/* ===== Загальні налаштування ===== */

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

::selection {
    background-color: #39ff14;
    color: #0d1a0d;
}

::-moz-selection {
    background-color: #39ff14;
    color: #0d1a0d;
}

body {
    overflow: hidden;
    /* Темний фон на весь екран */
    background-color: #000000;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Share Tech Mono', 'Courier New', monospace;
    padding: 1.0417vw;
}

/* ===== Корпус Pip-Boy ===== */

.pip-boy {
    position: relative;
    z-index: 2;
    background-color: #272626;
    border: 0.1876vw solid #386438;
    border-radius: 0.375vw;
    padding: 1.5625vw;
    width: 23.75vw;

    /* Зелене світіння навколо калькулятора */
    box-shadow:
        0 0 1.25vw rgba(57, 255, 20, 0.3),
        0 0 3.75vw rgba(57, 255, 20, 0.15),
        inset 0 0 1.875vw rgba(0, 0, 0, 0.5);
}

/* ===== Заголовок ===== */

.pip-header {
    text-align: center;
    margin-bottom: 1.25vw;
    color: #39ff14;
    text-shadow: 0 0 0.625vw rgba(57, 255, 20, 0.8);
}

.pip-header h1 {
    font-size: 1.2vw;
    letter-spacing: 0.1876vw;
}

.subtitle {
    font-size: 0.75vw;
    color: #2ecc40;
    margin-top: 0.3125vw;
    opacity: 0.8;
}

/* ===== Екран калькулятора ===== */

.screen {
    background-color: #0d1a0d;
    border: 0.125vw solid #39ff14;
    border-radius: 0.25vw;
    padding: 0.9375vw;
    margin-bottom: 1.25vw;
    min-height: 4.375vw;
    display: flex;
    align-items: center;
    justify-content: flex-end;

    /* Ефект мерехтіння екрану */
    animation: screenFlicker 4s infinite;

    box-shadow:
        inset 0 0 1.25vw rgba(57, 255, 20, 0.1),
        0 0 0.9375vw rgba(57, 255, 20, 0.2);
}

.display-text {
    color: #39ff14;
    font-size: 2vw;
    text-align: right;
    width: 100%;
    word-break: break-all;
    text-shadow: 0 0 0.5vw rgba(57, 255, 20, 0.6);

    /* Легкі смуги як на старому моніторі */
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 0.125vw,
        rgba(0, 0, 0, 0.1) 0.125vw,
        rgba(0, 0, 0, 0.1) 0.25vw
    );
}

/* Клас для показу помилки (червоний текст) */
.display-text.error {
    color: #ff4444;
    text-shadow: 0 0 0.5vw rgba(255, 68, 68, 0.6);
}

/* ===== Сітка кнопок ===== */

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.625vw;
    -webkit-user-select: none;
    user-select: none;
}

/* ===== Стиль кнопок (старий пристрій після апокаліпсису) ===== */

.btn {
    font-family: 'Share Tech Mono', 'Courier New', monospace;
    font-size: 1.3vw;
    padding: 1.125vw 0.625vw;
    border: 0.125vw solid #3a5a3a;
    border-radius: 0.25vw;
    cursor: pointer;
    color: #39ff14;
    background: linear-gradient(180deg, #2a3a2a 0%, #1a2a1a 100%);
    text-shadow: 0 0 0.3125vw rgba(57, 255, 20, 0.5);
    transition: all 0.1s ease;
    -webkit-user-select: none;
    user-select: none;

    /* Ефект потертості / старого металу */
    box-shadow:
        inset 0 0.0625vw 0 rgba(57, 255, 20, 0.2),
        0 0.1875vw 0 #0a1a0a,
        0 0.25vw 0.5vw rgba(0, 0, 0, 0.5);
}

.btn:hover {
    background: linear-gradient(180deg, #3a4a3a 0%, #2a3a2a 100%);
    box-shadow:
        inset 0 0.0625vw 0 rgba(57, 255, 20, 0.4),
        0 0.1875vw 0 #0a1a0a,
        0 0 0.9375vw rgba(57, 255, 20, 0.3);
}

.btn:active {
    transform: translateY(0.125vw);
    box-shadow:
        inset 0 0.125vw 0.3125vw rgba(0, 0, 0, 0.5),
        0 0.0625vw 0 #0a1a0a;
}

/* Кнопка очищення */
.btn-clear {
    color: #d12e2e;
    border-color: #241818;
    background: linear-gradient(180deg, #3a2a2a 0%, #2a1a1a 100%);
    text-shadow: 0 0 0.3125vw rgba(255, 107, 107, 0.5);
}

