/* ==========================================
   1. PALET WARNA & GLASSMORPHISM TACTICAL
   ========================================== */
:root {
    --primary-navy: #030b1e;
    --ocean-dark: #0a192f;
    --secondary-blue: #0284c7;
    --accent-cyan: #38bdf8;
    --accent-cyan-glow: rgba(56, 189, 248, 0.35);
    --light-cyan: #caf0f8;
    
    --glass-bg: rgba(10, 25, 47, 0.85);
    --glass-card: rgba(15, 23, 42, 0.75);
    --card-border: rgba(56, 189, 248, 0.18);
    --glass-blur: blur(16px);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --white: #ffffff;
    
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.25);
    --warning: #f43f5e;
    --warning-glow: rgba(244, 63, 94, 0.25);
    --welding-gold: #ffd166;
    
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    --transition-fast: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: 
        radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 10% 40%, rgba(2, 132, 199, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(244, 63, 94, 0.1) 0%, transparent 50%),
        linear-gradient(180deg, #020813 0%, #06152d 30%, #030d1a 70%, #01040a 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body.logged-out {
    overflow: hidden !important;
}

body.logged-out #mainApp {
    display: none !important;
}

body.logged-in #mainApp {
    display: block;
}

body::before {
    content: "";
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: repeating-linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.02) 0px,
        rgba(255, 255, 255, 0.02) 20px,
        transparent 20px,
        transparent 80px
    );
    pointer-events: none;
    z-index: 0;
}

/* ==========================================
   2. OVERLAY SISTEM LOGIN
   ========================================== */
.login-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background:
        linear-gradient(180deg, rgba(2, 8, 19, 0.88) 0%, rgba(2, 8, 19, 0.94) 100%),
        url('https://commons.wikimedia.org/wiki/Special:FilePath/US_Navy_010703-N-5329L-005_Diver_working_on_USS_Monitor_salvage.jpg?width=1600') center / cover no-repeat,
        rgba(2, 8, 19, 0.96);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    z-index: 99999;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
}

.login-card {
    background: rgba(10, 25, 47, 0.95);
    border: 1px solid var(--accent-cyan);
    box-shadow: 0 0 35px var(--accent-cyan-glow);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem 2rem;
    max-width: 420px;
    width: 100%;
    text-align: center;
    color: var(--white);
    animation: modalFadeIn 0.4s ease-out;
}

.login-card h2 {
    color: var(--accent-cyan);
    border-bottom: 2px solid var(--accent-cyan);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.login-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.login-error {
    color: var(--warning);
    font-size: 0.9rem;
    margin-top: 1rem;
    display: none;
    font-weight: bold;
    background: var(--warning-glow);
    padding: 10px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--warning);
}

.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-toggle-btn {
    position: absolute;
    right: 12px;
    cursor: pointer;
    user-select: none;
    font-size: 1.2rem;
    color: var(--accent-cyan);
    transition: opacity 0.2s;
}

.password-toggle-btn:hover {
    opacity: 0.8;
}

/* ==========================================
   3. HEADER & CONTAINER UTAMA
   ========================================== */
header {
    background:
        linear-gradient(180deg, rgba(2, 8, 19, 0.55) 0%, rgba(3, 11, 30, 0.82) 65%, rgba(3, 11, 30, 0.96) 100%),
        url('https://commons.wikimedia.org/wiki/Special:FilePath/US_Navy_011105-N-3093M-011_Navy_deep_sea_diver.jpg?width=1600') center 30% / cover no-repeat,
        var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--card-border);
    color: var(--white);
    padding: 4rem 1rem 2.6rem 1rem;
    text-align: center;
    position: relative;
    z-index: 10;
}

header::after {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        180deg,
        rgba(56, 189, 248, 0.05) 0px,
        rgba(56, 189, 248, 0.05) 2px,
        transparent 2px,
        transparent 5px
    );
    pointer-events: none;
    mix-blend-mode: screen;
}

header h1, header p {
    position: relative;
    z-index: 1;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
    color: #ffffff;
    text-shadow: 0 0 15px var(--accent-cyan-glow);
}

header p {
    font-size: 1rem;
    color: var(--light-cyan);
    max-width: 900px;
    margin: 0 auto;
}

.container {
    max-width: 1240px;
    margin: 1.5rem auto;
    padding: 0 1rem;
    position: relative;
    z-index: 5;
}

/* ==========================================
   4. GALERI INFOGRAFIK PERALATAN
   ========================================== */
.visual-gallery {
    background: #0f172a;
    color: #f8fafc;
    padding: 24px;
    border-radius: var(--border-radius-lg);
    margin-bottom: 1.8rem;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--card-border);
}

.visual-gallery h3 {
    text-align: center;
    color: var(--accent-cyan);
    margin-bottom: 24px;
    font-size: 1.35rem;
    letter-spacing: 0.5px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 16px;
}

.gallery-card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: var(--border-radius-md);
    padding: 18px 12px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.gallery-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-cyan);
    background: #334155;
    box-shadow: 0 10px 25px -5px var(--accent-cyan-glow);
}

