/* ============================================
   DHtech Monitoring - 로그인 페이지
   ============================================ */

:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-card: #242b3d;
    --bg-hover: #2d3548;
    --text-primary: #e7e9ea;
    --text-secondary: #8b98a5;
    --text-muted: #6e7681;
    --accent-primary: #1d9bf0;
    --accent-success: #00ba7c;
    --accent-warning: #ffad1f;
    --accent-error: #f4212e;
    --accent-purple: #7856ff;
    --border-color: #2f3336;
    --border-radius: 16px;
    --border-radius-sm: 10px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'IBM Plex Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* 배경 효과 */
.login-container {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bg-effect {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(29, 155, 240, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(120, 86, 255, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(0, 186, 124, 0.05) 0%, transparent 50%);
    pointer-events: none;
    animation: bgPulse 8s ease-in-out infinite alternate;
}

@keyframes bgPulse {
    0% { opacity: 0.6; }
    100% { opacity: 1; }
}

/* 로그인 카드 */
.login-card {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 440px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 48px 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: cardAppear 0.5s ease-out;
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 흔들기 효과 (로그인 실패 시) */
.login-card.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* 로고 */
.login-logo {
    text-align: center;
    margin-bottom: 36px;
}

.logo-shield {
    font-size: 56px;
    display: block;
    margin-bottom: 16px;
    animation: shieldPulse 3s ease-in-out infinite;
}

@keyframes shieldPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.login-logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-logo p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* 폼 */
.login-form h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    text-align: center;
}

.form-desc {
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 24px;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    font-size: 16px;
    z-index: 1;
}

.input-wrapper input {
    width: 100%;
    padding: 14px 16px 14px 44px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.2s;
    outline: none;
}

.input-wrapper input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(29, 155, 240, 0.15);
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    padding: 4px;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.toggle-password:hover {
    opacity: 1;
}

/* 비밀번호 강도 표시 */
.password-strength {
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.strength-bar {
    flex: 1;
    height: 4px;
    background: var(--bg-hover);
    border-radius: 2px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    border-radius: 2px;
    transition: all 0.3s;
}

/* 에러 메시지 */
.error-message {
    min-height: 20px;
    font-size: 13px;
    color: var(--accent-error);
    text-align: center;
    margin-bottom: 8px;
    transition: all 0.2s;
}

/* 제출 버튼 */
.btn-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.btn-submit:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(29, 155, 240, 0.3);
}

.btn-submit:active:not(:disabled) {
    transform: translateY(0);
}

.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* 보안 안내 */
.security-notice {
    margin-top: 32px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

/* 반응형 */
@media (max-width: 480px) {
    .login-card {
        margin: 16px;
        padding: 32px 24px;
    }
    
    .login-logo h1 {
        font-size: 20px;
    }
    
    .logo-shield {
        font-size: 44px;
    }
}