:root {
    --primary: #DC2626;
    --primary-dark: #B91C1C;
    --dark: #111827;
    --dark-light: #1F2937;
    --text: #1F2937;
    --text-light: #6B7280;
    --text-gray: #9CA3AF;
    --white: #FFFFFF;
    --gray-light: #F3F4F6;
    --border: #E5E7EB;
}

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

body {
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    background: var(--dark);
    overflow-x: hidden;
}

.login-page {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 100%);
}

.background-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(30deg, transparent 48%, rgba(220, 38, 38, 0.02) 50%, transparent 52%),
    linear-gradient(-30deg, transparent 48%, rgba(220, 38, 38, 0.02) 50%, transparent 52%);
    background-size: 40px 40px;
    opacity: 0.6;
}

.content-wrapper {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1100px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.logo-section {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.main-logo {
    width: 100%;
    max-width: 450px;
    height: auto;
}

.system-title {
    font-size: 26px;
    line-height: 1.3;
    color: #FFFFFF;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.login-form-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-card {
    position: relative;
    background: var(--white);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.card-corner {
    position: absolute;
    top: 0;
    right: 0;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary) 0%, #F59E0B 100%);
    clip-path: polygon(100% 0, 0 0, 100% 100%);
    border-radius: 0 16px 0 0;
}

.card-corner::after {
    content: '';
    position: absolute;
    top: 12px;
    right: 12px;
    width: 8px;
    height: 8px;
    background: var(--white);
    border-radius: 50%;
}

.form-header {
    margin-bottom: 24px;
}

.form-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}

.form-header p {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 400;
}

.form-field {
    margin-bottom: 18px;
}

.form-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.input-box {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.input-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-gray);
    font-size: 14px;
    transition: color 0.3s;
    pointer-events: none;
    z-index: 1;
}

.input-box input {
    width: 100%;
    height: 38px;
    padding: 0 12px 0 38px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text);
    background: var(--white);
    transition: all 0.3s;
    outline: none;
    line-height: 38px;
}

.input-box input::placeholder {
    color: var(--text-gray);
}

.input-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.08);
}

.input-box:focus-within i {
    color: var(--primary);
}

.toggle-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-gray);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s;
    z-index: 2;
}

.toggle-btn:hover {
    color: var(--primary);
    background: var(--gray-light);
}

.toggle-btn i {
    position: static;
    transform: none;
    font-size: 13px;
}

.error-alert {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 13px;
    color: #991B1B;
}

.error-alert i {
    font-size: 14px;
    flex-shrink: 0;
}

.field-error {
    display: block;
    margin-top: 6px;
    padding: 6px 10px;
    background: #FEF2F2;
    border-radius: 6px;
    font-size: 12px;
    color: #991B1B;
}

.submit-button {
    width: 100%;
    height: 40px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 20px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 20px;
}

.submit-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 8px 16px rgba(220, 38, 38, 0.3);
}

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

.submit-button i {
    font-size: 13px;
}

.submit-button.loading span,
.submit-button.loading i {
    opacity: 0;
}

.submit-button.loading .button-loader {
    opacity: 1;
}

.button-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    opacity: 0;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.info-box {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 18px;
    padding: 11px 14px;
    background: var(--gray-light);
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-light);
    line-height: 1.5;
}

.info-box i {
    color: var(--primary);
    margin-top: 2px;
    font-size: 14px;
    flex-shrink: 0;
}

.features-list {
    display: flex;
    gap: 16px;
}

.feature {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    transition: all 0.3s;
}

.feature:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-3px);
}

.feature i {
    font-size: 20px;
    color: var(--primary);
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature span {
    font-size: 12px;
    color: #D1D5DB;
    text-align: center;
    font-weight: 500;
    line-height: 1.3;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 9999;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.spinner-box {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin-overlay 0.7s linear infinite;
}

@keyframes spin-overlay {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
        max-width: 500px;
    }

    .logo-section {
        text-align: center;
        align-items: center;
    }

    .main-logo {
        max-width: 380px;
    }

    .system-title {
        font-size: 22px;
    }
}

@media (max-width: 768px) {
    .content-wrapper {
        gap: 32px;
    }

    .main-logo {
        max-width: 320px;
    }

    .system-title {
        font-size: 20px;
    }

    .form-card {
        padding: 28px 24px;
    }

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

    .feature {
        flex-direction: row;
        justify-content: flex-start;
        padding: 12px 14px;
    }

    .feature span {
        text-align: left;
    }
}

@media (max-width: 480px) {
    .login-page {
        padding: 16px;
    }

    .main-logo {
        max-width: 280px;
    }

    .system-title {
        font-size: 18px;
    }

    .form-card {
        padding: 24px 20px;
    }

    .card-corner {
        width: 60px;
        height: 60px;
    }

    .form-header h2 {
        font-size: 20px;
    }

    .input-box input {
        height: 38px;
        padding: 0 10px 0 36px;
        font-size: 14px;
    }

    .input-box i {
        left: 10px;
        font-size: 13px;
    }

    .submit-button {
        height: 38px;
        padding: 0 18px;
        font-size: 14px;
    }
}