/* ========================================
 * LOGIN PAGE STYLES - อัปเดตโทนสีตามภาพ
 * Page-specific styles used alongside Bootstrap classes
 * ======================================== */

:root {
    /* โทนสีใหม่ตามภาพ - gradient จากเขียวเข้มไปเขียวอ่อนและเหลืองครีม */
    --teal-deep: #5fb3b3;      /* สีเขียวเข้ม (บนสุด) */
    --mint-medium: #88c999;     /* สีเขียวกลาง */
    --mint-light: #b8e6c1;      /* สีเขียวอ่อน */
    --cream-yellow: #f0e6a6;    /* สีเหลืองครีม (ล่างสุด) */
    
    /* สีหลักของระบบ */
    --primary-color: var(--teal-deep);
    --primary-light: var(--mint-medium);
    --primary-dark: #4a9999;
    
    /* Gradient Background ตามภาพ */
    --gradient-bg: linear-gradient(180deg, 
        var(--teal-deep) 0%, 
        var(--mint-medium) 33%, 
        var(--mint-light) 66%, 
        var(--cream-yellow) 100%);
}

body {
    font-family: 'IBM Plex Sans Thai', sans-serif;
    background: var(--gradient-bg);
    min-height: 100vh;
}

.login-container,
.login-card,
.login-card input,
.login-card button,
.login-card a {
    font-family: 'IBM Plex Sans Thai', sans-serif;
}

.login-card label,
.login-card .form-text,
.login-card .form-control,
.login-card .btn,
.login-card .btn-social {
    font-weight: 500;
}

.login-card h1,
.login-card h2,
.login-card h3,
.login-card strong {
    font-family: Inter, 'IBM Plex Sans Thai', sans-serif;
}

/* ========================================
 * ANIMATED BACKGROUND (อัปเดตสีตามภาพ)
 * ======================================== */

.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    opacity: 0.08;
    animation: float 6s ease-in-out infinite;
}

.floating-shape:nth-child(1) {
    top: 10%;
    left: 10%;
    width: 80px;
    height: 80px;
    background: var(--mint-light);
    border-radius: 50%;
    animation-delay: 0s;
}

.floating-shape:nth-child(2) {
    top: 20%;
    right: 20%;
    width: 60px;
    height: 60px;
    background: var(--cream-yellow);
    border-radius: 50%;
    animation-delay: 2s;
}

.floating-shape:nth-child(3) {
    bottom: 20%;
    left: 20%;
    width: 100px;
    height: 100px;
    background: var(--mint-medium);
    border-radius: 30%;
    animation-delay: 4s;
}

.floating-shape:nth-child(4) {
    bottom: 30%;
    right: 10%;
    width: 70px;
    height: 70px;
    background: var(--teal-deep);
    border-radius: 50%;
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* ========================================
 * MAIN CONTAINER
 * ======================================== */

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

/* ========================================
 * CARD STYLING - ปรับให้เข้ากับโทนสีใหม่
 * ======================================== */

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(95, 179, 179, 0.2);
    border-radius: 1rem;
    box-shadow: 
        0 10px 30px rgba(95, 179, 179, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    overflow: hidden;
    width: 100%;
    max-width: 480px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 15px 40px rgba(95, 179, 179, 0.2),
        0 0 0 1px rgba(255, 255, 255, 0.15) inset;
}

/* ========================================
 * INPUT GROUP STYLING - อัปเดตสีใหม่
 * ======================================== */

.input-group-text {
    background: linear-gradient(135deg, var(--teal-deep) 0%, var(--mint-medium) 100%);
    color: white;
    border-color: var(--teal-deep);
    border-radius: 0.375rem 0 0 0.375rem !important;
    border-right: none;
}

.input-group .form-control {
    border-left-color: var(--teal-deep);
    border-radius: 0 0.375rem 0.375rem 0 !important;
}

.input-group .btn {
    border-radius: 0 0.375rem 0.375rem 0 !important;
    border-left: 1px solid #ced4da;
    border-color: var(--teal-deep);
}

/* สำหรับ input group ที่มี button toggle password */
.input-group .form-control:not(:last-child) {
    border-radius: 0 !important;
    border-right: none;
    border-color: var(--teal-deep);
}

