@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&family=Noto+Sans+KR:wght@300;400;700&display=swap');

:root {
    --color-bg: #090d16;
    --color-card-bg: rgba(15, 23, 42, 0.45);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-accent: #a855f7;
    --color-accent-hover: #9333ea;
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-warning: #ea580c;
    --color-warning-hover: #c2410c;
}

body {
    background-color: var(--color-bg);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(168, 85, 247, 0.15), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.15), transparent 40%);
    background-attachment: fixed;
    color: var(--color-text);
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow: hidden;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 1.5rem;
    box-sizing: border-box;
    perspective: 1000px;
}

.auth-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    display: inline-block;
    animation: pulse 2s infinite alternate;
}

.icon-accent {
    color: var(--color-accent);
}

.icon-warning {
    color: var(--color-warning);
}

@keyframes pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.05); }
}

.auth-title {
    font-size: 1.6rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 30%, #c084fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.title-warning {
    background: linear-gradient(135deg, #fff 30%, #f97316 100%);
}

.auth-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0.4rem 0 0 0;
}

.subtitle-warning {
    color: #fdba74;
}

.form-group {
    position: relative;
    margin-bottom: 1.25rem;
}

.form-group i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-size: 0.95rem;
    transition: color 0.3s;
}

.form-control {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: 8px;
    padding: 0.8rem 1rem 0.8rem 2.8rem;
    box-sizing: border-box;
    outline: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-control:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 10px rgba(168, 85, 247, 0.3);
    background: rgba(15, 23, 42, 0.8);
}

.form-control:focus + i {
    color: var(--color-accent);
}

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, var(--color-accent) 0%, #7c3aed 100%);
    border: none;
    color: #fff;
    padding: 0.8rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.5);
    background: linear-gradient(135deg, #b865ff 0%, #8c4aff 100%);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-submit.btn-warning {
    background: linear-gradient(135deg, var(--color-warning) 0%, #c2410c 100%);
    box-shadow: 0 4px 15px rgba(234, 88, 12, 0.3);
}

.btn-submit.btn-warning:hover {
    background: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #f87171;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    font-size: 0.82rem;
    margin-bottom: 1.25rem;
    display: none;
    align-items: center;
    gap: 0.5rem;
}

.force-change-border {
    border-color: var(--color-warning) !important;
    box-shadow: 0 0 25px rgba(234, 88, 12, 0.25) !important;
}

.hidden {
    display: none;
}