/* ========================================
   CSS Variables & Theme Support
   ======================================== */
:root {
    --primary-red: #c61f1f;
    --dark-red: #902929;
    --darker-red: #990000;
}

/* Dark Theme (Default) */
html[data-theme="dark"] {
    --bg-gradient-start: #000000;
    --bg-gradient-mid: #1a1a1a;
    --bg-gradient-end: #000000;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --input-bg: rgba(255, 255, 255, 0.08);
    --input-border: rgba(255, 255, 255, 0.1);
    --input-placeholder: rgba(255, 255, 255, 0.4);
}

/* Light Theme */
html[data-theme="light"] {
    --bg-gradient-start: #f8f9fa;
    --bg-gradient-mid: #e9ecef;
    --bg-gradient-end: #ffe5e5;
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(0, 0, 0, 0.1);
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-tertiary: #6c757d;
    --input-bg: rgba(255, 255, 255, 0.9);
    --input-border: rgba(0, 0, 0, 0.2);
    --input-placeholder: rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: background 0.3s ease;
}

/* Theme Transition Class */
body.theme-transitioning,
body.theme-transitioning * {
    transition: background 0.3s ease,
                color 0.3s ease,
                border-color 0.3s ease,
                box-shadow 0.3s ease !important;
}

/* ========================================
   Theme Toggle Button
   ======================================== */
.theme-toggle-wrapper {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 1000;
}

.theme-toggle-btn {
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    color: var(--primary-red);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(198, 31, 31, 0.2);
}

.theme-toggle-btn:hover {
    background: rgba(198, 31, 31, 0.1);
    transform: scale(1.1) rotate(20deg);
    box-shadow: 0 6px 20px rgba(198, 31, 31, 0.3);
}

.theme-icon {
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

html[data-theme="light"] .theme-icon {
    color: #ffa500;
}

/* ========================================
   Login Container & Card
   ======================================== */
.login-container {
    max-width: 450px;
    width: 100%;
}

.login-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid var(--card-border);
    box-shadow: 0 8px 32px rgba(198, 31, 31, 0.3);
    overflow: hidden;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Login Header
   ======================================== */
.login-header {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    padding: 20px 30px;
    text-align: center;
    border-bottom: 3px solid var(--darker-red);
}

.login-icon {
    font-size: 4rem;
    color: #ffffff;
    margin-bottom: 15px;
    animation: pulse 2s infinite;
}

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

.login-title {
    color: #ffffff;
    font-size: 1.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 5px;
}

.login-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    letter-spacing: 1px;
}

/* ========================================
   Login Body & Form
   ======================================== */
.login-body {
    padding: 40px 30px;
}

.form-label {
    color: var(--text-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.875rem;
    margin-bottom: 10px;
}

.required {
    color: var(--primary-red);
}

.form-control {
    background: none;
    border: 2px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-primary);
    padding: 10px 20px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control::placeholder {
    color: var(--input-placeholder);
}

.form-control:focus {
    background: none !important;
    border-color: var(--primary-red);
    box-shadow: none !important;
    color: var(--text-primary);
}

.input-group-text {
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-right: none;
    color: var(--primary-red);
    font-size: 1.2rem;
    border-radius: 10px;
}

.input-group .form-control {
    border-left: none;
}

.input-group:focus-within .input-group-text {
    border-color: var(--primary-red);
    background: var(--input-bg);
}

.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1.2rem;
    z-index: 10;
    transition: all 0.3s ease;
}

.password-toggle:hover {
    color: var(--primary-red);
}


.form-check-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
}

.form-check-input {
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    cursor: pointer;
}

.form-check-input:checked {
    background-color: var(--primary-red);
    border-color: var(--primary-red);
}

.form-check-input:focus {
    box-shadow: 0 0 0 0.25rem rgba(198, 31, 31, 0.25);
}


/*Login Button*/
.btn-login {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: #ffffff;
    font-size: 1.125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: none;
    border-radius: 10px;
    padding: 18px;
    width: 100%;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(198, 31, 31, 0.3);
}

.btn-login:hover {
    background: linear-gradient(135deg, var(--dark-red) 0%, var(--darker-red) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(198, 31, 31, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

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

.loading-spinner {
    display: none;
    margin-right: 10px;
}

.btn-login.loading .loading-spinner {
    display: inline-block;
}

/* ========================================
   Alerts & Validation
   ======================================== */
.alert {
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    border: none;
}

.alert-danger {
    background: rgba(220, 53, 69, 0.2);
    color: #ff6b6b;
    border: 1px solid rgba(220, 53, 69, 0.3);
}

.alert-success {
    background: rgba(0, 255, 0, 0.1);
    color: #00ff00;
    border: 1px solid rgba(0, 255, 0, 0.3);
}

html[data-theme="light"] .alert-danger {
    background: rgba(220, 53, 69, 0.15);
    color: #dc3545;
}

html[data-theme="light"] .alert-success {
    background: rgba(25, 135, 84, 0.15);
    color: #198754;
}

.invalid-feedback {
    color: var(--primary-red);
    font-size: 0.875rem;
    display: none;
}

.form-control.is-invalid {
    border-color: var(--primary-red);
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

/* ========================================
   Login Footer
   ======================================== */
.login-footer {
    background: transparent;
    border-top: 1px solid var(--card-border);
    padding: 20px 30px;
    text-align: center;
}

.footer-text {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin: 0;
}

.footer-text i {
    color: var(--primary-red);
}

/* Responsive Design */
@media (max-width: 576px) {
    .theme-toggle-wrapper {
        top: 20px;
        right: 20px;
    }

    .theme-toggle-btn {
        width: 45px;
        height: 45px;
    }

    .theme-icon {
        font-size: 1.3rem;
    }

    .login-header {
        padding: 0 20px;
    }

    .login-body {
        padding: 30px 20px;
    }

    .login-title {
        font-size: 1.5rem;
    }

    .login-icon {
        font-size: 3rem;
    }
}