/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-dark: #121212; /* Softer pure dark, easier on the eyes */
    --card-bg: rgba(24, 24, 27, 0.7); /* Zinc 900 */
    --card-border: rgba(255, 255, 255, 0.08);
    --card-border-hover: rgba(228, 76, 22, 0.3); /* KMITL Orange subtle border */
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;

    /* KMITL Theme Colors */
    --color-primary: #E44C16;
    --color-primary-rgb: 228, 76, 22;
    --color-primary-light: #F97316;
    
    /* Map old variables to KMITL Orange so existing HTML tags adopt the new theme smoothly */
    --color-blue: var(--color-primary); 
    --color-blue-rgb: var(--color-primary-rgb);
    
    --color-green: #10B981;
    --color-green-rgb: 16, 185, 129;
    --color-orange: #F59E0B;
    --color-orange-rgb: 245, 158, 11;
    --color-red: #EF4444;
    --color-red-rgb: 239, 68, 68;

    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --shadow-premium: 0 20px 40px -10px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.03);
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: 'Prompt', sans-serif;
    overflow-x: hidden;
    line-height: 1.6;
    background-image: 
        radial-gradient(circle at 15% 0%, rgba(228, 76, 22, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 85% 100%, rgba(249, 115, 22, 0.03) 0%, transparent 40%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* Utility Classes */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-premium);
}

.fade-up {
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
    transform: translateY(20px);
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* App Header styling */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(18, 18, 18, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.logo-accent {
    color: var(--color-primary);
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a.active {
    color: var(--color-primary);
    font-weight: 600;
}

.header-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.02);
}

.btn-text-desktop, .badge-text-desktop { display: inline; }
.btn-text-mobile, .badge-text-mobile { display: none; }

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-primary);
    box-shadow: 0 0 12px rgba(228, 76, 22, 0.6);
}

.scroll-progress-container {
    width: 100%;
    height: 2px;
    background: transparent;
}

.scroll-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
}

/* Button UI */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
}

.btn-primary {
    background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: #fff;
    box-shadow: 0 4px 14px rgba(var(--color-primary-rgb), 0.3), inset 0 1px 0 rgba(255,255,255,0.2);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(var(--color-primary-rgb), 0.4), inset 0 1px 0 rgba(255,255,255,0.2);
    filter: brightness(1.1);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    margin-left: 12px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: rgba(255,255,255,0.15);
}

/* Hero Section */
.hero-section {
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 24px 60px;
    position: relative;
}

.hero-content {
    max-width: 860px;
    width: 100%;
}

.hero-tag {
    font-family: 'Outfit', sans-serif;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 4px;
    color: var(--color-primary-light);
    margin-bottom: 24px;
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    background: rgba(228, 76, 22, 0.1);
    border: 1px solid rgba(228, 76, 22, 0.2);
}

.hero-section h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.text-gradient {
    background: linear-gradient(90deg, var(--color-primary-light), #FCA5A5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 48px;
    font-weight: 400;
}

.choice-container {
    display: flex;
    gap: 32px;
    justify-content: center;
    align-items: stretch;
    margin-top: 40px;
    flex-wrap: wrap;
}

.choice-card {
    background: var(--card-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    text-align: left;
    transition: var(--transition-smooth);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    box-shadow: var(--shadow-premium);
    position: relative;
    overflow: hidden;
}

.choice-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 100%;
    background: radial-gradient(circle at top right, rgba(255,255,255,0.05), transparent 70%);
    opacity: 0;
    transition: var(--transition-smooth);
}

.choice-card:hover {
    transform: translateY(-8px);
    border-color: var(--card-border-hover);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255,255,255,0.1);
}

.choice-card:hover::after { opacity: 1; }

.choice-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 24px;
    color: var(--text-primary);
    font-size: 28px;
    transition: var(--transition-smooth);
    border: 1px solid rgba(255,255,255,0.05);
}

.choice-card:hover .choice-icon {
    background: var(--color-primary);
    color: #fff;
    border-color: rgba(255,255,255,0.2);
    box-shadow: 0 8px 20px rgba(var(--color-primary-rgb), 0.4);
    transform: scale(1.05);
}

.choice-title {
    color: var(--text-primary);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.choice-desc {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

.scroll-down-hint {
    position: absolute;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
}

/* Guide Layout (Vertical Feed) */
.scrolly-section {
    position: relative;
    padding: 20px 0 80px 0;
}

#scrolly-container {
    position: relative;
    display: flex;
    flex-direction: column;
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
    gap: 40px;
}

/* Redesigned Sticky Stepper Navigation Bar */
.steps-nav-wrapper {
    position: sticky;
    top: 68px; /* Offset below header */
    z-index: 100;
    padding: 16px 0;
    margin-bottom: 16px;
    width: 100%;
}

.stepper-scroll-container {
    background: rgba(24, 24, 27, 0.85);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--card-border);
    border-radius: 100px;
    padding: 8px;
    max-width: 860px;
    margin: 0 auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255,255,255,0.05);
    overflow-x: auto;
    scrollbar-width: none; /* Firefox */
}
.stepper-scroll-container::-webkit-scrollbar { display: none; }

.stepper-container-pills {
    display: flex;
    gap: 8px;
    min-width: max-content;
}

.step-pill {
    background: transparent;
    border: 1px solid transparent;
    outline: none;
    padding: 10px 20px;
    color: var(--text-secondary);
    font-family: 'Prompt', sans-serif;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 100px;
    transition: var(--transition-smooth);
}

.step-pill:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.pill-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    font-size: 12px;
    font-weight: 700;
}

