/* 1. Impor Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* 2. Variabel CSS (Palet Warna) */
:root {
    /* Light Mode */
    --bg-color: #f0f2f5;
    --container-bg: rgba(255, 255, 255, 0.9);
    --border-color: rgba(222, 226, 230, 0.7);
    --text-color: #343a40;
    --text-light: #6c757d;
    --shadow-base: 0 8px 32px rgba(0, 0, 0, 0.08);
    --blur-strength: 10px;
    --input-bg: rgba(0, 0, 0, 0.03);

    /* Warna Kategori */
    --color-default: #dee2e6;
    --color-underweight: #007aff; /* Biru */
    --color-normal: #34c759; /* Hijau */
    --color-overweight: #ff9500; /* Oranye */
    --color-obese: #ff3b30; /* Merah */
}

/* Dark Mode (Class 'dark-mode' pada body) */
body.dark-mode {
    --bg-color: #1c1c1e;
    --container-bg: rgba(28, 28, 30, 0.8);
    --border-color: rgba(60, 60, 67, 0.7);
    --text-color: #f2f2f7;
    --text-light: #8e8e93;
    --shadow-base: 0 8px 32px rgba(0, 0, 0, 0.3);
    --input-bg: rgba(255, 255, 255, 0.08);

    /* Warna Kategori Dark */
    --color-default: #3a3a3c;
    --color-underweight: #0a84ff;
    --color-normal: #30d158;
    --color-overweight: #ff9f0a;
    --color-obese: #ff453a;
}

/* 3. Reset dasar dan gaya body */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 25px 15px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 4. Kontainer utama (Glassmorphism) */
.container {
    width: 100%;
    max-width: 650px; /* Lebih lebar untuk layout 2 kolom */
    background: var(--container-bg);
    border-radius: 20px;
    box-shadow: var(--shadow-base);
    padding: 35px;
    backdrop-filter: blur(var(--blur-strength));
    -webkit-backdrop-filter: blur(var(--blur-strength));
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
    position: relative; /* Untuk tombol dark mode */
}

/* 5. Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
    color: var(--text-color);
}

header p {
    font-size: 16px;
    color: var(--text-light);
    font-weight: 500;
}

/* 6. Layout Kalkulator (2 Kolom) */
.calculator-body {
    display: flex;
    gap: 30px;
    align-items: center;
}

.input-side {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.result-side {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

/* 7. Grup Input */
.input-group label {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 10px;
}

.input-group input {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 17px;
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    background-color: var(--input-bg);
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.input-group input:focus {
    border-color: var(--color-underweight); /* Apple Blue */
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.2);
}

/* 8. Tampilan Hasil (Gauge) */
#bmi-gauge {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 10px solid var(--color-default); /* Warna default */
    margin-bottom: 20px;
    transition: border-color 0.5s ease;
}

#bmi-score {
    font-size: 44px;
    font-weight: 700;
    color: var(--text-color);
}

#bmi-category {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-color);
    transition: color 0.5s ease;
    margin-bottom: 8px;
}

#bmi-info {
    font-size: 14px;
    color: var(--text-light);
    max-width: 250px;
}

/* 9. Kelas Kategori (Untuk JS) */
.gauge-default { border-color: var(--color-default); }
.text-default { color: var(--text-light); }

.gauge-underweight { border-color: var(--color-underweight); }
.text-underweight { color: var(--color-underweight); }

.gauge-normal { border-color: var(--color-normal); }
.text-normal { color: var(--color-normal); }

.gauge-overweight { border-color: var(--color-overweight); }
.text-overweight { color: var(--color-overweight); }

.gauge-obese { border-color: var(--color-obese); }
.text-obese { color: var(--color-obese); }


/* 10. Tombol Dark Mode (Sama seperti To-Do) */
#dark-mode-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.secondary-btn {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.secondary-btn:hover {
    background-color: var(--border-color);
}

/* 11. Responsif */
@media (max-width: 600px) {
    .container {
        padding: 25px;
    }
    .calculator-body {
        flex-direction: column; /* Ubah jadi 1 kolom */
        gap: 35px;
    }
    header h1 {
        font-size: 26px;
    }
    .input-side {
        width: 100%;
    }
    #bmi-gauge {
        width: 140px;
        height: 140px;
    }
    #bmi-score {
        font-size: 38px;
    }
    #dark-mode-toggle {
        top: 15px;
        right: 15px;
    }
}