.input-group .form-control + .btn {
    border-left: 1px solid var(--teal-deep);
    color: var(--teal-deep);
}

.input-group .form-control + .btn:hover {
    background-color: var(--mint-light);
    color: var(--teal-deep);
}

/* Keep Bootstrap input groups joined after the shared KU MOOC form styles. */
.login-form .input-group {
    display: flex;
    width: 100%;
    align-items: stretch;
}

.login-form .input-group > .input-group-text {
    flex: 0 0 44px;
    height: 44px;
    justify-content: center;
    padding: .625rem .75rem;
    border: 1px solid var(--teal-deep) !important;
    border-right: 0 !important;
    border-radius: .375rem 0 0 .375rem !important;
    background: var(--teal-deep) !important;
    color: #fff !important;
}

.login-form .input-group > .form-control {
    min-width: 0;
    flex: 1 1 auto;
    height: 44px;
    border-color: var(--teal-deep) !important;
    border-radius: 0 .375rem .375rem 0 !important;
}

.login-form .input-group > .form-control:not(:last-child) {
    border-radius: 0 !important;
}

.login-form .input-group > .btn {
    flex: 0 0 auto;
    height: 44px;
    border-radius: 0 .375rem .375rem 0 !important;
}

.login-form .invalid-feedback {
    margin-top: .375rem;
}

/* ========================================
 * BUTTON STYLING - โทนสีใหม่ตามภาพ
 * ======================================== */

/* ปุ่มเข้าสู่ระบบหลัก - ใช้ gradient ตามภาพ */
.btn-primary,
.btn-login {
    background: linear-gradient(135deg, var(--teal-deep) 0%, var(--mint-medium) 100%);
    border: none;
    color: white;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary::before,
.btn-login::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-primary:hover::before,
.btn-login:hover::before {
    left: 100%;
}

.btn-primary:hover,
.btn-login:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--teal-deep) 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(95, 179, 179, 0.3);
}

.btn-primary:focus,
.btn-login:focus {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--teal-deep) 100%);
    color: white;
    box-shadow: 0 0 0 0.2rem rgba(95, 179, 179, 0.25);
}

.btn-primary:active,
.btn-login:active {
    background: var(--primary-dark);
    color: white;
    transform: translateY(0);
}

.btn-primary:disabled,
.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--teal-deep);
    transform: none;
}

/* ========================================
 * SOCIAL LOGIN BUTTONS - อัปเดตสี
 * ======================================== */

.social-divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
    color: #6c757d;
}

.social-divider::before,
.social-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(95, 179, 179, 0.3), transparent);
}

.social-divider span {
    padding: 0 1rem;
    font-size: 0.875rem;
    color: var(--teal-deep);
    font-weight: 500;
}

.social-buttons {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.btn-social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    padding: 0.4rem;
    border-radius: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    flex: 1;
    min-width: 0;
}

.btn-social:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    text-decoration: none;
}

.btn-google {
    background: #fff;
    color: #db4437;
    border-color: #db4437;
}

.btn-facebook {
    background: #4267B2;
    color: white;
}

.btn-line {
    background: #06C755;
    color: white;
}

.btn-ku {
    background: linear-gradient(135deg, var(--teal-deep) 0%, var(--mint-medium) 100%);
    color: white;
    border: 1px solid var(--teal-deep);
}

.btn-ku:hover {
    background: linear-gradient(135deg, var(--mint-medium) 0%, var(--mint-light) 100%);
    color: var(--teal-deep);
}

/* ========================================
 * SUCCESS BUTTON STATE - โทนเขียวใหม่
 * ======================================== */

.btn-success {
    background: linear-gradient(135deg, var(--mint-medium) 0%, var(--mint-light) 100%);
    border: none;
    color: var(--teal-deep);
    font-weight: 600;
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--mint-light) 0%, var(--cream-yellow) 100%);
    color: var(--teal-deep);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(136, 201, 153, 0.3);
}

.btn-success:focus {
    box-shadow: 0 0 0 0.2rem rgba(136, 201, 153, 0.25);
}

/* ========================================
 * FOOTER STYLING - อัปเดตสี
 * ======================================== */

