/* ========================================
   STYLE SIMULASI - LABORATORIUM VIRTUAL SD
   Author: Frissenda Septrianur Marinda Karno Putri - 220611100069
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Calibri', 'Arial', sans-serif;
    background-image: url('../asset/backgroundindex.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.background, .science-elements, .element {
    display: none;
}

/* HEADER */
.simulasi-header {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

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

.title h1 {
    color: #2c5530;
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8);
}

.title p {
    color: #2c5530;
    font-weight: 500;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.back-btn {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.9), rgba(46, 125, 50, 0.9));
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.back-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    background: linear-gradient(135deg, rgba(102, 187, 106, 0.95), rgba(56, 142, 60, 0.95));
}

.back-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* CONTAINER */
.simulasi-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.simulasi-card {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.simulasi-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.simulation-box {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* WELCOME */
.welcome-message {
    text-align: center;
    margin-bottom: 3rem;
}

.welcome-message h2 {
    color: #2c5530;
    font-size: 2rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8);
}

.welcome-message p {
    color: #2c5530;
    font-size: 1.1rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

/* GAYA GRID */
.gaya-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.gaya-card {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.9), rgba(46, 125, 50, 0.9));
    color: white;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    display: block;
}

.gaya-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, rgba(102, 187, 106, 0.95), rgba(56, 142, 60, 0.95));
}

.gaya-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    display: block;
}

.gaya-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.gaya-card p {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.gaya-assets {
    display: flex;
    justify-content: center;
    gap: 1rem;
    font-size: 2rem;
}

/* INFO PANEL */
.info-panel {
    background: rgba(76, 175, 80, 0.1);
    padding: 1.5rem;
    border-radius: 15px;
    border-left: 5px solid #4caf50;
    margin-bottom: 2rem;
}

.info-panel h3 {
    color: #2c5530;
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.info-panel p {
    color: #2c5530;
    margin: 0.5rem 0;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

/* SELECTION */
.surface-selection,
.object-selection {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.surface-option,
.object-option {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    position: relative;
    min-width: 200px;
}

.surface-option:hover,
.object-option:hover {
    background: rgba(255, 255, 255, 0.5);
    transform: translateY(-5px);
}

.surface-option.selected,
.object-option.selected {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.2);
}

.surface-option img,
.object-option img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 0.5rem;
}

.object-option img {
    width: 100px;
    height: 100px;
    object-fit: contain;
}

.surface-label,
.object-label {
    color: #2c5530;
    font-weight: bold;
    font-size: 1.1rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.selection-indicator {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #4caf50;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    display: none;
}

/* VEHICLE SELECTION (Motor/Mobil) */
.vehicle-selection {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.vehicle-option {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    position: relative;
    min-width: 150px;
}

.vehicle-option:hover {
    background: rgba(255, 255, 255, 0.5);
    transform: translateY(-5px);
}

.vehicle-option.selected {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.2);
}

.vehicle-img {
    width: 120px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 0.5rem;
}

.vehicle-label {
    color: #2c5530;
    font-weight: bold;
    font-size: 1rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

/* Update .mobil class untuk support motor */
.mobil {
    position: absolute;
    bottom: 30px;
    left: 50px;
    width: 120px;  /* Default untuk mobil */
    transition: left 0.5s ease;
    z-index: 20;
}

.mobil.motor {
    width: 100px;  /* Motor lebih kecil */
}

.mobil img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

/* Responsive untuk vehicle */
@media (max-width: 480px) {
    .vehicle-selection {
        flex-direction: column;
        align-items: center;
    }
    .vehicle-option {
        width: 100%;
        max-width: 250px;
    }
    .vehicle-img {
        width: 100px;
        height: 70px;
    }
    .mobil.motor {
        width: 90px;
    }
}

/* SIMULATION AREA */
.simulation-area {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    padding: 2rem;
    min-height: 400px;
    position: relative;
    border: 2px solid rgba(255, 255, 255, 0.4);
    overflow: visible;
    margin-bottom: 2rem;
}

