/* [사장님 기강 확립] 1초도 쉬지 않는 프리미엄 스타일링 v1.3 */
/* "새로운 코딩이 멈추면 심장도 멈춘다!" - Agent Omega */
@import url('https://fonts.googleapis.com/css2?family=Spline+Sans:wght@400;700&display=swap');

:root {
    --primary: #25f48c; /* Habit Green */
    --secondary: #58a6ff;
    --bg: #0d1117;
    --card: #161b22;
    --text: #c9d1d9;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Spline Sans', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 0;
    margin: 0;
    background: radial-gradient(at 0% 0%, rgba(37, 244, 140, 0.12) 0px, transparent 50%),
                radial-gradient(at 50% 0%, rgba(88, 166, 255, 0.08) 0px, transparent 50%),
                radial-gradient(at 100% 0%, rgba(255, 0, 80, 0.05) 0px, transparent 50%);
    background-attachment: fixed;
}

#app {
    width: 100%;
    max-width: 600px;
    padding: 3rem;
    background: #161b22; /* Solid background */
    border-radius: 28px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.5);
    animation: slideInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(40px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

header h1 {
    font-size: 2.8rem;
    color: var(--primary);
    margin-bottom: 0px;
}

header p { font-size: 1.1rem; opacity: 0.7; }

.input-group {
    margin-top: 3rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

input {
    background: var(--card);
    border: 1px solid #30363d;
    padding: 1.2rem;
    color: white;
    font-size: 1rem;
    border-radius: 12px; /* 영자's 12px rule */
    outline: none;
    transition: border-color 0.2s;
}

input:focus { border-color: var(--primary); }

button {
    position: relative;
    overflow: hidden;
    background: var(--primary);
    color: #000;
    font-weight: 700;
    border: none;
    padding: 1.2rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(37, 244, 140, 0.3);
}

button:hover {
    transform: translateY(-3px);
    background: #1ed77c;
    box-shadow: 0 8px 25px rgba(37, 244, 140, 0.5);
}

button:active {
    transform: translateY(-1px);
}

.question-card {
    background: var(--card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid #30363d;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
}

.question-card:hover {
    transform: scale(1.02);
    border-color: var(--primary);
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.hidden { display: none; }