.gallery-card svg {
    width: 44px;
    height: 44px;
    fill: var(--accent-cyan);
    margin-bottom: 10px;
}

.gallery-card span {
    display: block;
    font-weight: 600;
    font-size: 0.88rem;
    color: #e2e8f0;
}

/* ==========================================
   5. MODAL POPUP DETAIL
   ========================================== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

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

.modal-content {
    background: #1e293b;
    border: 1px solid #475569;
    border-radius: var(--border-radius-lg);
    max-width: 720px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.85);
    animation: modalFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: scale(0.96) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.close-btn {
    position: absolute;
    top: 12px; right: 16px;
    font-size: 26px;
    color: #cbd5e1;
    cursor: pointer;
    z-index: 10;
    line-height: 1;
    background: rgba(15, 23, 42, 0.7);
    width: 38px; height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-fast);
}

.close-btn:hover {
    color: #fff;
    background: var(--warning);
    border-color: transparent;
}

.modal-img-wrapper {
    width: 100%;
    height: 320px;
    background: radial-gradient(circle, #1e293b 0%, #090d16 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    border-bottom: 1px solid #334155;
}

.modal-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 8px 20px rgba(0,0,0,0.5);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
}

.modal-title {
    color: var(--accent-cyan);
    margin: 0 0 12px 0;
    font-size: 1.35rem;
    font-weight: 700;
}

.modal-desc {
    color: #cbd5e1;
    font-size: 0.92rem;
    line-height: 1.65;
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    background: #0f172a;
    padding: 14px;
    border-radius: var(--border-radius-md);
    border: 1px solid #334155;
    margin-top: 14px;
}

.spec-item {
    font-size: 0.85rem;
}

.spec-item strong {
    color: var(--accent-cyan);
    display: block;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

/* ==========================================
   6. TAB NAVIGATION
   ========================================== */
.tab-navigation {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 1.8rem;
}

.tab-btn {
    background: rgba(10, 25, 47, 0.85);
    border: 1px solid var(--accent-cyan);
    color: var(--light-cyan);
    padding: 10px 16px;
    font-weight: 600;
    font-size: 0.88rem;
    border-radius: 20px;
    cursor: pointer;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: var(--transition-fast);
}

.tab-btn:hover, .tab-btn.active {
    background: var(--accent-cyan);
    color: var(--primary-navy);
    box-shadow: 0 0 15px var(--accent-cyan-glow);
    font-weight: bold;
}

.tab-btn.calc-btn {
    border-color: var(--welding-gold);
    color: var(--welding-gold);
}

.tab-btn.calc-btn:hover, .tab-btn.calc-btn.active {
    background: var(--welding-gold);
    color: var(--primary-navy);
    box-shadow: 0 0 15px rgba(255, 209, 102, 0.5);
}

.tab-content {
    display: none;
    background: var(--glass-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    padding: 2.2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--card-border);
    animation: fadeIn 0.35s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    color: var(--text-primary);
    border-bottom: 3px solid var(--secondary-blue);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

/* ==========================================
   7. CARDS & GRID LAYOUT
   ========================================== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: rgba(30, 41, 59, 0.6);
    border-left: 5px solid var(--secondary-blue);
    padding: 1.25rem;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.card.warning {
    border-left-color: var(--warning);
    background-color: rgba(136, 19, 55, 0.2);
}

.card h3 {
    color: var(--accent-cyan);
    margin-bottom: 0.6rem;
}

.card.warning h3 {
    color: var(--warning);
}

ul, ol { margin-left: 1.2rem; }
li { margin-bottom: 0.5rem; color: #cbd5e1; }
li strong { color: #ffffff; }

/* ==========================================
   8. INPUT FORM & KALKULATOR
   ========================================== */
.calc-box {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid var(--card-border);
    padding: 1.8rem;
    border-radius: var(--border-radius-lg);
    margin-bottom: 1.5rem;
}

.form-group { margin-bottom: 1.2rem; }

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--accent-cyan);
    font-size: 0.88rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    background: rgba(30, 41, 59, 0.7);
    color: #ffffff;
    outline: none;
    transition: var(--transition-fast);
}

.form-control:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px var(--accent-cyan-glow);
    background: rgba(30, 41, 59, 0.95);
}

.btn-calc {
    background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    color: var(--white);
    border: 1px solid rgba(56, 189, 248, 0.4);
    padding: 14px 24px;
    font-weight: bold;
    font-size: 1rem;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    width: 100%;
    transition: var(--transition-fast);
    box-shadow: 0 4px 15px rgba(2, 132, 199, 0.3);
}

.btn-calc:hover {
    background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
    box-shadow: 0 6px 20px var(--accent-cyan-glow);
    transform: translateY(-2px);
}

