:root {
    /* DSC Brand Colors */
    --dsc-navy: #1A2530;
    --dsc-navy-light: #2A3B4D;
    --dsc-navy-dark: #111827; /* MCK dark vibe */
    --dsc-gold: #ECA823;
    
    /* MCK Brand Colors */
    --mck-yellow: #FACC15;
    --mck-yellow-hover: #EAB308;
    
    /* Theme Variables */
    --bg-color: #0B111A; /* Very dark navy/black */
    --surface: #1A2530; /* Premium dark navy surface */
    --text-main: #FFFFFF;
    --text-muted: #B0B8C4; /* Improved contrast for readability */
    --border: #374151;
    
    /* Accent per section */
    --s1-color: #FACC15; --s1-bg: rgba(250, 204, 21, 0.1);
    --s2-color: #ECA823; --s2-bg: rgba(236, 168, 35, 0.1);
    --sb-color: #3B82F6; --sb-bg: rgba(59, 130, 246, 0.1);
    --s3-color: #10B981; --s3-bg: rgba(16, 185, 129, 0.1);
    --s4-color: #F59E0B; --s4-bg: rgba(245, 158, 11, 0.1);
    --s5-color: #EC4899; --s5-bg: rgba(236, 72, 153, 0.1);
    --sg-color: #8B5CF6; --sg-bg: rgba(139, 92, 246, 0.1);
    
    --radius: 16px;
    --shadow: 0 10px 40px rgba(0,0,0,0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dynamic Accent Assignment per Section */
.section-s1 { --accent-color: var(--s1-color); --accent-bg: var(--s1-bg); }
.section-s2 { --accent-color: var(--s2-color); --accent-bg: var(--s2-bg); }
.section-sb { --accent-color: var(--sb-color); --accent-bg: var(--sb-bg); }
.section-s3 { --accent-color: var(--s3-color); --accent-bg: var(--s3-bg); }
.section-s4 { --accent-color: var(--s4-color); --accent-bg: var(--s4-bg); }
.section-s5 { --accent-color: var(--s5-color); --accent-bg: var(--s5-bg); }
.section-sg { --accent-color: var(--sg-color); --accent-bg: var(--sg-bg); }

* { box-sizing: border-box; }

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    background-image: radial-gradient(circle at top right, rgba(250, 204, 21, 0.05), transparent 500px),
                      radial-gradient(circle at bottom left, rgba(236, 168, 35, 0.05), transparent 500px);
    background-attachment: fixed;
}

.container {
    max-width: 760px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 50px;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--dsc-navy-dark), var(--dsc-navy));
    border-radius: var(--radius);
    color: white;
    box-shadow: var(--shadow);
    border-bottom: 4px solid var(--mck-yellow);
}

.header-logo {
    width: 85%;
    max-width: 320px; /* Diperbesar agar tampak jelas dan premium */
    height: auto;
    margin-bottom: 20px;
    display: inline-block;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.35));
}

.header h1 {
    font-size: 2.5rem;
    margin: 0 0 10px 0;
    font-weight: 700;
    color: var(--mck-yellow);
}

.header p {
    margin: 0;
    opacity: 0.9;
    font-size: 1.1rem;
    color: #E2E8F0;
}

.form-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 40px 45px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    border-top: 6px solid var(--accent-color, var(--s1-color));
    transition: var(--transition);
    animation: fadeSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-section.hidden,
.form-section.hidden-branch {
    display: none !important;
    opacity: 0;
    transform: translateY(15px);
}

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-s1 { border-top-color: var(--s1-color); }
.section-s2 { border-top-color: var(--s2-color); }
.section-sb { border-top-color: var(--sb-color); }
.section-s3 { border-top-color: var(--s3-color); }
.section-s4 { border-top-color: var(--s4-color); }
.section-s5 { border-top-color: var(--s5-color); }
.section-sg { border-top-color: var(--sg-color); }

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.section-s1 .section-title { color: var(--s1-color); }
.section-s2 .section-title { color: var(--s2-color); }
.section-sb .section-title { color: var(--sb-color); }
.section-s3 .section-title { color: var(--s3-color); }
.section-s4 .section-title { color: var(--s4-color); }
.section-s5 .section-title { color: var(--s5-color); }
.section-sg .section-title { color: var(--sg-color); }