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--teal-deep);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--teal-deep), var(--mint-medium));
    transition: width 0.3s ease;
}

.footer-links a:hover {
    color: var(--mint-medium);
}

.footer-links a:hover::after {
    width: 100%;
}

/* ========================================
 * FOCUS STYLES - อัปเดตสีใหม่
 * ======================================== */

.form-control:focus {
    border-color: var(--teal-deep);
    box-shadow: 0 0 0 0.2rem rgba(95, 179, 179, 0.25);
}

.btn:focus {
    box-shadow: 0 0 0 0.2rem rgba(95, 179, 179, 0.25);
}

/* ========================================
 * PRIMARY BUTTON
 * ======================================== */

.btn-primary {
    --bs-btn-bg: var(--teal-deep);
    --bs-btn-border-color: var(--teal-deep);
    --bs-btn-hover-bg: var(--primary-dark);
    --bs-btn-hover-border-color: var(--primary-dark);
    --bs-btn-focus-shadow-rgb: 95, 179, 179;
    --bs-btn-active-bg: var(--primary-dark);
    --bs-btn-active-border-color: var(--primary-dark);
    --bs-btn-disabled-bg: var(--teal-deep);
    --bs-btn-disabled-border-color: var(--teal-deep);
}

/* ========================================
 * ALERTS - อัปเดตสีตามโทนใหม่
 * ======================================== */

.alert-info {
    background-color: rgba(184, 230, 193, 0.1);
    border-color: var(--mint-light);
    color: var(--teal-deep);
}

.alert-success {
    background-color: rgba(136, 201, 153, 0.1);
    border-color: var(--mint-medium);
    color: var(--teal-deep);
}

.alert-warning {
    background-color: rgba(240, 230, 166, 0.1);
    border-color: var(--cream-yellow);
    color: #b8860b;
}

/* ========================================
 * LOADING STATE WITH NEW COLORS
 * ======================================== */

.btn-loading .btn-text {
    display: none;
}

.btn-loading .btn-loading {
    display: inline-block !important;
}

.btn-loading {
    background: linear-gradient(135deg, var(--teal-deep) 0%, var(--mint-medium) 50%, var(--mint-light) 100%) !important;
    opacity: 0.8;
    animation: loadingShimmer 2s infinite;
}

@keyframes loadingShimmer {
    0% { opacity: 0.8; }
    50% { opacity: 1; }
    100% { opacity: 0.8; }
}

/* ========================================
 * RESPONSIVE DESIGN
 * ======================================== */

@media (max-width: 575.98px) {
    .login-container {
        min-height: 100dvh;
        padding: 1rem 0.75rem;
        align-items: flex-start;
    }

    .login-card {
        margin: 0;
        border-radius: 25px;
        min-height: auto;
    }

    .login-form {
        padding: 1.5rem !important;
    }

    .login-form form > .text-center img {
        width: 96px !important;
        height: 96px;
        object-fit: contain;
    }

    .social-buttons {
        flex-direction: column;
    }

    .btn-social {
        flex: none;
        width: 100%;
    }

    .footer-links {
        flex-direction: column;
        gap: 0.75rem;
    }
}

/* ========================================
 * ACCESSIBILITY & ANIMATIONS
 * ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.keyboard-navigation *:focus {
    outline: 2px solid var(--teal-deep) !important;
    outline-offset: 2px !important;
}

/* ========================================
 * VALIDATION ANIMATIONS 
 * ======================================== */

.was-validated .form-control:invalid {
    animation: shake 0.5s ease-in-out;
    border-color: #dc3545;
}

.was-validated .form-control:valid {
    border-color: var(--mint-medium);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* ========================================
 * ADDITIONAL ENHANCEMENTS
 * ======================================== */

/* Card glassmorphism effect */
.login-card {
    backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Input focus glow effect */
.form-control:focus {
    box-shadow: 
        0 0 0 0.2rem rgba(95, 179, 179, 0.25),
        0 0 20px rgba(95, 179, 179, 0.1);
}

/* Button success animation */
.btn-success-state {
    background: linear-gradient(135deg, var(--mint-medium) 0%, var(--mint-light) 100%) !important;
    color: var(--teal-deep) !important;
    animation: successPulse 0.6s ease;
}

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