/* ----------- General Light Mode ----------- */
body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.4s ease, color 0.4s ease;
}

.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.login-card {
    background: #ffffff;
    padding: 30px 25px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    width: 350px;
    text-align: center;
    transition: background 0.4s ease, color 0.4s ease;
}

.icon-header {
    font-size: 42px;
    background: #42a5f5;
    color: #fff;
    width: 70px;
    height: 70px;
    line-height: 70px;
    margin: 0 auto 15px;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(66,165,245,0.5);
}

.login-title {
    font-size: 22px;
    font-weight: bold;
    color: #1565c0;
    margin-bottom: 5px;
}

.login-subtitle {
    font-size: 14px;
    color: #555;
    margin-bottom: 20px;
}

.alert {
    padding: 10px;
    border-radius: 5px;
    font-size: 14px;
    margin-bottom: 15px;
    text-align: left;
}
.alert-error {
    background: #fdecea;
    color: #b71c1c;
    border: 1px solid #f5c6cb;
}
.alert-success {
    background: #e6f4ea;
    color: #1b5e20;
    border: 1px solid #c3e6cb;
}

.form-group {
    margin-bottom: 15px;
    text-align: left;
}
.form-group label {
    display: block;
    font-size: 13px;
    color: #444;
    margin-bottom: 5px;
}
.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s, background 0.3s;
}
.form-group input:focus {
    border-color: #42a5f5;
    box-shadow: 0 0 5px rgba(66,165,245,0.3);
}

.btn {
    width: 100%;
    padding: 10px;
    font-size: 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
}
.primary-btn {
    background: #42a5f5;
    color: #fff;
}
.primary-btn:hover {
    background: #1e88e5;
    transform: scale(1.03);
}

.toggle-btn {
    margin-top: 10px;
    background: #6c757d;
    color: white;
}
.toggle-btn:hover {
    background: #5a6268;
}

/* ----------- Dark Mode ----------- */
body.dark-mode {
    background: linear-gradient(135deg, #141e30, #243b55);
    color: #e0e0e0;
}

body.dark-mode .login-card {
    background: #1f2937;
    color: #e0e0e0;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

body.dark-mode .icon-header {
    background: #00bfa5;
    box-shadow: 0 4px 15px rgba(0, 191, 165, 0.5);
}

body.dark-mode .login-title {
    color: #80deea;
}

body.dark-mode .login-subtitle {
    color: #b0bec5;
}

body.dark-mode .form-group label {
    color: #cfd8dc;
}
body.dark-mode .form-group input {
    background: #374151;
    color: #fff;
    border: 1px solid #546e7a;
}
body.dark-mode .form-group input:focus {
    border-color: #00bfa5;
    box-shadow: 0 0 5px rgba(0, 191, 165, 0.4);
}

body.dark-mode .primary-btn {
    background: #00bfa5;
}
body.dark-mode .primary-btn:hover {
    background: #008e76;
}

body.dark-mode .toggle-btn {
    background: #455a64;
}
body.dark-mode .toggle-btn:hover {
    background: #37474f;
}

body.dark-mode .alert-error {
    background: #3e2723;
    color: #ef9a9a;
    border: 1px solid #ef5350;
}
body.dark-mode .alert-success {
    background: #1b5e20;
    color: #a5d6a7;
    border: 1px solid #66bb6a;
}

/* ----------- Mobile Friendly ----------- */
@media (max-width: 480px) {
    .login-card {
        width: 90%;
    }
}