.question {
    margin-bottom: 35px;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.q-label {
    display: flex;
    align-items: flex-start;
    font-weight: 500;
    font-size: clamp(1.02rem, 2.5vw, 1.1rem);
    margin-bottom: 12px;
    color: var(--text-main);
}

.q-num {
    display: none; /* Disembunyikan agar tampilan lebih profesional untuk user */
    background: rgba(255,255,255,0.05);
    color: var(--text-main);
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 700;
    margin-right: 12px;
    margin-top: 2px;
    flex-shrink: 0;
}

.section-s1 .q-num { background: var(--s1-bg); color: var(--s1-color); }
.section-s2 .q-num { background: var(--s2-bg); color: var(--s2-color); }
.section-sb .q-num { background: var(--sb-bg); color: var(--sb-color); }
.section-s3 .q-num { background: var(--s3-bg); color: var(--s3-color); }
.section-s4 .q-num { background: var(--s4-bg); color: var(--s4-color); }
.section-s5 .q-num { background: var(--s5-bg); color: var(--s5-color); }
.section-sg .q-num { background: var(--sg-bg); color: var(--sg-color); }

.req { color: #EF4444; margin-left: 5px; font-weight: bold; }
.q-hint { display: block; font-size: clamp(0.82rem, 2vw, 0.9rem); color: var(--text-muted); margin-top: 5px; font-weight: 400; line-height: 1.4; }
.q-text { display: block; flex: 1; }

input[type="text"], input[type="tel"], input[type="email"], input[type="number"], input[type="date"], input[type="file"], input[type="url"], select, textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-main);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-color, var(--mck-yellow));
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.02), 0 0 0 4px var(--accent-bg, rgba(250, 204, 21, 0.15));
}

/* Override autofill colors in dark mode */
input:-webkit-autofill,
input:-webkit-autofill:hover, 
input:-webkit-autofill:focus, 
input:-webkit-autofill:active{
    -webkit-box-shadow: 0 0 0 30px var(--surface) inset !important;
    -webkit-text-fill-color: var(--text-main) !important;
    transition: background-color 5000s ease-in-out 0s;
}

textarea { resize: vertical; min-height: 120px; }

/* Select styling for dark mode dropdowns */
select option {
    background-color: var(--dsc-navy);
    color: var(--text-main);
}

.options-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
}

.options-inline {
    flex-direction: row;
    flex-wrap: wrap;
}

.opt-label {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.02);
    font-size: 0.95rem;
    flex: 1 1 auto;
    position: relative;
    user-select: none;
}

.opt-label:hover {
    border-color: var(--accent-color, var(--text-muted));
    background: rgba(255, 255, 255, 0.06);
}

.opt-label:has(input:checked),
.opt-label.checked {
    border-color: var(--accent-color, var(--mck-yellow));
    background: var(--accent-bg, rgba(250, 204, 21, 0.08));
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.opt-label input {
    margin-right: 12px;
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-color, var(--mck-yellow));
}

.cat-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 20px 0 10px 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Image Preview Styling - Responsif */
.file-preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 12px;
    margin-top: 15px;
    animation: fadeIn 0.3s ease;
}
.file-preview-item {
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.file-preview-item img {
    width: 100%;
    height: 70px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 6px;
}
.file-preview-details {
    display: flex;
    flex-direction: column;
    width: 100%;
    font-size: 0.7rem;
    line-height: 1.2;
}
.file-preview-name {
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}
.file-preview-size {
    color: var(--text-muted);
    margin-top: 2px;
}
.file-icon-placeholder {
    font-size: 2rem;
    margin-bottom: 6px;
}

/* Submit Pendaftaran Button Container */
.submit-container {
    margin-top: 35px;
    width: 100%;
}