.btn-clear:hover {
    background: linear-gradient(180deg, #4a3a3a 0%, #3a2a2a 100%);
    box-shadow:
        inset 0 0.0625vw 0 rgba(255, 107, 107, 0.3),
        0 0.1875vw 0 #0a1a0a,
        0 0 0.9375vw rgba(255, 107, 107, 0.3);
}

/* Кнопка дорівнює */
.btn-equals {
    grid-row: span 2;
    background: linear-gradient(180deg, #2a4a2a 0%, #1a3a1a 100%);
    font-size: 1.5vw;
}

/* Нуль займає два стовпці */
.btn-zero {
    grid-column: span 2;
    text-align: center;
}

/* ===== Підвал ===== */

.pip-footer {
    text-align: center;
    margin-top: 1.25vw;
    color: #2ecc40;
    font-size: 0.8vw;
    opacity: 0.7;
}

/* ===== Титул проєкту ===== */

.project-title {
    position: fixed;
    top: 1.0417vw;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
    pointer-events: auto;
}

.project-title__badge {
    display: inline-block;
    font-size: 0.875vw;
    letter-spacing: 0.2917vw;
    color: #0d1a0d;
    background-color: #39ff14;
    padding: 0.2917vw 0.7292vw;
    border-radius: 0.1458vw;
    text-transform: uppercase;
    box-shadow: 0 0 0.7292vw rgba(57, 255, 20, 0.5);
}

.project-title__name {
    margin-top: 0.5833vw;
    font-size: 1.3125vw;
    letter-spacing: 0.2188vw;
    color: #39ff14;
    text-shadow: 0 0 0.7292vw rgba(57, 255, 20, 0.7);
}

/* ===== Віджет дати ===== */

.date-widget {
    position: fixed;
    top: 1.0417vw;
    right: 1.0417vw;
    z-index: 10;
    pointer-events: auto;
    min-width: 9.375vw;
    padding: 0.625vw 0.7813vw;
    background-color: #0d1a0d;
    border: 0.1042vw solid #39ff14;
    border-radius: 0.2083vw;
    box-shadow:
        inset 0 0 0.625vw rgba(57, 255, 20, 0.08),
        0 0 0.7813vw rgba(57, 255, 20, 0.2);
}

.date-widget__label {
    font-size: 0.5208vw;
    letter-spacing: 0.1563vw;
    color: #2ecc40;
    opacity: 0.85;
    margin-bottom: 0.3125vw;
}

.date-widget__value {
    font-size: 0.7292vw;
    line-height: 1.4;
    color: #39ff14;
    text-shadow: 0 0 0.3125vw rgba(57, 255, 20, 0.5);
}

/* ===== Кредити автора ===== */

.page-credits {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 1.0417vw;
    text-align: center;
    color: #2ecc40;
    opacity: 0.55;
    z-index: 10;
    pointer-events: auto;
}

.page-credits__author {
    font-size: 0.7292vw;
    letter-spacing: 0.1042vw;
    text-shadow: 0 0 0.3125vw rgba(57, 255, 20, 0.4);
}

.page-credits__name {
    color: #39ff14;
    text-shadow: 0 0 0.4167vw rgba(57, 255, 20, 0.6);
}

/* Мигаючий курсор */
.blink {
    animation: blink 2s step-end infinite;
}

/* ===== Анімації ===== */

/* Мерехтіння екрану */
@keyframes screenFlicker {
    0%, 100% { opacity: 1; }
    92% { opacity: 1; }
    93% { opacity: 0.85; }
    94% { opacity: 1; }
    96% { opacity: 0.9; }
    97% { opacity: 1; }
}

/* Мигання курсора */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.decor-img {
    pointer-events: none;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: -1;
    -webkit-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
}

.unselectable {
    -webkit-user-select: none;
    user-select: none;
}

.undraggable {
    -webkit-user-drag: none;
}

.pip-boy-img {
    width: 50vw;
    left: -7vw;
}

.tower-img {
    width: 35vw;
    top: 55%;
    right: 0;
}

@media (max-width: 767px) {

    .pip-boy-img, .tower-img {
        display: none;
    }

    body {
        overflow: auto;
        padding: 4.0712vw;
        align-items: flex-start;
        padding-top: 6.3613vw;
    }

    .pip-boy {
        border-width: 0.7634vw;
        border-radius: 1.5267vw;
        padding: 6.3613vw;
        width: 94.6565vw;
        margin-top: 6.6158vw;
        box-shadow:
            0 0 5.0891vw rgba(57, 255, 20, 0.25),
            0 0 15.2672vw rgba(57, 255, 20, 0.1),
            inset 0 0 7.6336vw rgba(0, 0, 0, 0.5);
    }

    .pip-header {
        margin-bottom: 5.0891vw;
        text-shadow: 0 0 2.5445vw rgba(57, 255, 20, 0.8);
    }

