/* ===================================================================
   CallStudent — หน้า Login Premium
   Glassmorphism + Animated Gradient + Floating Labels
   =================================================================== */

/* พื้นหลัง Animated Gradient Mesh */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0D47A1 0%, #1565C0 25%, #42A5F5 50%, #1976D2 75%, #0D47A1 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

/* เอฟเฟค Mesh พื้นหลัง */
.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 20% 50%, rgba(66, 165, 245, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(13, 71, 161, 0.4) 0%, transparent 50%),
                radial-gradient(circle at 50% 80%, rgba(3, 155, 229, 0.25) 0%, transparent 50%);
    animation: meshFloat 20s ease-in-out infinite;
}

/* วงกลมตกแต่งลอยได้ */
.login-page::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    top: 10%;
    right: -100px;
    animation: floatBubble 8s ease-in-out infinite;
}

/* การ์ด Login — Glassmorphism */
.login-card {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15),
                0 2px 8px rgba(0, 0, 0, 0.05);
    padding: 48px 40px;
    animation: cardAppear 0.6s cubic-bezier(.4, 0, .2, 1);
}

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

.login-logo {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 4px 16px rgba(21, 101, 192, 0.35);
    animation: logoPulse 3s ease-in-out infinite;
}

.login-logo i {
    font-size: 32px;
    color: #fff;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.login-header p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

/* Floating Label Input Group */
.login-input-group {
    position: relative;
    margin-bottom: 24px;
}

.login-input-group .input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 16px;
    transition: var(--transition);
    z-index: 2;
}

.login-input {
    width: 100%;
    padding: 16px 16px 16px 48px;
    font-family: var(--font-family);
    font-size: var(--font-base);
    color: var(--text-primary);
    background: rgba(240, 244, 248, 0.6);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    outline: none;
}

.login-input:focus {
    background: var(--bg-surface);
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px rgba(66, 165, 245, 0.12);
}

.login-input:focus ~ .input-icon {
    color: var(--primary);
}

.login-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

/* ปุ่มแสดง/ซ่อนรหัสผ่าน */
.password-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 16px;
    padding: 4px;
    transition: var(--transition);
    z-index: 2;
}

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

/* ปุ่ม Login */
.login-btn {
    width: 100%;
    padding: 16px;
    font-family: var(--font-family);
    font-size: var(--font-md);
    font-weight: 600;
    color: #fff;
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 16px rgba(21, 101, 192, 0.35);
    margin-top: 8px;
}

.login-btn:hover {
    background: var(--primary-gradient-hover);
    box-shadow: 0 6px 24px rgba(21, 101, 192, 0.45);
    transform: translateY(-2px);
}

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

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* ปุ่ม Loading Spinner */
.login-btn .login-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

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

/* ข้อความ Error */
.login-error {
    display: none;
    padding: 12px 16px;
    background: var(--danger-light);
    color: var(--danger);
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    font-weight: 500;
    margin-bottom: 20px;
    animation: fadeInDown 0.3s ease;
}

.login-error.show {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Footer */
.login-footer {
    text-align: center;
    margin-top: 32px;
    font-size: var(--font-xs);
    color: var(--text-muted);
}

/* ===================================================================
   Animations
   =================================================================== */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes meshFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, 3%) rotate(1deg); }
    66% { transform: translate(-1%, -2%) rotate(-1deg); }
}

@keyframes floatBubble {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-30px) scale(1.05); }
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes logoPulse {
    0%, 100% { box-shadow: 0 4px 16px rgba(21, 101, 192, 0.35); }
    50% { box-shadow: 0 4px 24px rgba(21, 101, 192, 0.55); }
}

/* ===================================================================
   Responsive
   =================================================================== */
@media (max-width: 480px) {
    .login-card {
        padding: 36px 24px;
        border-radius: 20px;
    }

    .login-header h1 {
        font-size: 1.5rem;
    }

    .login-logo {
        width: 60px;
        height: 60px;
        border-radius: 16px;
    }

    .login-logo i {
        font-size: 26px;
    }
}