.btn-submit {
    background: var(--mck-yellow);
    color: #000000;
    border: none;
    padding: 16px 36px;
    font-size: 1.2rem;
    font-weight: 700;
    font-family: inherit;
    border-radius: 12px;
    cursor: pointer;
    width: 100%;
    transition: var(--transition);
    box-shadow: 0 6px 20px rgba(250, 204, 21, 0.2);
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-submit:hover {
    background: var(--mck-yellow-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(250, 204, 21, 0.35);
}

.sdg-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media(min-width: 768px) {
    .sdg-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media(max-width: 600px) {
    body {
        padding: 10px;
        padding-top: calc(65px + env(safe-area-inset-top, 0px)) !important;
    }
    .form-section {
        padding: 24px 16px;
        margin-bottom: 20px;
    }
    .header {
        padding: 20px 12px;
        margin-bottom: 20px;
    }
    .header-logo {
        width: 65%;
        margin-bottom: 12px;
    }
    .header h1 {
        font-size: 1.6rem;
    }
    .header p {
        font-size: 0.88rem;
    }
    .q-label {
        font-size: 1rem;
    }
    .opt-label {
        padding: 14px 16px;
        font-size: 0.95rem;
        width: 100%;
        margin-right: 0;
        min-height: 48px;
        display: flex;
        align-items: center;
    }
    .opt-label input[type="radio"],
    .opt-label input[type="checkbox"] {
        width: 22px;
        height: 22px;
        margin-right: 12px;
        flex-shrink: 0;
    }
    .options-inline {
        flex-direction: column;
        gap: 8px;
    }
    .sdg-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    .sdg-grid .opt-label {
        font-size: 0.78rem;
        padding: 10px 8px;
        line-height: 1.35;
        min-height: 58px;
    }
    .sdg-grid .opt-label input[type="checkbox"] {
        width: 16px;
        height: 16px;
        margin-right: 6px;
    }
    input[type="text"], input[type="tel"], input[type="email"], input[type="number"], input[type="date"], input[type="file"], input[type="url"], select, textarea {
        font-size: 16px !important; /* Mencegah auto-zoom iOS */
        padding: 12px 14px;
        min-height: 48px;
    }
    textarea {
        min-height: 80px;
    }
    .btn-submit {
        font-size: 1.1rem;
        padding: 14px 28px;
        min-height: 48px;
    }
    /* Modal sheet slide-up untuk mobile */
    .custom-modal-overlay {
        align-items: flex-end;
    }
    .custom-modal-box {
        width: 100%;
        max-width: 100%;
        border-radius: 20px 20px 0 0;
        border-bottom: none;
        border-left: none;
        border-right: none;
        padding: 30px 20px calc(30px + env(safe-area-inset-bottom, 0px)) 20px;
        transform: translateY(100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-modal-overlay.active .custom-modal-box {
        transform: translateY(0);
    }
    .custom-modal-buttons {
        flex-direction: column;
        gap: 12px;
    }
    .custom-modal-btn {
        width: 100%;
        min-height: 48px;
    }
}

/* Premium Loading Overlay */
.submit-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(11, 17, 26, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.submit-loading-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.submit-loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(250, 204, 21, 0.1);
    border-top: 4px solid var(--mck-yellow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
    box-shadow: 0 0 15px rgba(250, 204, 21, 0.2);
}
.submit-loading-text {
    color: var(--text-main);
    font-size: 1.2rem;
    font-weight: 500;
    text-align: center;
    letter-spacing: 0.5px;
    padding: 0 20px;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Custom Dropdown / Select Component Premium */
.custom-select-wrapper {
    position: relative;
    width: 100%;
    user-select: none;
}

.custom-select-trigger {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-main);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.custom-select-trigger:hover {
    border-color: var(--accent-color, var(--mck-yellow));
    background: rgba(255, 255, 255, 0.06);
}

.custom-select-wrapper.open .custom-select-trigger {
    border-color: var(--accent-color, var(--mck-yellow));
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px var(--accent-bg, rgba(250, 204, 21, 0.15));
}

.custom-select-arrow {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.custom-select-wrapper.open .custom-select-arrow {
    transform: rotate(180deg);
    color: var(--accent-color, var(--mck-yellow));
}

