/* ============================================================
   THE RI PUBLICATION - COMPLETE STYLESHEET
   ============================================================ */

/* ---------- CSS VARIABLES ---------- */
:root {
    --primary: #0B2D6B;
    --primary-light: #1A4A8A;
    --secondary: #D4AF37;
    --secondary-light: #E8C84A;
    --accent: #E53935;
    --bg: #F8FAFE;
    --card: #FFFFFF;
    --text: #0B1A33;
    --text-light: #4A5568;
    --shadow: 0 12px 40px rgba(11,45,107,0.08);
    --shadow-hover: 0 24px 60px rgba(11,45,107,0.15);
    --radius: 24px;
    --radius-sm: 16px;
    --glass: rgba(255,255,255,0.72);
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- LOADER ---------- */
#loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    transition: opacity 0.6s, visibility 0.6s;
}

#loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-book {
    font-size: 4rem;
    animation: loaderBounce 1s ease-in-out infinite;
}

.loader-text {
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0.8;
}

.loader-bar {
    width: 200px;
    height: 3px;
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
    overflow: hidden;
}

.loader-bar-fill {
    width: 40%;
    height: 100%;
    background: var(--secondary);
    border-radius: 4px;
    animation: loaderFill 1.2s ease-in-out infinite;
}

@keyframes loaderBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-16px); }
}

@keyframes loaderFill {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

/* ============================================================ */
/* LOGO - LEFT SIDE WITH ROTATION */
/* ============================================================ */

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo-wrapper-left {
    position: relative;
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(212,175,55,0.3);
    transform-style: preserve-3d;
    perspective: 800px;
    animation: logoFlip 4s ease-in-out infinite;
}

.logo-wrapper-left::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(255,255,255,0) 30%,
        rgba(255,255,255,0.3) 50%,
        rgba(255,255,255,0) 70%
    );
    transform: translateX(-100%) rotate(25deg);
    animation: logoShine 3s ease-in-out infinite;
    z-index: 2;
    border-radius: 50%;
}

.logo-image-left {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
    background: white;
    padding: 4px;
    backface-visibility: hidden;
}

@keyframes logoFlip {
    0% { transform: rotateY(0deg); }
    50% { transform: rotateY(180deg); }
    100% { transform: rotateY(360deg); }
}

@keyframes logoShine {
    0% { transform: translateX(-100%) rotate(25deg); }
    50% { transform: translateX(200%) rotate(25deg); }
    100% { transform: translateX(200%) rotate(25deg); }
}

.logo-wrapper-left:hover {
    animation-play-state: paused;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary);
}

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

.logo-text small {
    font-size: 0.5rem;
    font-weight: 400;
    opacity: 0.6;
    display: block;
    letter-spacing: 0.06em;
}

/* ---------- HEADER ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: var(--glass);
    border-bottom: 1px solid rgba(11,45,107,0.06);
    padding: 8px 0;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 4px 30px rgba(11,45,107,0.08);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

/* ---------- NAVIGATION ---------- */
.nav {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

.nav a {
    font-weight: 500;
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 40px;
    transition: var(--transition);
    color: var(--text);
}

.nav a:hover,
.nav a.active {
    background: var(--primary);
    color: white;
}

.nav a i {
    margin-right: 4px;
}

/* ---------- SEARCH BAR ---------- */
.search-bar {
    display: flex;
    align-items: center;
    background: var(--card);
    border-radius: 40px;
    padding: 2px 14px;
    gap: 10px;
    box-shadow: 0 2px 12px rgba(11,45,107,0.06);
    border: 1px solid rgba(11,45,107,0.06);
    transition: var(--transition);
}

.search-bar:focus-within {
    border-color: var(--secondary);
    box-shadow: 0 2px 20px rgba(212,175,55,0.15);
}

.search-bar input {
    border: none;
    background: transparent;
    padding: 8px 0;
    outline: none;
    font-family: inherit;
    color: var(--text);
    width: 140px;
    font-size: 0.85rem;
}

.search-bar input::placeholder {
    color: #A0AEC0;
}

.search-bar button {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.9rem;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--primary);
    cursor: pointer;
}

/* ---------- HERO SECTION ---------- */
.hero {
    background: linear-gradient(145deg, var(--primary) 0%, #0D3B7A 50%, var(--primary-light) 100%);
    color: white;
    padding: 60px 0;
    border-radius: 0 0 48px 48px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.hero-bg-shapes {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(212,175,55,0.05);
}

.shape-1 {
    width: 400px;
    height: 400px;
    top: -200px;
    right: -100px;
}

