:root {
    --bg: #f9fafb;
    --panel: #ffffff;
    --panel-2: #f3f4f6;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #facc15;
    --primary-2: #f59e0b;
    --success: #16a34a;
    --teacher: #0284c7;
    --external: #7c3aed;
    --card: #ffffff;
    --border: rgba(0,0,0,.08);
    --ring: rgba(250, 204, 21, .4);
    --radius: 16px;
    --shadow-1: 0 4px 10px rgba(0,0,0,.08);
    --shadow-2: 0 8px 24px rgba(0,0,0,.12);
    --ts: 180ms;
}

*{ box-sizing: border-box; }
img{ display: block; max-width: 100%; height: auto; }
a{ text-decoration: none; color: inherit; }

body {
    background: var(--bg);
    font-family: system-ui, sans-serif;
    color: var(--text);
}

.register-container{
    max-width: 1200px;
    margin: clamp(20px,4vw,48px) auto;
    padding: clamp(16px,3vw,24px);
}

.register-header{
    margin-bottom: clamp(18px,2.5vw,28px);
    text-align: center;
}

.register-title{
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font: 700 clamp(20px,2.6vw,28px)/1.15 system-ui, sans-serif;
    color: var(--text);
}

.register-title i{ color: var(--primary); }

.register-subtitle{
    margin-top: 8px;
    color: var(--muted);
    font-size: clamp(14px,1.6vw,16px);
}

.register-grid{
    display: grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: clamp(14px,2vw,22px);
}

@media (max-width: 980px){
    .register-grid{ grid-template-columns: repeat(1, minmax(0,1fr)); }
}
@media (max-width: 620px){
    .register-grid{ grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
    .register-grid{
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .card-media,
    .card-text {
        display: none !important;
    }

    .register-card{
        display: grid;
        grid-template-columns: 1fr auto;
        align-items: center;
        padding: 14px 16px;
        gap: 8px;
        border-radius: 12px;
        box-shadow: none;
        border: 1px solid var(--border);
    }

    .card-title{
        margin: 0;
        font-size: 1rem;
        font-weight: 700;
    }

    .card-chip{
        background: transparent;
        border: none;
        padding: 0;
        border-radius: 0;
        color: var(--text);
        font-weight: 700;
    }

    .btn-card{
        height: auto;
        min-width: 36px;
        padding: 0;
        border-radius: 999px;
        background: transparent;
        box-shadow: none;
        color: var(--muted);
        font-weight: 700;
    }

    .register-card:hover{
        transform: none;
        border-color: rgba(0,0,0,.14);
        box-shadow: 0 2px 6px rgba(0,0,0,.06);
    }

    .register-card:not(:last-child){
        position: relative;
    }
    .register-card:not(:last-child)::after{
        content: "";
        position: absolute;
        left: 16px;
        right: 16px;
        bottom: -5px;
        height: 1px;
        background: rgba(0,0,0,.05);
    }
}

@media (max-width: 520px){
    .btn-card::after{
        content: "›";
        display: inline-block;
        font-size: 20px;
        line-height: 1;
        transform: translateY(1px);
        margin-left: 2px;
    }
}

.register-card{
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 14px;
    padding: 20px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-1);
    transition: transform var(--ts) ease, box-shadow var(--ts) ease, border-color var(--ts) ease;
}

.register-card:hover{
    transform: translateY(-3px);
    box-shadow: var(--shadow-2);
    border-color: rgba(0,0,0,.12);
}

.card-media{
    display: grid;
    place-items: center;
    aspect-ratio: 16/9;
    border-radius: calc(var(--radius) - 6px);
    background: var(--panel-2);
    border: 1px dashed var(--border);
    overflow: hidden;
}
.card-media img{ width: clamp(70px, 30%, 110px); }

.card-body{ display: grid; gap: 8px; }

.card-title{ font-size: clamp(18px,2vw,20px); margin: 0; }
.card-chip{
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-weight: 600;
    background: var(--panel-2);
    border: 1px solid var(--border);
    color: var(--text);
}

.card-text{
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.btn-card{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 42px;
    border-radius: 10px;
    font-weight: 700;
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%);
    color: #1f2937;
    box-shadow: 0 2px 6px rgba(0,0,0,.15);
    transition: transform var(--ts) ease;
}
.register-card:hover .btn-card{ transform: translateY(-1px); }

.register-card.student:hover{ border-color: var(--success); }
.register-card.teacher:hover{ border-color: var(--teacher); }
.register-card.external:hover{ border-color: var(--external); }

.register-card.student .card-chip{ color: var(--success); }
.register-card.teacher .card-chip{ color: var(--teacher); }
.register-card.external .card-chip{ color: var(--external); }