.custom-select-options-container {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--dsc-navy-light); /* Lebih terang sedikit dari surface agar melayang kontras */
    border: 1.5px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    z-index: 100;
    max-height: 320px;
    overflow-y: auto;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.custom-select-wrapper.open .custom-select-options-container {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* Custom Scrollbar */
.custom-select-options-container::-webkit-scrollbar {
    width: 6px;
}
.custom-select-options-container::-webkit-scrollbar-track {
    background: transparent;
}
.custom-select-options-container::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}
.custom-select-options-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.custom-select-group-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--mck-yellow); /* Berwarna kuning emas agar kontras dan sangat jelas */
    padding: 12px 18px 6px 18px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: rgba(0, 0, 0, 0.2); /* Pembeda background tipis untuk grup */
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.custom-select-option {
    padding: 11px 22px;
    font-size: 0.95rem;
    color: #E2E8F0;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.custom-select-option:hover {
    background: rgba(250, 204, 21, 0.08); /* Glow kuning tipis saat dihover */
    color: var(--text-main);
    padding-left: 26px; /* Geser sedikit agar dinamis */
}

.custom-select-option.selected {
    background: var(--accent-bg, rgba(250, 204, 21, 0.12));
    color: var(--accent-color, var(--mck-yellow));
    font-weight: 600;
}

.custom-select-option.selected::after {
    content: "✓";
    font-weight: 700;
    color: var(--accent-color, var(--mck-yellow));
    font-size: 0.9rem;
}

/* Progress Bar Premium */
.progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 8px; /* Increased for mobile visibility */
    background: rgba(255, 255, 255, 0.05);
    z-index: 10000;
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--mck-yellow), var(--dsc-gold));
    box-shadow: 0 0 10px rgba(250, 204, 21, 0.5);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Custom Premium Modal Dialog */
.custom-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 17, 26, 0.85);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10001;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.custom-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.custom-modal-box {
    background: var(--surface);
    border: 2px solid var(--dsc-gold);
    border-radius: var(--radius);
    padding: 35px 30px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 15px rgba(236, 168, 35, 0.1);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
}

.custom-modal-overlay.active .custom-modal-box {
    transform: scale(1);
}

.custom-modal-icon {
    font-size: 3.5rem;
    margin-bottom: 15px;
    animation: bounceIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.custom-modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--text-main);
}

.custom-modal-title.success { color: #10B981; }
.custom-modal-title.error { color: #EF4444; }
.custom-modal-title.confirm { color: var(--dsc-gold); }

.custom-modal-body {
    font-size: 0.98rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    line-height: 1.6;
}

.custom-modal-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.custom-modal-btn {
    padding: 12px 24px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    min-width: 120px;
    border: none;
}

.custom-modal-btn-cancel {
    background: transparent;
    color: var(--text-muted);
    border: 1.5px solid var(--border);
}

.custom-modal-btn-cancel:hover {
    background: rgba(255,255,255,0.05);
    color: var(--text-main);
    border-color: var(--text-muted);
}

.custom-modal-btn-confirm {
    background: var(--mck-yellow);
    color: #000000;
}

.custom-modal-btn-confirm:hover {
    background: var(--mck-yellow-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(250, 204, 21, 0.3);
}

@keyframes bounceIn {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.05); }
    70% { transform: scale(0.9); }
    100% { transform: scale(1); opacity: 1; }
}

/* Main Footer Premium Style */
.main-footer {
    background: linear-gradient(135deg, var(--dsc-navy-dark), var(--dsc-navy));
    color: var(--text-muted);
    margin-top: 50px;
    border-radius: var(--radius);
    padding: 35px 40px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--mck-yellow); /* Aksen garis kuning tipis di bagian atas */
}

.footer-headline {
    font-size: 1rem;
    line-height: 1.6;
    margin: 0 0 25px 0;
    border-bottom: 1px solid var(--border);
    padding-bottom: 18px;
    text-align: center;
    color: var(--text-main);
}

.footer-headline strong {
    color: var(--mck-yellow);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
    margin-bottom: 25px;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.footer-info h4, .footer-address h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--mck-yellow);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-info ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-info ul li {
    margin-bottom: 8px;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.footer-info ul li strong {
    color: var(--text-main);
}