.shape-2 {
    width: 300px;
    height: 300px;
    bottom: -150px;
    left: -100px;
    background: rgba(255,255,255,0.03);
}

.shape-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    right: 20%;
    background: rgba(212,175,55,0.04);
}

.hero-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
    justify-content: space-between;
}

.hero-text {
    flex: 1 1 500px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(212,175,55,0.15);
    border: 1px solid rgba(212,175,55,0.25);
    padding: 6px 18px;
    border-radius: 40px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--secondary-light);
    margin-bottom: 16px;
    letter-spacing: 0.04em;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 4px;
    color: white;
}

.hero h1 .highlight {
    color: var(--secondary);
}

.hero .hero-subtitle {
    font-size: 1rem;
    opacity: 0.7;
    font-weight: 400;
    margin-bottom: 8px;
    color: rgba(255,255,255,0.8);
}

.hero .hero-desc {
    font-size: 1.15rem;
    opacity: 0.85;
    max-width: 600px;
    margin-bottom: 16px;
    color: white;
}

.hero-series {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 12px 0 20px;
}

.series-pill {
    padding: 4px 16px;
    border-radius: 40px;
    font-weight: 700;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: var(--transition);
    cursor: pointer;
}

.series-pill:hover {
    transform: translateY(-2px);
}

.series-pill.mcq {
    background: #1565C0;
    color: white;
}

.series-pill.subjective {
    background: #2E7D32;
    color: white;
}

.series-pill.notes {
    background: #E65100;
    color: white;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin: 16px 0 24px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--secondary);
}

.stat-label {
    font-size: 0.8rem;
    opacity: 0.7;
}

.stat-future {
    font-size: 0.55rem;
    opacity: 0.5;
    font-weight: 400;
    margin-top: 2px;
    color: rgba(255,255,255,0.6);
    letter-spacing: 0.04em;
}

.hero-image {
    flex: 0 0 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-book-stack {
    position: relative;
    width: 160px;
    height: 200px;
}

.book-stack-item {
    position: absolute;
    width: 100px;
    height: 120px;
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.book-stack-item:hover {
    transform: translateY(-5px) !important;
    color: rgba(255,255,255,0.8);
}

/* ---------- BUTTONS ---------- */
.btn {
    padding: 12px 32px;
    border-radius: 60px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--secondary);
    color: var(--primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(212,175,55,0.35);
}

.btn-outline {
    background: transparent;
    border: 2px solid rgba(255,255,255,0.4);
    color: white;
}

.btn-outline:hover {
    background: white;
    color: var(--primary);
    border-color: white;
    transform: translateY(-3px);
}

/* ---------- SECTION TITLES ---------- */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin: 44px 0 8px;
}

.section-title-wrapper {
    display: flex;
    align-items: center;
    gap: 14px;
}

.section-number {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--secondary);
    background: rgba(212,175,55,0.12);
    padding: 4px 12px;
    border-radius: 40px;
    letter-spacing: 0.06em;
}

.section-title {
    font-size: 1.6rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title i {
    font-size: 1.4rem;
}

.section-desc {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.section-desc.center {
    text-align: center;
}

.section-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--secondary);
    background: rgba(212,175,55,0.12);
    padding: 4px 16px;
    border-radius: 40px;
}

.section-title-large {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 8px 0;
}

.section-header.center {
    flex-direction: column;
    text-align: center;
}

/* ---------- BADGES ---------- */
.badge {
    font-size: 0.65rem;
    padding: 4px 14px;
    border-radius: 40px;
    font-weight: 600;
    color: white;
    white-space: nowrap;
}

.badge.mcq { background: #1565C0; }
.badge.subjective { background: #2E7D32; }
.badge.notes { background: #E65100; }

/* ---------- CAROUSEL ---------- */
.carousel-wrapper {
    position: relative;
    margin: 8px 0 20px;
}

.carousel-container {
    overflow-x: auto;
    overflow-y: hidden;
    display: flex;
    gap: 24px;
    padding: 12px 4px 28px;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--secondary) transparent;
}

.carousel-container::-webkit-scrollbar {
    height: 4px;
}

.carousel-container::-webkit-scrollbar-track {
    background: transparent;
}

.carousel-container::-webkit-scrollbar-thumb {
    background: var(--secondary);
    border-radius: 20px;
}

.carousel-item {
    flex: 0 0 210px;
    min-width: 190px;
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px 16px 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(11,45,107,0.04);
    position: relative;
}

.carousel-item::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    padding: 1px;
    background: linear-gradient(135deg, rgba(212,175,55,0.2), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.carousel-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(212,175,55,0.15);
}

