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

:root {
    --login-gradient-start: #2a5298;
    --login-gradient-end: #1e3c72;
    --login-bg-light: #ffffff;
    --login-bg-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

[data-theme="dark"] {
    --login-gradient-start: #4a7bc8;
    --login-gradient-end: #2a5298;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--login-bg-light);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
    transition: background 0.3s ease;
}

[data-theme="dark"] body {
    background: var(--login-bg-dark);
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(42, 82, 152, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(30, 60, 114, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(42, 82, 152, 0.03) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
    opacity: 1;
}

[data-theme="dark"] body::before {
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.login-wrapper {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 480px;
}

.login-container {
    background: #ffffff;
    border-radius: 24px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.15);
    width: 100%;
    padding: 50px 40px;
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .login-container {
    background: var(--card-bg);
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--card-border);
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--login-gradient-start), var(--login-gradient-end));
}

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

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #2a5298;
    text-decoration: none;
    margin-bottom: 20px;
    font-size: 14px;
    transition: all 0.3s ease;
}

[data-theme="dark"] .back-link {
    color: var(--accent-primary);
}

.back-link:hover {
    transform: translateX(-3px);
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo-container {
    margin-bottom: 25px;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: logoFadeIn 0.8s ease;
}

@keyframes logoFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.logo-container img {
    max-width: 180px;
    max-height: 80px;
    object-fit: contain;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

[data-theme="dark"] .logo-container img {
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.login-header h1 {
    color: #2a5298;
    font-size: 32px;
    margin-bottom: 8px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

[data-theme="dark"] .login-header h1 {
    color: var(--accent-primary);
}

.login-header p {
    color: #666666;
    font-size: 15px;
    font-weight: 400;
}

[data-theme="dark"] .login-header p {
    color: var(--text-secondary);
}

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

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: #333333;
    font-weight: 600;
    font-size: 14px;
}

[data-theme="dark"] .form-group label {
    color: var(--text-primary);
}

.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: #999999;
    font-size: 16px;
    transition: color 0.3s ease;
}

[data-theme="dark"] .input-icon i {
    color: var(--text-light);
}

.input-icon:focus-within i {
    color: #2a5298;
}

[data-theme="dark"] .input-icon:focus-within i {
    color: var(--accent-primary);
}

.form-group input {
    width: 100%;
    padding: 16px 18px 16px 50px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: #ffffff;
    color: #333333;
}

[data-theme="dark"] .form-group input {
    border: 2px solid var(--card-border);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: #2a5298;
    box-shadow: 0 0 0 4px rgba(42, 82, 152, 0.1);
    transform: translateY(-2px);
}

[data-theme="dark"] .form-group input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(74, 123, 200, 0.2);
}

.form-group input::placeholder {
    color: #999999;
}

[data-theme="dark"] .form-group input::placeholder {
    color: var(--text-light);
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--login-gradient-start) 0%, var(--login-gradient-end) 100%);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(42, 82, 152, 0.3);
}

.btn-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-submit:hover:not(:disabled)::before {
    left: 100%;
}

.btn-submit:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(42, 82, 152, 0.4);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.otp-step-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
}

.otp-step-actions .btn-submit {
    margin-top: 0;
}

.btn-resend-otp {
    width: 100%;
    padding: 14px 16px;
    background: transparent;
    color: var(--login-gradient-start, #2a5298);
    border: 2px solid rgba(42, 82, 152, 0.35);
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-resend-otp:hover:not(:disabled) {
    border-color: var(--login-gradient-start, #2a5298);
    background: rgba(42, 82, 152, 0.06);
}

.btn-resend-otp:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

[data-theme="dark"] .btn-resend-otp {
    color: var(--accent-primary, #4a7bc8);
    border-color: rgba(74, 123, 200, 0.45);
}

[data-theme="dark"] .btn-resend-otp:hover:not(:disabled) {
    border-color: var(--accent-primary, #4a7bc8);
    background: rgba(74, 123, 200, 0.12);
}

.alert {
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: shake 0.5s ease, fadeIn 0.3s ease;
    border-left: 4px solid;
    transition: opacity 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

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

.alert-error {
    background: rgba(204, 51, 51, 0.1);
    color: #c33;
    border-left-color: #c33;
}

[data-theme="dark"] .alert-error {
    background: rgba(204, 51, 51, 0.2);
}

.alert-success {
    background: rgba(51, 204, 51, 0.1);
    color: #3c3;
    border-left-color: #3c3;
}

[data-theme="dark"] .alert-success {
    background: rgba(51, 204, 51, 0.2);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 480px) {
    .login-container {
        padding: 35px 25px;
        border-radius: 20px;
    }
    
    .login-header h1 {
        font-size: 26px;
    }
}