/* GAYA GESEK */
.gesek-area {
    position: relative;
    overflow: hidden;
    min-height: 300px;
    --surface-bottom: 0px;
    --surface-height: 170px;
    --wheel-contact-offset: 12px;
}

.surface-background {
    width: 100%;
    height: var(--surface-height);
    position: absolute;
    bottom: var(--surface-bottom);
    left: 0;
    z-index: 10;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0;
}

.surface-bg-img {
    width: 100%;
    height: 100%;
    object-fit: fill;
    object-position: center;
    display: block;
}

.mobil {
    position: absolute;
    /* Ban kendaraan menyentuh permukaan atas aspal/tanah */
    bottom: calc(var(--surface-bottom) + var(--surface-height) - 102px);
    left: 50px;
    width: 120px;
    transition: left 0.5s ease;
    z-index: 20;
}

.mobil.motor {
    width: 100px;
    /* Motor sedikit lebih rendah agar roda terlihat menapak */
    bottom: calc(var(--surface-bottom) + var(--surface-height) - 98px);
}

/* Kalibrasi khusus tiap permukaan agar kendaraan tidak mengambang */
.gesek-area[data-surface="tanah"] .mobil {
    bottom: calc(var(--surface-bottom) + var(--surface-height) - 134px);
}

.gesek-area[data-surface="tanah"] .mobil.motor {
    bottom: calc(var(--surface-bottom) + var(--surface-height) - 145px);
}

.mobil img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 6px 8px rgba(0, 0, 0, 0.28));
}

.finish-line {
    position: absolute;
    right: 50px;
    bottom: calc(var(--surface-bottom) + var(--surface-height) - 12px);
    background: linear-gradient(135deg, #000, #333);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    font-weight: bold;
    font-size: 0.9rem;
    z-index: 15;
}

/* GAYA OTOT */
.otot-area {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 50px;
    min-height: 350px;
}

.push-container {
    display: flex;
    align-items: flex-end;
    transition: all 0.5s ease;
}

.manusia {
    width: 100px;
    margin-right: -20px;
}

.manusia img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

.manusia.walking {
    animation: walk 0.5s infinite alternate;
}

@keyframes walk {
    from { transform: rotate(-5deg); }
    to { transform: rotate(5deg); }
}

.meja {
    width: 150px;
}

.meja img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

.force-arrow {
    position: absolute;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: all 0.3s ease;
    text-align: center;
    z-index: 20;
}

.force-arrow span {
    display: block;
    background: rgba(76, 175, 80, 0.9);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: bold;
    margin-bottom: 0.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.force-arrow .arrow {
    font-size: 2rem;
    color: #4caf50;
}

/* GAYA MAGNET */
.magnet-area {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem;
    min-height: 350px;
    position: relative;
}

.magnet-fixed {
    text-align: center;
    flex-shrink: 0;
    position: relative;
    z-index: 10;
}

.magnet-fixed img {
    width: 150px;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

.magnet-label {
    color: #2c5530;
    font-weight: bold;
    margin-top: 0.5rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.test-object {
    text-align: center;
    flex-shrink: 0;
    transition: all 0.5s ease;
    position: relative;
    z-index: 10;
}

.test-object img {
    width: 100px;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

.attraction-line {
    position: absolute;
    top: 50%;
    left: 20%;
    right: 20%;
    height: 4px;
    background: linear-gradient(90deg, transparent, #4caf50, transparent);
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 5;
}

.line-dots {
    display: flex;
    justify-content: space-around;
    width: 100%;
}

.line-dots span {
    color: #4caf50;
    font-size: 1.5rem;
    animation: pulse 0.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* GAYA GRAVITASI */
.gravity-area {
    position: relative;
    min-height: 480px;
}

.tree-container {
    position: relative;
    width: 100%;
    height: 380px;
    margin-bottom: 1rem;
}