/* ==========================================
   9. RESULT BOX & TABEL DEKOMPRESI
   ========================================== */
.result-box {
    display: none;
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    text-align: left;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    animation: slideUp 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-box.safe {
    background-color: rgba(6, 78, 59, 0.4);
    border: 1px solid var(--success);
    color: #a7f3d0;
    box-shadow: 0 0 25px var(--success-glow);
}

.result-box.danger {
    background-color: rgba(136, 19, 55, 0.4);
    border: 1px solid var(--warning);
    color: #fecdd3;
    box-shadow: 0 0 25px var(--warning-glow);
}

.result-box.info {
    background-color: rgba(12, 74, 110, 0.4);
    border: 1px solid var(--accent-cyan);
    color: #bae6fd;
    box-shadow: 0 0 25px var(--accent-cyan-glow);
}

.result-box h3 {
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.decom-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 1rem;
    background: rgba(15, 23, 42, 0.6);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--card-border);
}

.decom-table th, .decom-table td {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 12px 14px;
    text-align: center;
}

.decom-table th {
    background: #0f172a;
    color: var(--accent-cyan);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   10. CHECKLIST & TIMER
   ========================================== */
.checklist-item {
    display: flex;
    align-items: center;
    background: rgba(30, 41, 59, 0.6);
    padding: 14px 16px;
    margin-bottom: 10px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-fast);
}

.checklist-item:hover {
    background: rgba(51, 65, 85, 0.8);
    border-color: var(--accent-cyan);
}

.checklist-item input {
    margin-right: 14px;
    transform: scale(1.3);
    accent-color: var(--accent-cyan);
}

.progress-bar-container {
    width: 100%;
    background-color: #334155;
    border-radius: 20px;
    height: 18px;
    margin: 1.2rem 0;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--success);
    transition: width 0.3s ease;
}

.timer-box {
    text-align: center;
    background: #0f172a;
    border: 1px solid var(--card-border);
    color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    margin-top: 1rem;
}

.timer-display {
    font-size: 3.5rem;
    font-weight: bold;
    font-family: 'Courier New', Courier, monospace;
    color: var(--accent-cyan);
    margin: 0.8rem 0;
    text-shadow: 0 0 20px var(--accent-cyan-glow);
}

.btn-action {
    background-color: var(--accent-cyan);
    color: var(--primary-navy);
    border: none;
    padding: 10px 22px;
    font-weight: bold;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    margin: 5px;
    transition: var(--transition-fast);
}

.btn-action:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* ==========================================
   11. OCEAN DIVIDER — JEDA VISUAL BAWAH LAUT
   ========================================== */
.ocean-divider {
    position: relative;
    margin: 2.5rem 0;
    padding: 3.5rem 1.5rem;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    text-align: center;
    background:
        linear-gradient(90deg, rgba(2, 8, 19, 0.88) 0%, rgba(2, 8, 19, 0.45) 45%, rgba(2, 8, 19, 0.45) 55%, rgba(2, 8, 19, 0.88) 100%),
        url('https://commons.wikimedia.org/wiki/Special:FilePath/US_Navy_020723-N-7479T-002_Navy_diver_conducts_deep_sea_salvage_operations.jpg?width=1600') center 40% / cover no-repeat,
        #0a192f;
    border: 1px solid var(--card-border);
    box-shadow: var(--box-shadow);
}

.ocean-divider-content {
    position: relative;
    z-index: 1;
    max-width: 620px;
    margin: 0 auto;
}

.ocean-divider h3 {
    color: var(--white);
    font-size: 1.4rem;
    margin-bottom: 0.6rem;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}

.ocean-divider p {
    color: var(--light-cyan);
    font-size: 0.95rem;
    line-height: 1.6;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
    .ocean-divider { padding: 2.5rem 1.25rem; }
    .ocean-divider h3 { font-size: 1.15rem; }
}

/* ==========================================
   12. FORM ADUAN & FOOTER
   ========================================== */
.feedback-section {
    background: #0f172a;
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin-top: 3rem;
    box-shadow: var(--box-shadow);
}

.feedback-title {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.feedback-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
}

.feedback-input {
    width: 100%;
    background-color: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: var(--border-radius-md);
    padding: 14px 16px;
    color: #ffffff;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
}

.feedback-input:focus {
    border-color: var(--success);
    box-shadow: 0 0 0 3px var(--success-glow);
    background-color: rgba(30, 41, 59, 0.95);
}

.feedback-select {
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2338bdf8' viewBox='0 0 16 16'><path d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
    cursor: pointer;
}

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

footer {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--card-border);
    color: var(--light-cyan);
    margin-top: 4rem;
    font-size: 0.9rem;
    position: relative;
    z-index: 10;
}

@media (max-width: 768px) {
    header h1 { font-size: 1.5rem; }
    .tab-btn { width: 100%; text-align: center; border-radius: var(--border-radius-md); }
    .timer-display { font-size: 2.5rem; }
    .feedback-grid { grid-template-columns: 1fr; }
    .calc-box { padding: 1.25rem; }
    .decom-table th, .decom-table td { padding: 8px 10px; font-size: 0.78rem; }
}