:root {
    --navy: #0f172a;
    --gold: #b8924e;
    --blue: #4f46e5;
    --bg: #f8fafc;
    --white: #ffffff;
    --gray: #64748b;
    --red: #ef4444;
    --green: #22c55e;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--navy); overflow-x: hidden; line-height: 1.5; }

/* NAVIGATION */
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 0 5%; background: white; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z-index: 100; height: 70px; }
.logo { font-size: 1.3rem; font-weight: 800; letter-spacing: -1px; } 
.logo span { color: var(--gold); }
.btn-back { text-decoration: none; color: var(--gray); font-weight: 700; font-size: 0.7rem; border: 1.5px solid #e2e8f0; padding: 8px 14px; border-radius: 10px; }

/* LAYOUT */
.container { padding: 1rem; display: flex; justify-content: center; min-height: calc(100vh - 70px); align-items: flex-start; }
.form-wrapper { background: white; width: 100%; max-width: 480px; padding: 1.5rem; border-radius: 24px; box-shadow: 0 10px 25px rgba(0,0,0,0.05); text-align: center; margin-top: 0.5rem; }

/* PROGRESS BAR */
.progress-container { display: flex; justify-content: space-between; position: relative; margin-bottom: 2rem; padding: 0 5px; }
.progress-bar-bg { position: absolute; top: 15px; left: 0; width: 100%; height: 2px; background: #f1f5f9; z-index: 1; }
.progress-line { width: 0%; height: 100%; background: var(--blue); transition: 0.5s ease; }
.circle { width: 32px; height: 32px; background: white; border: 2px solid #e2e8f0; border-radius: 50%; z-index: 2; font-size: 0.75rem; display: flex; align-items: center; justify-content: center; font-weight: 800; color: var(--gray); transition: 0.3s; }
.circle.active { border-color: var(--blue); color: var(--blue); transform: scale(1.1); background: #f8faff; }
.circle.completed { background: var(--blue); border-color: var(--blue); color: white; }

/* STEPS */
.step { display: none; }
.step.active { display: block; animation: mobileFadeUp 0.4s ease-out forwards; }
@keyframes mobileFadeUp { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }
.step h2 { font-size: 1.2rem; font-weight: 800; margin-bottom: 1.2rem; color: var(--navy); text-align: left; }

/* INPUTS */
.input-group { text-align: left; margin-bottom: 1rem; }
.input-group label { display: block; font-size: 0.65rem; font-weight: 800; color: var(--gray); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
.input-group input, .input-group select { 
    width: 100%; height: 55px; padding: 0 1rem; border: 2px solid #f1f5f9; border-radius: 14px; 
    font-size: 16px !important; font-weight: 600; outline: none; transition: 0.3s; background: #f8fafc;
}

/* BUTTONS GENERAL */
.btn-primary { 
    width: 100%; height: 60px; background: var(--navy); color: white; border: none; border-radius: 18px; 
    font-weight: 700; font-size: 1rem; cursor: pointer; transition: 0.2s; 
    display: flex; align-items: center; justify-content: center;
}

/* FINAL STEP BUTTONS (STACKED) */
.button-group-final {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 100%;
}

.btn-save {
    background: var(--green) !important;
    height: 65px;
    font-size: 1.1rem;
    box-shadow: 0 10px 20px rgba(34, 197, 94, 0.2);
}

.btn-flip {
    width: 100%;
    height: 55px;
    background: #f1f5f9;
    color: var(--navy);
    border: 2px solid #e2e8f0;
    border-radius: 18px;
    font-weight: 700;
    cursor: pointer;
}

/* CARD 3D SYSTEM */
.card-scene {
    width: 100%;
    aspect-ratio: 1.58 / 1;
    perspective: 1000px;
    margin-bottom: 20px;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
}

.card-inner.is-flipped { transform: rotateY(180deg); }

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 20px;
    padding: 1.5rem;
}

.card-front {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: white;
    text-align: left;
}

