:root{
    --bg-main: #08111f;
    --bg-soft: #0c1728;
    --text-main: #ffffff;
    --text-soft: #c6d2dd;
    --accent: #00d9ff;
    --surface: rgba(255,255,255,0.04);
    --line: rgba(255,255,255,0.08);
    --shadow: 0 18px 40px rgba(0,0,0,0.18);
}

html[data-theme="light"]{
    --bg-main: #eef3f9;
    --bg-soft: #ffffff;
    --text-main: #0d1724;
    --text-soft: #415164;
    --accent: #006b9f;
    --surface: rgba(255,255,255,0.88);
    --line: rgba(13,23,36,0.12);
    --shadow: 0 18px 40px rgba(13,23,36,0.08);
}

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body{
    min-height: 100vh;
    background: radial-gradient(circle at 0% 0%, rgba(0,217,255,0.12), transparent 30%), var(--bg-main);
    color: var(--text-main);
}

html{
    scroll-behavior: smooth;
}

/* CONTAINER */

.container{
    display: flex;
    min-height: 100vh;
}

/* LEFT PANEL */

.left-panel{
    flex: 1;
    position: relative;
    background:
    linear-gradient(
        135deg,
        rgba(0,217,255,0.12),
        #08111f
    );
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px;
    overflow: hidden;
}

html[data-theme="light"] .left-panel{
    background: linear-gradient(135deg, rgba(0,107,159,0.12), var(--bg-soft));
}

.overlay{
    position: absolute;
    width: 100%;
    height: 100%;
    background:
    radial-gradient(
        circle at top left,
        rgba(0,217,255,0.2),
        transparent 40%
    );
}

html[data-theme="light"] .overlay{
    background:
    radial-gradient(
        circle at top left,
        rgba(0,107,159,0.16),
        transparent 40%
    );
}

.left-content{
    position: relative;
    z-index: 2;
    max-width: 500px;
}

.brand-lockup{
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 12px;
}

.brand-logo{
    width: min(100%, 360px);
    max-width: 360px;
    height: auto;
    object-fit: contain;
    display: block;
}

.badge{
    display: inline-block;
    padding: 10px 18px;
    border-radius: 30px;
    background: rgba(0,217,255,0.12);
    border: 1px solid rgba(0,217,255,0.2);
    color: var(--accent);
    margin-bottom: 30px;
    font-size: 0.9rem;
}

.description{
    line-height: 1.7;
    color: var(--text-soft);
    margin-bottom: 34px;
}

/* PROGRESS */

.progress-container{
    margin-bottom: 30px;
}

.progress-info{
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: var(--text-soft);
}

.progress-bar{
    width: 100%;
    height: 10px;
    border-radius: 30px;
    background: var(--line);
    overflow: hidden;
}

.progress{
    width: 25%;
    height: 100%;
    background: var(--accent);
    border-radius: 30px;
    transition: 0.4s;
}

/* STEPS */

.steps{
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step{
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 14px;
    border-radius: 16px;
    border: 1px solid transparent;
    background: rgba(255,255,255,0.02);
    opacity: 0.45;
    transition: 0.3s ease;
}

.step.active{
    opacity: 1;
    border-color: rgba(0,217,255,0.35);
    background: rgba(0,217,255,0.08);
    box-shadow: 0 10px 24px rgba(0,0,0,0.18);
}

.step span{
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #00d9ff;
    font-weight: bold;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.08);
    transition: 0.3s ease;
}

.step.active span{
    background: rgba(0,217,255,0.18);
    color: #8af0ff;
    box-shadow: 0 0 0 1px rgba(0,217,255,0.18);
}

.step p{
    transition: 0.3s ease;
}

.step.active p{
    color: #ffffff;
    font-weight: 700;
}

/* RIGHT PANEL */

.right-panel{
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 28px;
    gap: 12px;
}

.theme-row{
    width: min(100%, 650px);
    display: flex;
    justify-content: flex-end;
}

.theme-toggle{
    min-height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-main);
    font-weight: 700;
    cursor: pointer;
}

.theme-toggle:hover{
    color: var(--accent);
    border-color: var(--accent);
}

/* FORM CARD */

.form-card{
    width: 100%;
    max-width: 650px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 34px;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.form-step{
    display: none;
    animation: fade 0.4s ease;
}