    .pip-header h1 {
        font-size: 4.0712vw;
        letter-spacing: 0.7634vw;
    }

    .subtitle {
        margin-top: 1.2723vw;
        font-size: 2.8499vw;
    }

    .screen {
        border-width: 0.509vw;
        border-radius: 1.0183vw;
        padding: 3.8168vw;
        margin-bottom: 5.0891vw;
        min-height: 17.8117vw;
        box-shadow:
            inset 0 0 5.0891vw rgba(57, 255, 20, 0.1),
            0 0 3.8168vw rgba(57, 255, 20, 0.2);
    }

    .display-text {
        font-size: 6.514vw;
        text-shadow: 0 0 2.0369vw rgba(57, 255, 20, 0.6);
        background: repeating-linear-gradient(
            0deg,
            transparent,
            transparent 0.509vw,
            rgba(0, 0, 0, 0.1) 0.509vw,
            rgba(0, 0, 0, 0.1) 1.0183vw
        );
    }

    .display-text.error {
        text-shadow: 0 0 2.0369vw rgba(255, 68, 68, 0.6);
    }

    .buttons {
        gap: 2.5445vw;
    }

    .btn {
        font-size: 4.6819vw;
        padding: 5.597vw 2.5445vw;
        border-width: 0.509vw;
        border-radius: 1.0183vw;
        text-shadow: 0 0 1.2723vw rgba(57, 255, 20, 0.5);
        box-shadow:
            inset 0 0.2545vw 0 rgba(57, 255, 20, 0.2),
            0 0.7634vw 0 #0a1a0a,
            0 1.0183vw 2.0369vw rgba(0, 0, 0, 0.5);
    }

    .btn:hover {
        box-shadow:
            inset 0 0.2545vw 0 rgba(57, 255, 20, 0.4),
            0 0.7634vw 0 #0a1a0a,
            0 0 3.8168vw rgba(57, 255, 20, 0.3);
    }

    .btn:active {
        transform: translateY(0.509vw);
        box-shadow:
            inset 0 0.509vw 1.2723vw rgba(0, 0, 0, 0.5),
            0 0.2545vw 0 #0a1a0a;
    }

    .btn-clear {
        text-shadow: 0 0 1.2723vw rgba(255, 107, 107, 0.5);
    }

    .btn-clear:hover {
        box-shadow:
            inset 0 0.2545vw 0 rgba(255, 107, 107, 0.3),
            0 0.7634vw 0 #0a1a0a,
            0 0 3.8168vw rgba(255, 107, 107, 0.3);
    }

    .btn-equals {
        font-size: 5.4962vw;
    }

    .pip-footer {
        margin-top: 5.0891vw;
        font-size: 3.0534vw;
    }

    .page-credits {
        bottom: 4.0712vw;
        opacity: 0.65;
    }

    .page-credits__author {
        font-size: 3.5623vw;
        letter-spacing: 0.509vw;
        text-shadow: 0 0 1.2723vw rgba(57, 255, 20, 0.4);
    }

    .page-credits__name {
        text-shadow: 0 0 1.5267vw rgba(57, 255, 20, 0.6);
    }

    .project-title {
        top: 4.0712vw;
        width: calc(100% - 8.1424vw);
    }

    .project-title__badge {
        font-size: 3.5623vw;
        letter-spacing: 1.0688vw;
        padding: 1.0688vw 3.5623vw;
        border-radius: 0.7126vw;
        box-shadow: 0 0 3.5623vw rgba(57, 255, 20, 0.5);
    }

    .project-title__name {
        display: none;
        margin-top: 2.1374vw;
        font-size: 4.9872vw;
        letter-spacing: 0.7126vw;
        text-shadow: 0 0 3.5623vw rgba(57, 255, 20, 0.7);
    }

    .date-widget {
        display: none;
        top: 4.0712vw;
        right: 4.0712vw;
        min-width: 30.5344vw;
        padding: 2.5445vw 3.0534vw;
        border-width: 0.509vw;
        border-radius: 1.0183vw;
        box-shadow:
            inset 0 0 3.0534vw rgba(57, 255, 20, 0.08),
            0 0 3.8168vw rgba(57, 255, 20, 0.2);
    }

    .date-widget__label {
        font-size: 2.5445vw;
        letter-spacing: 0.7634vw;
        margin-bottom: 1.5267vw;
    }

    .date-widget__value {
        font-size: 3.5623vw;
        text-shadow: 0 0 1.5267vw rgba(57, 255, 20, 0.5);
    }

    .pip-boy-img {
        width: 101.7812vw;
        top: auto;
        bottom: -5.0891vw;
        left: 50%;
        transform: translateX(-50%);
        opacity: 0.35;
    }
}