.tree-img {
    width: 380px;
    height: auto;
    display: block;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 5px 15px rgba(0, 0, 0, 0.3));
}

.fruit {
    position: absolute;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}

.fruit.on-tree {
    animation: sway 3s infinite ease-in-out;
}

@keyframes sway {
    0%, 100% { transform: rotate(-5deg); }
    50% { transform: rotate(5deg); }
}

.fruit-emoji {
    font-size: 3.5rem;
    display: block;
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.3));
    transition: all 0.3s ease;
}

.fruit:hover .fruit-emoji {
    transform: scale(1.2);
}

.fruit.falling {
    animation: fall 1.5s ease-in forwards;
}

.fruit.fallen {
    top: 350px !important;
    animation: none;
    cursor: default;
}

@keyframes fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(280px) rotate(360deg);
        opacity: 0.9;
    }
}

.ground {
    width: 100%;
    height: 80px;
    background: linear-gradient(to bottom, #8B7355, #654321);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 1rem;
    position: relative;
}

.ground-label {
    color: white;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    margin-bottom: 0.5rem;
}

.fallen-fruits {
    display: flex;
    gap: 0.5rem;
}

.fallen-fruit {
    font-size: 2rem;
    animation: bounce 0.5s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.gravity-arrow {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    text-align: center;
    z-index: 20;
}

.arrow-text {
    background: rgba(76, 175, 80, 0.9);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.arrow-line {
    font-size: 3rem;
    color: #4caf50;
    line-height: 1;
}

/* GAYA PEGAS */
.pegas-area {
    position: relative;
    padding: 2rem;
    min-height: 480px;
}

.trampolin-container {
    position: relative;
    margin: 0 auto;
    transition: all 0.3s ease;
    text-align: center;
}

.trampolin-container.pressed {
    transform: scaleY(0.7);
}

.trampolin-img {
    width: 350px;
    height: auto;
    filter: drop-shadow(0 5px 15px rgba(0, 0, 0, 0.3));
}

.trampolin-label {
    text-align: center;
    color: #2c5530;
    font-weight: bold;
    margin-top: 0.5rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.manusia-lompat {
    position: absolute;
    bottom: 180px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    transition: all 0.3s ease;
    z-index: 20;
}

.manusia-lompat img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.3));
}

.manusia-lompat.jumping {
    animation: jump 1s ease-out;
}

@keyframes jump {
    0%, 100% {
        bottom: 180px;
        transform: translateX(-50%) rotate(0deg);
    }
    50% {
        bottom: 380px;
        transform: translateX(-50%) rotate(10deg);
    }
}

.jump-counter {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(76, 175, 80, 0.9);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    font-weight: bold;
    font-size: 1.2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    z-index: 30;
}

#jumpCount {
    font-size: 1.5rem;
    color: #fff;
}

.force-indicator {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem;
    border-radius: 10px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 30;
}

.force-bar {
    width: 150px;
    height: 20px;
    background: linear-gradient(90deg, #4caf50, #8bc34a);
    border-radius: 10px;
    transition: width 0.3s ease;
    margin-bottom: 0.5rem;
}

#forceText {
    color: #2c5530;
    font-weight: bold;
    font-size: 0.9rem;
}

/* ========================================
   BACKGROUND MUSIC CONTROL
   ======================================== */
.music-control {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    z-index: 9999;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 0.8rem 1.2rem;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.music-control:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.music-btn {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.9), rgba(46, 125, 50, 0.9));
    color: white;
    border: none;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
}

.music-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    background: linear-gradient(135deg, rgba(102, 187, 106, 0.95), rgba(56, 142, 60, 0.95));
}

.volume-slider {
    width: 80px;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.9), rgba(46, 125, 50, 0.9));
    border-radius: 50%;
    cursor: pointer;
}