.step-pill.active {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.4);
}

.step-pill.active .pill-number {
    background: rgba(255,255,255,0.2);
    color: #fff;
}


/* Steps Feed */
.doc-viewer-frame {
    background: #18181b;
    border: 1px solid var(--card-border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
    display: flex;
    flex-direction: column;
    width: 100%;
}

.doc-viewer-header {
    background: #27272a;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.window-dot { width: 12px; height: 12px; border-radius: 50%; }
.window-dot.red { background-color: #FF5F56; }
.window-dot.yellow { background-color: #FFBD2E; }
.window-dot.green { background-color: #27C93F; }

.doc-title {
    margin-left: 12px;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.image-wrapper {
    position: relative;
    width: 100%;
    background: #F8FAFC; /* Light background for the document image */
    overflow: hidden;
}

.image-wrapper img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
}

.steps-feed {
    display: flex;
    flex-direction: column;
    gap: 40px;
    width: 100%;
}

.step {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    scroll-margin-top: 150px;
}

.step-content {
    background: var(--card-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-premium);
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.step-number {
    font-family: 'Prompt', sans-serif;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 8px;
    text-transform: uppercase;
    color: var(--color-primary-light);
}

.step h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
    color: var(--text-primary);
}

.step-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.check-list-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.check-item-detail {
    display: flex;
    gap: 16px;
    padding: 20px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255,255,255,0.03);
    transition: var(--transition-smooth);
}

.check-item-detail:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}

.badge-point {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
    background-color: rgba(228, 76, 22, 0.15); 
    color: var(--color-primary); 
    border: 1px solid rgba(228, 76, 22, 0.3);
}

.item-desc {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.item-desc strong {
    font-size: 16px;
    color: var(--text-primary);
}

.item-desc span {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Sections General Styling */
.interactive-section {
    padding: 100px 24px;
    position: relative;
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title-wrap {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-title-wrap .sub-title {
    font-family: 'Outfit', sans-serif;
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 4px;
    color: var(--color-primary-light);
    display: block;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-title-wrap h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 20px;
}

.section-title-wrap p {
    font-size: 17px;
    color: var(--text-secondary);
}

/* Search Box Container */
.search-box-container {
    max-width: 500px;
    margin: 40px auto;
    position: relative;
    background: rgba(24, 24, 27, 0.4);
    padding: 24px;
    border-radius: 24px;
    border: 1px solid var(--card-border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.search-input {
    width: 100%;
    padding: 18px 24px;
    font-size: 18px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(0,0,0,0.3);
    color: var(--text-primary);
    text-align: center;
    outline: none;
    transition: var(--transition-smooth);
    font-family: 'Prompt', sans-serif;
    letter-spacing: 2px;
}

.search-input:focus {
    border-color: var(--color-primary);
    background: rgba(0,0,0,0.5);
    box-shadow: 0 0 0 4px rgba(228, 76, 22, 0.15);
}

.search-input::placeholder {
    color: var(--text-muted);
    letter-spacing: 0;
}

.search-btn {
    margin-top: 16px;
    width: 100%;
    border-radius: 16px;
    font-size: 16px;
    padding: 16px;
}

/* FAQ Accordion */
.faq-accordion-container {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.accordion-item {
    background: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--card-border);
    overflow: hidden;
    transition: var(--transition-smooth);
}

.accordion-item:hover {
    border-color: var(--card-border-hover);
}

.accordion-header {
    width: 100%;
    background: transparent;
    border: none;
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
    color: var(--text-primary);
    font-family: 'Prompt', sans-serif;
    font-size: 16px;
    font-weight: 600;
    gap: 20px;
    transition: var(--transition-smooth);
}

.accordion-icon {
    font-size: 24px;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.accordion-item.active .accordion-icon {
    color: var(--color-primary);
    transform: rotate(45deg);
}

.accordion-content {
    display: none;
    padding: 0 32px 32px 32px;
}

.accordion-item.active .accordion-content {
    display: block;
    animation: fadeUp 0.4s ease forwards;
}

.accordion-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Footer Section */
.app-footer {
    background: #09090b;
    border-top: 1px solid var(--card-border);
    padding: 80px 24px 40px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 500px;
}

.footer-brand p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
}

/* Result Container check.html */
.result-card {
    background: var(--card-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow-premium);
    transition: var(--transition-smooth);
}

/* Responsive CSS */
@media (max-width: 992px) {
    .step-content {
        padding: 32px;
        gap: 24px;
    }
    .step h2 { font-size: 28px; }
}

@media (max-width: 768px) {
    .btn-text-desktop, .badge-text-desktop { display: none; }
    .btn-text-mobile, .badge-text-mobile { display: inline; }
    .hero-section h1 { font-size: 42px; }
    .choice-container { flex-direction: column; align-items: center; }
    .footer-container { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 576px) {
    .header-container { padding: 12px 16px; }
    .header-badge { padding: 6px 10px; font-size: 12px; }
    .steps-nav-wrapper { top: 58px; }
    .hero-section { padding-top: 100px; }
    .hero-section h1 { font-size: 32px; }
    .hero-subtitle { font-size: 15px; }
    .nav-links { display: none; }
    .step h2 { font-size: 24px; }
    .step-content { padding: 24px; gap: 24px; border-radius: 20px; }
    .btn-secondary { margin-left: 0; margin-top: 12px; }
    
    .stepper-scroll-container {
        padding: 6px;
        border-radius: 12px;
    }
    .step-pill {
        padding: 8px 12px;
        font-size: 13px;
        border-radius: 8px;
    }
    
    .check-item-detail { padding: 16px; gap: 12px; flex-direction: column; }
    .badge-point { align-self: flex-start; }
}