/* 
  Main Project Styles
  BYTEMALTE Design System v1.1
*/

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

:root {
    --color-primary: #8888FF;
    --color-secondary: #3DDC84;
    --color-background: #0F172A;
    --color-surface: #1E293B;
    --color-text-high: #F8FAFC;
    --color-text-muted: #B0BDD0;
    --color-error: #EF4444;
    --color-border: #334155;

    --radius-btn: 8px;
    --radius-card: 16px;
    --radius-input: 8px;

    --font-family: 'Inter', system-ui, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-background);
    color: var(--color-text-high);
    font-family: var(--font-family);
    font-weight: 400;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px;
}

.calculator-wrap {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 24px;
    width: 100%;
    max-width: 360px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.display-area {
    background-color: var(--color-background);
    border-radius: var(--radius-input);
    padding: 24px;
    text-align: right;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    overflow: hidden;
}

.display-text {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-high);
    white-space: nowrap;
}

.operator-symbol {
    color: var(--color-primary);
    font-weight: 600;
    margin: 0 4px;
}

.keypad-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.calc-btn {
    border: none;
    outline: none;
    font-size: 1.25rem;
    font-weight: 500;
    padding: 18px 0;
    border-radius: var(--radius-btn);
    cursor: pointer;
    transition: filter 0.2s, box-shadow 0.2s, transform 0.1s;
    color: var(--color-text-high);
}

.calc-btn:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.calc-btn:active {
    transform: scale(0.98);
}

.btn-number {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
}

.btn-operator {
    background-color: var(--color-primary);
    color: var(--color-text-high);
}

.btn-clear {
    background-color: var(--color-error);
    color: var(--color-text-high);
}

.btn-equals {
    grid-column: span 4;
    background-color: var(--color-secondary);
    color: var(--color-background);
    font-weight: 600;
    margin-top: 8px;
}

.btn-zero {
    grid-column: span 2;
    text-align: left;
    padding-left: 24px;
}

@media (max-height: 700px) {
    .calculator-wrap {
        padding: 16px;
        gap: 12px;
    }

    .calc-btn {
        padding: 14px 0;
        font-size: 1.1rem;
    }

    .display-text {
        font-size: 2rem;
    }
}