.carousel-item .book-cover {
    aspect-ratio: 3/4;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 12px;
    background: linear-gradient(145deg, #E6EEF9, #F0F4FA);
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
    transition: var(--transition);
}

.carousel-item:hover .book-cover {
    transform: scale(1.02);
}

.carousel-item .book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-item .series-tag {
    font-size: 0.5rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.carousel-item .series-tag.mcq { color: #1565C0; }
.carousel-item .series-tag.subjective { color: #2E7D32; }
.carousel-item .series-tag.notes { color: #E65100; }

.carousel-item h4 {
    font-size: 0.85rem;
    font-weight: 700;
    margin: 2px 0;
    line-height: 1.2;
}

.carousel-item .subject {
    font-size: 0.75rem;
    opacity: 0.6;
}

.carousel-item .price {
    font-weight: 700;
    color: #C62828;
    margin: 4px 0 10px;
    font-size: 0.95rem;
}

.carousel-item .actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

/* ---------- SMALL BUTTONS ---------- */
.btn-xs {
    padding: 5px 14px;
    border-radius: 40px;
    font-size: 0.65rem;
    border: none;
    font-weight: 600;
    cursor: pointer;
    background: var(--primary);
    color: white;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-xs:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(11,45,107,0.2);
}

.btn-xs-outline {
    background: transparent;
    border: 1.5px solid var(--primary);
    color: var(--primary);
}

.btn-xs-outline:hover {
    background: var(--primary);
    color: white;
}

.btn-xs-demo {
    background: #1565C0;
    color: white;
}

.btn-xs-demo:hover {
    background: #0D47A1;
}

/* ---------- SCROLL BUTTONS ---------- */
.scroll-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    background: var(--card);
    color: var(--primary);
    border: 1px solid rgba(11,45,107,0.06);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-50%) scale(1.05);
}

.scroll-btn.left { left: -8px; }
.scroll-btn.right { right: -8px; }

/* ---------- WHY CHOOSE ---------- */
.why-choose {
    margin: 60px 0 40px;
    padding: 40px;
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.why-card {
    text-align: center;
    padding: 24px 16px;
    border-radius: var(--radius-sm);
    background: var(--bg);
    transition: var(--transition);
}

.why-card:hover {
    transform: translateY(-4px);
    background: white;
    box-shadow: var(--shadow);
}

.why-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(212,175,55,0.1);
    color: var(--secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin: 0 auto 12px;
}

.why-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.why-card p {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ---------- INFO GRID ---------- */
.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 40px 0;
}

.info-card {
    background: var(--card);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.info-card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.info-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.info-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 4px 0;
}

.info-card blockquote {
    font-style: italic;
    color: var(--primary);
    border-left: 3px solid var(--secondary);
    padding-left: 16px;
    margin: 12px 0;
    font-size: 0.95rem;
}

.info-card .btn {
    margin-top: 12px;
}

.app-btn {
    background: var(--primary);
    color: white;
}

.app-btn:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
}

.youtube-btn {
    background: #FF0000;
    color: white;
}

.youtube-btn:hover {
    background: #CC0000;
    transform: translateY(-3px);
}

/* ---------- ORDER MODAL ---------- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-box {
    background: var(--card);
    border-radius: var(--radius);
    max-width: 520px;
    width: 100%;
    padding: 32px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 40px 80px rgba(0,0,0,0.25);
    animation: modalIn 0.3s ease;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--accent);
    transform: rotate(90deg);
}

@keyframes modalIn {
    from { transform: scale(0.9) translateY(20px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-box h2 {
    font-size: 1.4rem;
    margin-bottom: 4px;
    color: var(--primary);
}

.modal-box .book-name {
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 12px;
}

.modal-box label {
    font-weight: 600;
    font-size: 0.8rem;
    display: block;
    margin: 10px 0 4px;
    color: var(--text);
}

.modal-box input,
.modal-box textarea,
.modal-box select {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid #E2E8F0;
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--bg);
    color: var(--text);
}

.modal-box input:focus,
.modal-box textarea:focus,
.modal-box select:focus {
    border-color: var(--secondary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(212,175,55,0.1);
}

.modal-box textarea {
    resize: vertical;
    min-height: 60px;
}

.modal-box .btn-group {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.modal-box .btn-group .btn {
    flex: 1;
    justify-content: center;
}

.btn-close-modal {
    background: #E2E8F0;
    color: var(--text);
}

.btn-close-modal:hover {
    background: #CBD5E1;
}

.btn-send-order {
    background: #25D366;
    color: white;
}

.btn-send-order:hover {
    background: #1DA851;
    transform: translateY(-2px);
}