.footer-info ul li a {
    color: var(--mck-yellow);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dotted var(--mck-yellow);
    transition: var(--transition);
}

.footer-info ul li a:hover {
    color: var(--text-main);
    border-bottom-style: solid;
}

.footer-address p {
    margin: 0;
    line-height: 1.6;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.footer-copyright {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 500;
    border-top: 1px solid var(--border);
    padding-top: 15px;
    margin-top: 15px;
    color: var(--text-muted);
    opacity: 0.8;
}

/* Micro-interactions & Visual Enhancements */
.opt-label:active, .custom-select-trigger:active, .btn-submit:active {
    transform: scale(0.98);
}

/* Custom Upload Zone CSS */
.upload-zone {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 24px 16px;
    text-align: center;
    background: rgba(255, 255, 255, 0.02);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 120px;
}
.upload-zone:hover, .upload-zone:focus-within {
    border-color: var(--accent-color, var(--mck-yellow));
    background: var(--accent-bg, rgba(250, 204, 21, 0.05));
    box-shadow: 0 0 0 3px var(--accent-bg, rgba(250, 204, 21, 0.1));
}
.upload-zone input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 1;
}
.upload-icon {
    font-size: 2rem;
    line-height: 1;
}
.upload-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
}
.upload-subtext {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.upload-zone .file-preview-container {
    position: relative;
    z-index: 2;
    width: 100%;
    margin-top: 10px;
}

/* Floating Section Navigator (Universal) */
.section-nav-container {
    position: fixed;
    top: 8px; /* below progress bar */
    left: 0;
    width: 100%;
    background: rgba(11, 17, 26, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 9999;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    transition: transform 0.3s ease;
}
.section-nav-container::-webkit-scrollbar {
    display: none;
}
.section-nav-pill {
    white-space: nowrap;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}
.section-nav-pill.active {
    color: var(--accent-color, var(--mck-yellow));
    background: var(--accent-bg, rgba(250, 204, 21, 0.1));
    border-color: var(--accent-color, var(--mck-yellow));
}
.section-nav-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}
.progress-percent-badge {
    background: var(--accent-bg, rgba(250, 204, 21, 0.15));
    color: var(--accent-color, var(--mck-yellow));
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 20px;
    font-family: monospace;
    margin-left: auto;
    border: 1px solid var(--accent-color, var(--mck-yellow));
    flex-shrink: 0;
}

/* Scroll-to-Top FAB */
.scroll-to-top-btn {
    position: fixed;
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--mck-yellow);
    color: #000000;
    border: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    z-index: 999;
    opacity: 0;
    transform: translateY(15px);
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.scroll-to-top-btn.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.scroll-to-top-btn:hover {
    background: var(--mck-yellow-hover);
    transform: translateY(-2px);
}
.scroll-to-top-btn:active {
    transform: scale(0.9);
}

/* Base Body Padding Adjustment for Floating Top Navigator */
body {
    padding-top: calc(65px + env(safe-area-inset-top, 0px)) !important;
}

/* Accessibility settings */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-delay: 0s !important;
        animation-duration: 0s !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0s !important;
        scroll-behavior: auto !important;
    }
}

/* Master Portal Navigation Bar */
.portal-navigation {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 25px;
    background: linear-gradient(135deg, var(--dsc-navy-dark), var(--dsc-navy));
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.portal-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex: 1;
    padding: 12px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: var(--transition);
    min-height: 44px;
}
.portal-nav-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.03);
}
.portal-nav-btn.active {
    background: var(--mck-yellow);
    color: #000000;
    box-shadow: 0 4px 15px rgba(250, 204, 21, 0.2);
}
.portal-nav-btn.active .nav-icon {
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.2));
}

@media(max-width: 480px) {
    .portal-nav-btn {
        padding: 8px 10px;
        font-size: 0.8rem;
        gap: 4px;
    }
    .portal-navigation {
        gap: 8px;
        padding: 6px;
        margin-bottom: 15px;
    }
}