.cart-panel-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--glass-border);
    background: var(--dark-2);
}

.cart-total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-family: var(--font-heading);
}

.cart-total-row span {
    font-size: 0.92rem;
    color: var(--steel-light);
}

.cart-total-row strong {
    font-size: 1.2rem;
    color: var(--white);
}

.cart-zalo-btn {
    margin-bottom: 10px;
    background: linear-gradient(135deg, #0068FF, #0088FF) !important;
    box-shadow: 0 4px 16px rgba(0, 104, 255, 0.4) !important;
}

.cart-zalo-btn:hover {
    box-shadow: 0 8px 24px rgba(0, 104, 255, 0.6) !important;
}

.cart-clear-btn {
    font-size: 0.82rem;
    padding: 10px;
    opacity: 0.7;
}

/* ============================================
   CART TOAST NOTIFICATION
   ============================================ */
.cart-toast {
    position: fixed;
    bottom: 170px;
    right: 24px;
    padding: 12px 24px;
    border-radius: 12px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--white);
    background: rgba(30, 42, 74, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    z-index: 999;
    transform: translateY(20px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.cart-toast.show {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.cart-toast.success {
    border-color: rgba(46, 125, 50, 0.5);
}

.cart-toast.warning {
    border-color: rgba(255, 183, 0, 0.5);
}

/* ============================================
   ZALO FLOATING BUTTON
   ============================================ */
.zalo-float {
    position: fixed;
    bottom: 24px;
    left: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: #0068FF;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 998;
    box-shadow: 0 4px 20px rgba(0, 104, 255, 0.5);
    transition: all var(--transition-normal);
    text-decoration: none;
    overflow: hidden;
}

.zalo-float:hover {
    width: auto;
    border-radius: 28px;
    padding: 0 20px;
    gap: 8px;
    box-shadow: 0 8px 30px rgba(0, 104, 255, 0.6);
    transform: scale(1.05);
}

.zalo-float::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid rgba(0, 104, 255, 0.4);
    animation: zaloPulse 2s infinite;
}

.zalo-float:hover::before {
    border-radius: 32px;
}

@keyframes zaloPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.15); opacity: 0; }
}

.zalo-float-text {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
    white-space: nowrap;
    max-width: 0;
    overflow: hidden;
    opacity: 0;
    transition: all 0.3s ease;
}

.zalo-float:hover .zalo-float-text {
    max-width: 100px;
    opacity: 1;
}

/* Zalo card in contact section */
.zalo-card {
    text-decoration: none;
    border-color: rgba(0, 104, 255, 0.3) !important;
    background: linear-gradient(145deg, rgba(0, 104, 255, 0.08) 0%, rgba(22, 33, 62, 0.4) 100%) !important;
}

.zalo-card:hover {
    border-color: #0068FF !important;
    background: linear-gradient(145deg, rgba(0, 104, 255, 0.15) 0%, rgba(22, 33, 62, 0.4) 100%) !important;
}

.zalo-icon {
    background: rgba(0, 104, 255, 0.15) !important;
    color: #0068FF !important;
}

/* ============================================
   PRODUCT DETAIL MODAL
   ============================================ */
.product-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 1200;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.product-modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.product-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    background: var(--dark);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    z-index: 1201;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.product-modal.open {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(26, 26, 46, 0.9);
    backdrop-filter: blur(10px);
    color: var(--steel);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2;
    transition: all var(--transition-normal);
}

.modal-close:hover {
    border-color: var(--accent);
    color: var(--white);
    background: rgba(233, 69, 96, 0.2);
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-image {
    background: linear-gradient(135deg, #0d1b2a, #1b2838);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 350px;
    overflow: hidden;
}

.modal-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.2s ease;
}

.modal-info {
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-category {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--accent);
    display: block;
}

.modal-name {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
}

.modal-desc {
    font-size: 0.92rem;
    color: var(--steel);
    line-height: 1.7;
}

.modal-sizes {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.modal-sizes label {
    font-family: var(--font-heading);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--steel-light);
}

.modal-size-pills {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.modal-price-row {
    margin-top: 8px;
}

.modal-price {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
}

.modal-qty-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

.modal-qty-row label {
    font-family: var(--font-heading);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--steel-light);
}

.modal-qty-control {
    display: flex;
    align-items: center;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    overflow: hidden;
}

.modal-qty-control .cart-qty-btn {
    width: 36px;
    height: 36px;
}

.modal-qty-control .cart-qty-value {
    width: 40px;
    font-size: 0.95rem;
    line-height: 36px;
}

.modal-add-btn {
    margin-top: auto;
}

/* ============================================
   RESPONSIVE — NEW ELEMENTS
   ============================================ */
@media (max-width: 768px) {
    .cart-float {
        bottom: 80px;
        right: 16px;
        width: 50px;
        height: 50px;
    }

    .zalo-float {
        bottom: 16px;
        left: 16px;
        width: 50px;
        height: 50px;
    }

    .cart-panel {
        width: 100%;
        max-width: none;
        right: -100%;
    }

    .modal-body {
        grid-template-columns: 1fr;
    }

    .modal-image {
        min-height: 250px;
    }

    .modal-info {
        padding: 24px;
    }

    .modal-name {
        font-size: 1.3rem;
    }

    .product-modal {
        width: 95%;
        max-height: 95vh;
        border-radius: 16px;
    }

    .cart-toast {
        bottom: 140px;
        right: 16px;
        left: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .modal-info {
        padding: 20px;
    }

    .modal-price {
        font-size: 1.2rem;
    }

    .zalo-float:hover {
        width: 50px;
        padding: 0;
        border-radius: 50%;
    }

    .zalo-float:hover .zalo-float-text {
        max-width: 0;
        opacity: 0;
    }
}