.modal-box .min-order-note {
    background: #FFF3E0;
    padding: 8px 14px;
    border-radius: 12px;
    font-size: 0.8rem;
    color: #E65100;
    margin: 6px 0 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ---------- WHATSAPP FLOAT ---------- */
.float-wa {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 99;
    background: #25D366;
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 8px 32px rgba(37,211,102,0.4);
    transition: var(--transition);
    animation: wa-pulse 2.5s infinite;
}

.float-wa:hover {
    transform: scale(1.08);
    animation: none;
}

.float-wa .tooltip {
    position: absolute;
    right: 74px;
    background: var(--primary);
    color: white;
    padding: 6px 16px;
    border-radius: 40px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.float-wa:hover .tooltip {
    opacity: 1;
}

@keyframes wa-pulse {
    0% { box-shadow: 0 0 0 0 rgba(37,211,102,0.4); }
    70% { box-shadow: 0 0 0 16px rgba(37,211,102,0); }
    100% { box-shadow: 0 0 0 0 rgba(37,211,102,0); }
}

/* ---------- SCROLL TOP ---------- */
.scroll-top {
    position: fixed;
    bottom: 100px;
    right: 28px;
    z-index: 98;
    background: var(--primary);
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--secondary);
    color: var(--primary);
    transform: translateY(-3px);
}

/* ---------- FOOTER ---------- */
.footer {
    background: var(--primary);
    color: #E8EEF5;
    padding: 40px 0 20px;
    margin-top: 40px;
    border-radius: 48px 48px 0 0;
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-brand {
    flex: 1 1 200px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-col h5 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    opacity: 0.6;
    margin-bottom: 8px;
}

.footer-col a {
    opacity: 0.7;
    transition: var(--transition);
    display: block;
    font-size: 0.9rem;
    padding: 3px 0;
    cursor: pointer;
}

.footer-col a:hover {
    opacity: 1;
    color: var(--secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    font-size: 0.85rem;
    opacity: 0.5;
}

/* ============================================================ */
/* RESPONSIVE - ALL DEVICES */
/* ============================================================ */

/* ---------- MOBILE (0px - 480px) ---------- */
@media (max-width: 480px) {
    .logo-wrapper-left {
        width: 38px;
        height: 38px;
    }
    .logo-text {
        font-size: 1rem;
    }
    .logo-text small {
        font-size: 0.4rem;
    }
    .logo {
        gap: 8px;
    }
    .nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 0;
    }
    .nav.open {
        display: flex;
    }
    .nav a {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    .search-bar {
        width: 100%;
    }
    .search-bar input {
        width: 100%;
    }
    .mobile-toggle {
        display: block;
    }
    .hero {
        padding: 30px 0 20px;
    }
    .hero h1 {
        font-size: 1.6rem;
    }
    .hero .hero-subtitle {
        font-size: 0.75rem;
    }
    .hero .hero-desc {
        font-size: 0.9rem;
    }
    .hero-cta .btn {
        width: 100%;
        justify-content: center;
        font-size: 0.85rem;
    }
    .hero-stats {
        gap: 10px;
        flex-wrap: wrap;
    }
    .stat-number {
        font-size: 1.2rem;
    }
    .stat-label {
        font-size: 0.65rem;
    }
    .stat-future {
        font-size: 0.4rem;
    }
    .hero-image {
        display: none;
    }
    .section-title {
        font-size: 1.1rem;
    }
    .section-title-large {
        font-size: 1.4rem;
    }
    .section-number {
        display: none;
    }
    .carousel-item {
        flex: 0 0 150px;
        min-width: 130px;
    }
    .carousel-item h4 {
        font-size: 0.75rem;
    }
    .carousel-item .price {
        font-size: 0.8rem;
    }
    .btn-xs {
        font-size: 0.55rem;
        padding: 4px 10px;
    }
    .why-choose {
        padding: 20px;
        margin: 30px 0 20px;
    }
    .why-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .why-card {
        padding: 16px;
    }
    .info-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        margin: 20px 0;
    }
    .info-card {
        padding: 20px;
    }
    .info-card h3 {
        font-size: 1rem;
    }
    .float-wa {
        width: 48px;
        height: 48px;
        font-size: 1.4rem;
        bottom: 14px;
        right: 14px;
    }
    .scroll-top {
        width: 38px;
        height: 38px;
        font-size: 1rem;
        bottom: 76px;
        right: 14px;
    }
    .footer {
        border-radius: 32px 32px 0 0;
        padding: 24px 0 16px;
    }
    .footer-top {
        flex-direction: column;
        gap: 16px;
    }
    .footer-links {
        gap: 16px;
    }
    .footer-col a {
        font-size: 0.8rem;
    }
    .modal-box {
        padding: 16px;
    }
    .modal-box h2 {
        font-size: 1.1rem;
    }
    .modal-box .btn-group {
        flex-direction: column;
    }
    .modal-box .btn-group .btn {
        width: 100%;
    }
    .header {
        padding: 4px 0;
    }
    .carousel-container {
        gap: 14px;
    }
}

