:root {
    --ios-bg: #F2F2F7;
    --ios-card: #FFFFFF;
    --ios-blue: #007AFF;
    --ios-text: #000000;
    --ios-gray: #8E8E93;
    --ios-divider: #C6C6C8;
}

@media (prefers-color-scheme: dark) {
    :root {
        --ios-bg: #000000;
        --ios-card: #1C1C1E;
        --ios-blue: #0A84FF;
        --ios-text: #FFFFFF;
        --ios-gray: #8E8E93;
        --ios-divider: #38383A;
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
}

body {
    background-color: var(--ios-bg);
    color: var(--ios-text);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    min-height: 100dvh;
}

.container {
    padding: env(safe-area-inset-top, 20px) 20px calc(env(safe-area-inset-bottom, 20px) + 20px);
    max-width: 400px;
    margin: 0 auto;
}

header {
    margin: 40px 0 20px 0;
}

header h1 {
    font-size: 34px;
    font-weight: 700;
    letter-spacing: 0.3px;
}

header p {
    color: var(--ios-gray);
    font-size: 15px;
    margin-top: 5px;
}

.card {
    background-color: var(--ios-card);
    border-radius: 14px;
    margin-bottom: 20px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.input-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.input-group label {
    font-size: 17px;
    font-weight: 400;
}

.input-group input {
    text-align: right;
    font-size: 17px;
    border: none;
    outline: none;
    background: transparent;
    color: var(--ios-blue);
    width: 50%;
}

.input-group input::placeholder {
    color: var(--ios-gray);
}

.divider {
    height: 1px;
    background-color: var(--ios-divider);
    margin-left: 20px;
}

.ios-button {
    width: 100%;
    background-color: var(--ios-blue);
    color: white;
    border: none;
    padding: 16px;
    font-size: 17px;
    font-weight: 600;
    border-radius: 14px;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

.ios-button:active {
    opacity: 0.7;
    transform: scale(0.98);
}

.resultado-card {
    margin-top: 30px;
    background-color: var(--ios-card);
    border-radius: 14px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.resultado-card.hidden {
    display: none;
}

.resultado-card.show {
    opacity: 1;
    transform: translateY(0);
}

#imc-valor {
    font-size: 48px;
    font-weight: 700;
    color: var(--ios-blue);
}

#imc-diagnostico {
    font-size: 20px;
    font-weight: 500;
    margin-top: 5px;
}

.nota-medica {
    margin-top: 15px;
    font-size: 12px;
    color: var(--ios-gray);
    text-align: justify;
    line-height: 1.4;
}