/* =========================================
   UI 主題：活力柯基 (Energetic Corgi) - Login Page
   ========================================= */
body {
    background-color: #F0F7FF;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 上方活潑的弧形背景區 */
.mascot-header {
    background: linear-gradient(135deg, #FFC107, #FF9800);
    padding: 40px 20px 80px;
    text-align: center;
    border-bottom-left-radius: 50% 20%;
    border-bottom-right-radius: 50% 20%;
    position: relative;
}

.mascot-img {
    width: 180px;
    height: auto;
    filter: drop-shadow(0 10px 15px rgba(0, 0, 0, 0.15));
    transition: transform 0.3s;
}

.mascot-img:hover {
    transform: scale(1.1) rotate(5deg);
}

.login-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    margin-top: -60px;
}

.login-card {
    width: 100%;
    max-width: 400px;
    border-radius: 24px;
    border: none;
    background: #FFFFFF;
    box-shadow: 0 15px 35px rgba(30, 58, 138, 0.12);
    padding: 40px;
    position: relative;
}

.form-control {
    border-radius: 12px;
    background-color: #F8FAFC;
    border: 2px solid #E2E8F0;
    padding: 12px 16px;
    color: #475569;
    transition: all 0.3s;
}

.form-control:focus {
    background-color: #fff;
    border-color: #FF9800;
    box-shadow: 0 0 0 4px rgba(255, 152, 0, 0.15);
}

.btn-login {
    border-radius: 12px;
    background: linear-gradient(145deg, #3B82F6, #2563EB);
    color: #fff;
    font-weight: 700;
    padding: 14px;
    font-size: 1.1rem;
    border: none;
    width: 100%;
    margin-top: 25px;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
    transition: transform 0.2s;
}

.btn-login:hover {
    background: linear-gradient(145deg, #2563EB, #1D4ED8);
    transform: translateY(-2px);
}

.brand-title {
    font-weight: 800;
    color: #1E293B;
    letter-spacing: 1px;
}

/* =========================================
   RWD 響應式設計
   ========================================= */

/* 小型手機 (< 375px) */
@media (max-width: 374px) {
    .mascot-header {
        padding: 25px 15px 50px;
    }

    .mascot-img {
        width: 100px;
    }

    .mascot-header h4 {
        font-size: 1.1rem;
    }

    .login-container {
        margin-top: -40px;
        padding: 15px;
    }

    .login-card {
        padding: 24px 20px;
        border-radius: 20px;
    }

    .form-control {
        padding: 10px 14px;
        font-size: 16px;
    }

    .btn-login {
        padding: 12px;
        font-size: 1rem;
    }

    .brand-title {
        font-size: 1.1rem;
    }
}

/* 標準手機 (375-576px) */
@media (min-width: 375px) and (max-width: 576px) {
    .mascot-header {
        padding: 30px 20px 60px;
    }

    .mascot-img {
        width: 130px;
    }

    .login-container {
        margin-top: -50px;
        padding: 20px;
    }

    .login-card {
        padding: 30px 24px;
    }

    .form-control {
        font-size: 16px;
    }
}

/* 大型手機 & 小平板 (577-768px) */
@media (min-width: 577px) and (max-width: 768px) {
    .login-card {
        max-width: 420px;
    }

    .mascot-img {
        width: 160px;
    }
}

/* 平板 (769-1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .mascot-header {
        padding: 50px 20px 90px;
    }

    .mascot-img {
        width: 200px;
    }

    .login-card {
        max-width: 450px;
        padding: 45px;
    }
}

/* 桌面/寬螢幕 (≥1025px) */
@media (min-width: 1025px) {
    .mascot-header {
        padding: 60px 20px 100px;
    }

    .mascot-img {
        width: 220px;
    }

    .login-card {
        max-width: 480px;
        padding: 50px;
        box-shadow: 0 20px 50px rgba(30, 58, 138, 0.15);
    }

    .btn-login {
        padding: 16px;
        font-size: 1.15rem;
    }
}