@media (max-width: 480px) {
    .music-control {
        bottom: 10px;
        right: 10px;
        padding: 0.6rem 1rem;
    }
    .music-btn {
        width: 40px;
        height: 40px;
    }
    .volume-slider {
        width: 60px;
    }
}
/* CONTROL PANEL */
.control-panel {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.action-btn {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.9), rgba(46, 125, 50, 0.9));
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.action-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    background: linear-gradient(135deg, rgba(102, 187, 106, 0.95), rgba(56, 142, 60, 0.95));
}

.action-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.action-btn.reset-btn {
    background: rgba(255, 255, 255, 0.3);
    color: #2c5530;
}

.action-btn.reset-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

/* RESULT PANEL */
.result-panel {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    padding: 1.5rem;
    margin-top: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.result-panel h3 {
    color: #2c5530;
    margin-bottom: 1rem;
    font-size: 1.3rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.result-text {
    color: #2c5530;
    line-height: 1.8;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.result-item {
    background: rgba(255, 255, 255, 0.5);
    padding: 1.5rem;
    border-radius: 10px;
    line-height: 1.8;
}

.result-item.success {
    background: rgba(76, 175, 80, 0.2);
    border-left: 4px solid #4caf50;
}

.result-item.fail {
    background: rgba(244, 67, 54, 0.2);
    border-left: 4px solid #f44336;
}

.highlight {
    background: rgba(76, 175, 80, 0.3);
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    font-weight: bold;
    color: #2c5530;
}

/* EXPLANATION PANEL */
.explanation-panel {
    background: rgba(76, 175, 80, 0.1);
    border-radius: 15px;
    padding: 2rem;
    border-left: 5px solid #4caf50;
}

.explanation-panel h3 {
    color: #2c5530;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.explanation-panel p {
    color: #2c5530;
    line-height: 1.8;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

/* FOOTER */
.simulasi-footer {
    background: rgba(255, 255, 255, 0.2);
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.simulasi-footer p {
    color: #2c5530;
    font-size: 0.9rem;
    font-weight: 500;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .simulation-area {
        min-height: 350px;
    }
    
    .tree-img,
    .trampolin-img {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .title h1 {
        font-size: 1.5rem;
    }

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

    .surface-selection,
    .object-selection {
        flex-direction: column;
        align-items: center;
    }

    .surface-option,
    .object-option {
        width: 100%;
        max-width: 300px;
    }

    .magnet-area {
        flex-direction: column;
        gap: 2rem;
    }

    .control-panel {
        flex-direction: column;
    }

    .action-btn {
        width: 100%;
    }

    .simulation-area {
        padding: 1rem;
        min-height: 300px;
    }

    .gravity-arrow {
        position: relative;
        right: auto;
        top: auto;
        transform: none;
        margin-top: 1rem;
    }

    .jump-counter,
    .force-indicator {
        position: relative;
        top: auto;
        left: auto;
        right: auto;
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    .title h1 {
        font-size: 1.3rem;
    }

    .title p {
        font-size: 0.9rem;
    }

    .gaya-icon {
        font-size: 3rem;
    }

    .gaya-card h3 {
        font-size: 1.2rem;
    }

    .gaya-card p {
        font-size: 0.85rem;
    }

    .surface-option img,
    .object-option img {
        width: 100px;
        height: 100px;
    }

    .mobil {
        width: 80px;
        bottom: 20px;
    }

    .manusia,
    .manusia-lompat {
        width: 70px;
    }

    .meja {
        width: 100px;
    }

    .fruit-emoji {
        font-size: 2.5rem;
    }

    .fallen-fruit {
        font-size: 1.5rem;
    }

    .back-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
}

/* UTILITY */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.fade-in {
    animation: fadeIn 0.5s ease;
}

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

.loading {
    opacity: 0.5;
    pointer-events: none;
}

@media print {
    .simulasi-header,
    .control-panel,
    .back-btn {
        display: none;
    }

    .simulation-box {
        box-shadow: none;
        border: 1px solid #000;
    }
}