.form-step.active{
    display: block;
}

@keyframes fade{
    from{
        opacity: 0;
        transform: translateY(10px);
    }

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

.form-step h2{
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.subtitle{
    color: var(--text-soft);
    margin-bottom: 24px;
    line-height: 1.7;
}

.error-box{
    margin-bottom: 24px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid rgba(255,122,89,0.35);
    background: rgba(255,122,89,0.12);
    color: #ffd7cc;
    line-height: 1.5;
}

/* INPUTS */

.input-group{
    margin-bottom: 18px;
}

.input-group label{
    display: block;
    margin-bottom: 12px;
    color: var(--text-soft);
}

.input-group input,
.input-group select{
    width: 100%;
    padding: 16px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text-main);
    outline: none;
    transition: 0.3s;
}

.input-group input:focus,
.input-group select:focus{
    border-color: #00d9ff;
    box-shadow: 0 0 15px rgba(0,217,255,0.2);
}

.input-group select option{
    background: var(--bg-soft);
    color: var(--text-main);
}

/* RANGE */

.range-shell{
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.range-header{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    color: var(--text-soft);
    font-size: 0.9rem;
}

.range-hint{
    min-width: 48px;
}

.range-value{
    min-width: 76px;
    padding: 7px 12px;
    border-radius: 999px;
    text-align: center;
    font-weight: 700;
    color: #08111f;
    background: linear-gradient(135deg, #8af0ff, var(--accent));
    box-shadow: 0 8px 18px rgba(0,217,255,0.16);
}

input[type="range"]{
    width: 100%;
    --range-fill: 50%;
    appearance: none;
    -webkit-appearance: none;
    background:
        linear-gradient(90deg, var(--accent) 0 var(--range-fill), rgba(255,255,255,0.12) var(--range-fill) 100%);
    border-radius: 999px;
    height: 12px;
    cursor: pointer;
    outline: none;
}

input[type="range"]::-webkit-slider-runnable-track{
    height: 12px;
    background: transparent;
    border-radius: 999px;
}

input[type="range"]::-webkit-slider-thumb{
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #ffffff;
    border: 3px solid var(--accent);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
    margin-top: -5px;
}

input[type="range"]::-moz-range-track{
    height: 12px;
    background: rgba(255,255,255,0.12);
    border-radius: 999px;
}

input[type="range"]::-moz-range-progress{
    height: 12px;
    background: var(--accent);
    border-radius: 999px;
}

input[type="range"]::-moz-range-thumb{
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #ffffff;
    border: 3px solid var(--accent);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
}

/* BUTTONS */

.buttons{
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 24px;
}

.buttons button{
    flex: 1;
    padding: 16px;
    border: none;
    border-radius: 14px;
    font-size: 0.98rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
}

#prevBtn{
    background: rgba(255,255,255,0.08);
    color: var(--text-main);
}

#nextBtn,
#submitBtn{
    background: var(--accent);
    color: #08111f;
}

.buttons button:hover{
    transform: translateY(-2px);
}

#submitBtn{
    display: none;
}

/* RESPONSIVE */

@media(max-width: 1000px){

    .container{
        flex-direction: column;
    }

    .left-panel{
        display: none;
    }

    .right-panel{
        width: 100%;
        padding: 20px;
    }

    .theme-row,
    .form-card{
        width: 100%;
        max-width: 100%;
    }

    .form-card{
        padding: 24px;
    }

    .range-header{
        font-size: 0.85rem;
    }

    .range-value{
        min-width: 70px;
        padding: 6px 10px;
    }

}

@media(max-width: 560px){

    .right-panel{
        padding: 16px;
    }

    .theme-row{
        justify-content: stretch;
    }

    .theme-toggle{
        width: 100%;
    }

    .form-card{
        padding: 20px;
        border-radius: 18px;
    }

    .form-step h2{
        font-size: 1.5rem;
    }

    .subtitle{
        font-size: 0.95rem;
    }

    .input-group input,
    .input-group select{
        padding: 14px;
    }

    .buttons{
        flex-direction: column;
        gap: 12px;
    }

    .buttons button{
        width: 100%;
    }

    .range-header{
        align-items: flex-start;
    }

}