/* ==========================================================================
   Variáveis do Teclado
   ========================================================================== */
:root {
    --keyboard-gap: clamp(1px, 0.2vw, 3px);
    --key-base-size: clamp(24px, 2.5vw, 32px);
    --key-radius: 4px;
    --keyboard-bg: transparent;
    --keyboard-padding: clamp(4px, 1vw, 8px);
    --key-transition: all 0.2s ease-out;
    --keyboard-max-width: 100%;
}

/* ==========================================================================
   Container Principal do Teclado
   ========================================================================== */
.keyboard {
    display: flex;
    flex-direction: column;
    gap: var(--keyboard-gap);
    width: 100%;
    max-width: var(--keyboard-max-width);
    margin: 0 auto;
    padding: var(--keyboard-padding);
    background: var(--keyboard-bg);
    border-radius: var(--key-radius);
    transition: var(--key-transition);
}

.keyboard-wrapper {
    padding: 0 0.5rem;
    margin: 0 auto;
    width: 100%;
    max-width: 650px;
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: var(--keyboard-gap);
    margin: 0 auto;
    width: fit-content;
    flex-wrap: nowrap;
}

/* ==========================================================================
   Estilização das Teclas
   ========================================================================== */
.key {
    width: var(--key-base-size);
    height: var(--key-base-size);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-light);
    border: 1px solid var(--accent-light);
    border-radius: var(--key-radius);
    cursor: pointer;
    transition: var(--key-transition);
    color: var(--primary-dark);
    font-size: 0.8em;
    padding: 0;
    margin: 0;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
}

.key:hover {
    background-color: var(--accent-light);
    transform: translateY(-1px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.key:active {
    transform: translateY(0);
    box-shadow: none;
}

/* ==========================================================================
   Teclas Especiais
   ========================================================================== */
.key.caps,
.key.shift,
.key.apagar,
.key.limpar,
.key.espaco {
    font-size: 0.75em;
    font-weight: bold;
}

.key.caps { width: clamp(40px, 5vw, 50px); }
.key.shift { width: clamp(45px, 5.5vw, 55px); }
.key.apagar { 
    width: clamp(42px, 5vw, 52px);
    background-color: #ff6b6b;
    color: white;
}
.key.limpar { 
    width: clamp(42px, 5vw, 52px);
    background-color: #ff9f43;
    color: white;
}
.key.espaco { 
    width: clamp(80px, 10vw, 100px);
}

/* ==========================================================================
   Elementos do Teclado
   ========================================================================== */
.key-content {
    pointer-events: none;
    text-align: center;
    width: 100%;
}

.letter {
    font-weight: bold;
}

/* ==========================================================================
   Estados e Animações
   ========================================================================== */
.key.caps.active,
.key.shift.active {
    background-color: var(--accent-dark);
    color: var(--primary-light);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
}

@keyframes keyPress {
    0% { transform: scale(1); }
    50% { transform: scale(0.95); }
    100% { transform: scale(1); }
}

.key:active {
    animation: keyPress 0.15s ease-out;
}

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media (max-width: 1366px) {
    .keyboard {
        transform: scale(0.95);
    }

    .keyboard-row {
        gap: calc(var(--keyboard-gap) * 0.9);
    }

    .key {
        font-size: 0.75em;
    }
    
    .key.caps { width: clamp(38px, 4.8vw, 48px); }
    .key.shift { width: clamp(42px, 5.2vw, 52px); }
    .key.apagar,
    .key.limpar { width: clamp(40px, 4.8vw, 50px); }
    .key.espaco { width: clamp(75px, 9.5vw, 95px); }
}

@media (max-width: 992px) {
    .keyboard {
        transform: scale(0.9);
        gap: calc(var(--keyboard-gap) * 0.8);
    }

    .keyboard-row {
        gap: calc(var(--keyboard-gap) * 0.8);
    }

    .key {
        --key-base-size: clamp(22px, 2.2vw, 28px);
        font-size: 0.7em;
    }
    
    .key.caps { width: clamp(36px, 4.5vw, 45px); }
    .key.shift { width: clamp(40px, 5vw, 50px); }
    .key.apagar,
    .key.limpar { width: clamp(38px, 4.5vw, 48px); }
    .key.espaco { width: clamp(70px, 9vw, 90px); }
}

@media (max-width: 768px) {
    .keyboard {
        transform: scale(0.85);
    }

    .key {
        --key-base-size: clamp(20px, 2vw, 26px);
        font-size: 0.65em;
    }

    .key:hover {
        transform: none;
    }

    .key:active {
        transform: scale(0.95);
    }
    
    .key.caps { width: clamp(34px, 4.2vw, 42px); }
    .key.shift { width: clamp(38px, 4.8vw, 48px); }
    .key.apagar,
    .key.limpar { width: clamp(36px, 4.2vw, 46px); }
    .key.espaco { width: clamp(65px, 8.5vw, 85px); }
}

@media (max-width: 576px) {
    .keyboard {
        transform: scale(0.8);
    }

    .keyboard-row {
        gap: calc(var(--keyboard-gap) * 0.7);
    }

    .key {
        --key-base-size: clamp(18px, 1.8vw, 24px);
        font-size: 0.6em;
    }
}

/* ==========================================================================
   Tema Escuro
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    .key {
        background-color: rgba(255, 255, 255, 0.1);
        color: var(--primary-light);
        border-color: rgba(255, 255, 255, 0.2);
    }

    .key:hover {
        background-color: rgba(255, 255, 255, 0.2);
    }

    .key.active {
        background-color: var(--accent-dark);
    }
}

/* ==========================================================================
   Suporte Mobile
   ========================================================================== */
.mobile-input {
    height: 45px;
    font-size: 16px !important;
    padding: 0.8rem !important;
    border-radius: var(--key-radius) !important;
    background-color: rgba(255, 255, 255, 0.95) !important;
    border: 2px solid var(--accent-light) !important;
    transition: var(--key-transition) !important;
    width: 100% !important;
    -webkit-appearance: none;
    appearance: none;
}

.mobile-input:focus {
    border-color: var(--accent-dark) !important;
    box-shadow: 0 0 0 2px rgba(var(--accent-light-rgb), 0.25) !important;
    outline: none;
}

.mobile-input.is-valid {
    border-color: #28a745 !important;
}

.mobile-input.is-invalid {
    border-color: #dc3545 !important;
}