.card-back {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    transform: rotateY(180deg);
    padding: 0;
    display: flex;
    flex-direction: column;
}

.chip-card { width: 45px; height: 35px; background: linear-gradient(135deg, #f6d365 0%, #fda085 100%); border-radius: 6px; margin-top: 10px; }
.bank-name { font-size: 0.7rem; font-weight: 800; color: var(--gold); letter-spacing: 1.5px; }
.card-number { font-size: 1.3rem; letter-spacing: 2px; font-family: monospace; }
.mag-stripe { width: 100%; height: 40px; background: #000; margin-top: 20px; }
.cvv-area { margin: 20px 1.5rem; height: 35px; background: #eee; display: flex; justify-content: flex-end; align-items: center; padding-right: 10px; }
.cvv-code { font-weight: 700; color: #000; font-family: monospace; }
.card-terms { padding: 0 1.5rem; font-size: 7px; color: rgba(255,255,255,0.4); line-height: 1.2; }

/* UTILS */
.spinner-large { border: 4px solid #f1f5f9; border-top-color: var(--blue); border-radius: 50%; width: 45px; height: 45px; animation: spin 1s infinite linear; margin: 0 auto 1.2rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.reveal-text { opacity: 0; font-size: 0.75rem; font-weight: 700; margin-bottom: 6px; text-align: left; padding-left: 10px; border-left: 3px solid #e2e8f0; transition: 0.5s; }
.reveal-text.show { opacity: 1; border-left-color: var(--gold); }

/* EFEK GLOW SAAT KARTU TERBIT */
.final-glow {
    animation: cardGlow 2s infinite alternate;
}

@keyframes cardGlow {
    from { box-shadow: 0 0 20px rgba(79, 70, 229, 0.2); }
    to { box-shadow: 0 0 40px rgba(184, 146, 78, 0.6); }
}

/* PERBAIKAN SISTEM 3D */
.card-scene {
    width: 100%;
    max-width: 350px;
    aspect-ratio: 1.58 / 1;
    perspective: 1200px; /* Kedalaman 3D lebih dalam */
    margin: 20px auto;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transition: transform 0.9s cubic-bezier(0.34, 1.56, 0.64, 1); /* Efek membal (bouncy) */
    transform-style: preserve-3d;
    cursor: pointer;
}

.card-inner.is-flipped { 
    transform: rotateY(180deg) rotateZ(1deg); /* Sedikit miring agar artistik */
}

/* SISI BELAKANG KARTU (Sesuai Foto) */
.card-back {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    transform: rotateY(180deg);
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    border: 1px solid rgba(255,255,255,0.1);
}

.mag-stripe {
    width: 100%;
    height: 45px;
    background: #111;
    margin-top: 25px;
}

.cvv-area {
    margin: 20px 1.5rem 10px;
    height: 40px;
    background: #e2e8f0;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding-right: 15px;
    border-radius: 4px;
    position: relative;
}

.cvv-area::before {
    content: "CVV";
    position: absolute;
    left: -35px;
    bottom: 5px;
    font-size: 10px;
    color: white;
    font-weight: bold;
}

.cvv-code {
    color: #000;
    font-family: 'Courier New', monospace;
    font-weight: 900;
    font-style: italic;
    font-size: 1.2rem;
    letter-spacing: 2px;
}

.card-terms {
    padding: 0 1.5rem;
    font-size: 8px;
    color: rgba(255,255,255,0.6);
    line-height: 1.4;
    text-align: left;
    margin-top: 10px;
}

.back-logo-area {
    margin-top: auto;
    margin-bottom: 20px;
    padding: 0 1.5rem;
    display: flex;
    justify-content: flex-end;
}

.mini-logo {
    width: 20px;
    height: 20px;
    background: var(--gold);
    mask: url('https://cdn-icons-png.flaticon.com/512/217/217430.png') no-repeat center;
    -webkit-mask: url('https://cdn-icons-png.flaticon.com/512/217/217430.png') no-repeat center;
    mask-size: contain;
}