/* ---------- TABLET (481px - 768px) ---------- */
@media (min-width: 481px) and (max-width: 768px) {
    .logo-wrapper-left {
        width: 44px;
        height: 44px;
    }
    .logo-text {
        font-size: 1.2rem;
    }
    .header-inner {
        flex-wrap: wrap;
    }
    .nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 0;
    }
    .nav.open {
        display: flex;
    }
    .nav a {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
    .search-bar {
        width: 100%;
    }
    .search-bar input {
        width: 100%;
    }
    .mobile-toggle {
        display: block;
    }
    .hero {
        padding: 40px 0 30px;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero .hero-subtitle {
        font-size: 0.85rem;
    }
    .hero .hero-desc {
        font-size: 1rem;
    }
    .hero-stats {
        gap: 16px;
        flex-wrap: wrap;
    }
    .stat-number {
        font-size: 1.4rem;
    }
    .stat-future {
        font-size: 0.45rem;
    }
    .hero-image {
        display: none;
    }
    .section-title {
        font-size: 1.3rem;
    }
    .section-title-large {
        font-size: 1.6rem;
    }
    .info-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .why-grid {
        grid-template-columns: 1fr 1fr;
    }
    .carousel-item {
        flex: 0 0 160px;
        min-width: 140px;
    }
    .scroll-btn {
        display: none;
    }
    .float-wa {
        width: 52px;
        height: 52px;
        font-size: 1.6rem;
        bottom: 16px;
        right: 16px;
    }
    .footer-top {
        flex-direction: column;
        gap: 20px;
    }
    .footer-links {
        gap: 20px;
    }
    .modal-box {
        padding: 20px;
    }
    .section-number {
        display: none;
    }
}

/* ---------- LAPTOP (769px - 1024px) ---------- */
@media (min-width: 769px) and (max-width: 1024px) {
    .logo-wrapper-left {
        width: 48px;
        height: 48px;
    }
    .hero h1 {
        font-size: 2.6rem;
    }
    .hero-stats {
        gap: 24px;
    }
    .hero-image {
        display: none;
    }
    .info-grid {
        grid-template-columns: 1fr 1fr;
    }
    .carousel-item {
        flex: 0 0 190px;
        min-width: 170px;
    }
    .search-bar input {
        width: 110px;
    }
}

/* ---------- DESKTOP (1025px+) ---------- */
@media (min-width: 1025px) {
    .logo-wrapper-left {
        width: 54px;
        height: 54px;
    }
    .logo-text {
        font-size: 1.5rem;
    }
    .hero h1 {
        font-size: 3.2rem;
    }
    .hero-image {
        flex: 0 0 220px;
    }
    .hero-book-stack {
        width: 180px;
        height: 220px;
    }
    .book-stack-item {
        width: 110px;
        height: 130px;
        font-size: 3.2rem;
    }
    .carousel-item {
        flex: 0 0 210px;
        min-width: 190px;
    }
}

/* ---------- TV / LARGE SCREEN (1920px+) ---------- */
@media (min-width: 1920px) {
    .container {
        max-width: 1400px;
        padding: 0 40px;
    }
    .logo-wrapper-left {
        width: 64px;
        height: 64px;
    }
    .logo-text {
        font-size: 1.8rem;
    }
    .hero {
        padding: 80px 0;
        border-radius: 0 0 64px 64px;
    }
    .hero h1 {
        font-size: 4rem;
    }
    .hero .hero-subtitle {
        font-size: 1.2rem;
    }
    .hero .hero-desc {
        font-size: 1.4rem;
    }
    .hero-image {
        flex: 0 0 280px;
    }
    .hero-book-stack {
        width: 220px;
        height: 260px;
    }
    .book-stack-item {
        width: 140px;
        height: 160px;
        font-size: 4rem;
    }
    .section-title {
        font-size: 2.2rem;
    }
    .section-title-large {
        font-size: 2.8rem;
    }
    .carousel-item {
        flex: 0 0 240px;
        min-width: 220px;
    }
    .info-grid {
        gap: 40px;
    }
    .footer {
        border-radius: 64px 64px 0 0;
        padding: 50px 0 30px;
    }
    .hero-stats {
        gap: 50px;
    }
    .stat-number {
        font-size: 2.2rem;
    }
}