:root {
    --bg-gradient-start: #1e3a5f;
    --bg-gradient-end: #0d1b2a;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --input-bg: #f8f9fa;
    --input-border: #e9ecef;
    --text-primary: #1e3a5f;
    --text-secondary: #6c757d;
    --btn-primary: #0d6efd;
}

[data-theme="dark"] {
    --bg-gradient-start: #0d1b2a;
    --bg-gradient-end: #000000;
    --card-bg: #1a2332;
    --card-shadow: rgba(0, 0, 0, 0.5);
    --input-bg: #2a3444;
    --input-border: #3a4454;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
    --btn-primary: #0d6efd;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    transition: background 0.3s ease;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    box-shadow: 0 2px 10px var(--card-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    z-index: 1000;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.login-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 20px 60px var(--card-shadow);
    padding: 50px 40px;
    width: 100%;
    max-width: 420px;
    text-align: center;
    transition: all 0.3s ease;
}

.login-logo {
    margin-bottom: 30px;
}

.login-logo .logo-img {
    max-width: 280px;
    height: auto;
    margin-bottom: 10px;
}

.login-logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.login-logo p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-floating {
    margin-bottom: 15px;
}

.form-floating .form-control {
    height: 55px;
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    padding-left: 45px;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-floating .form-control:focus {
    border-color: var(--btn-primary);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
    background-color: var(--input-bg);
}

.form-floating label {
    padding-left: 45px;
    color: var(--text-secondary);
}

.form-floating label i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.btn-login {
    width: 100%;
    height: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 10px;
    margin-top: 10px;
    background: var(--btn-primary);
    border: none;
    transition: all 0.3s ease;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(13, 110, 253, 0.4);
}

.business-address {
    padding-top: 20px;
    border-top: 1px solid var(--input-border);
}

.business-address small {
    line-height: 1.6;
    color: var(--text-secondary);
}

.copyright {
    margin-top: 30px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

.alert {
    border-radius: 10px;
    margin-bottom: 20px;
}

@media (max-width: 480px) {
    .login-card {
        padding: 30px 25px;
    }
    
    .login-logo .logo-img {
        max-width: 200px;
    }
}