/* ==========================================================================
   THEME ROOT VARIABLES / GLOBAL BEHAVIOURS
   ========================================================================== */
:root {
    --bg-primary: #1e3a8a;
    --bg-secondary: #222c3b;
    --bg-tertiary: #101206;
    --text-accent: #ffffff;
    --text-primary: #ddd;
    --text-secondary: #929292;
    --text-tertiary: #5e5e5e;
    --text-success: #fbbf24;
    --text-danger: #ed6e57;
    font-size: 24px;
}
.game-mode-button:hover,
.game-mode-option:hover,
.game-type-dropdown-button:hover,
.modal-option:hover,
.main-toolbar-menu-option:hover,
.main-toolbar-menu-option:hover,
.mobile-toolbar-button:hover,
.toolbar-btn:hover,
.link-styling:hover  {
    color: var(--text-accent);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}
@media (max-width: 525px) {
    :root {
        font-size: 20px;
    }
}

/* ==========================================================================
GLOBAL / RESET
========================================================================== */
body {
    background-color: var(--bg-primary);
    box-sizing: border-box;
    color: var(--text-primary);
    font-family: 'Inter', Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ==========================================================================
   MAIN LAYOUT: Toolbars, Headers, Nav
   ========================================================================== */
.main-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    cursor: pointer;
    z-index: 10000;
}
.app-title {
    font-size: 2rem;
    font-weight: bold;
    margin: 0;
    padding: 0.5rem 1rem;
}
.main-toolbar-menu {
    display: flex;
    gap: 1rem;
    font-size: 0.5rem;
    padding: 0.5rem 1rem;
}
.main-toolbar-menu-option {
    color: var(--text-secondary);
    font-weight: normal;
    margin: 0;
}
.main-toolbar-menu-option-version {
    color: var(--text-secondary);
    font-size: 0.5rem;
    margin: 0;
}
header {
    width: 100%;
    position: relative;
}

/* Hamburger button (hidden by default) */
.hamburger {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: none;
    font-size: 2rem;
    padding: 0.5rem 1rem;
    position: absolute;
    right: 0;
    top: 0;
    z-index: 1;
}

/* Nav styles for desktop */
.main-toolbar-menu {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: flex-end;
    margin: 0;
    z-index: 2;
}

/* Hide nav and show hamburger on mobile */
@media (max-width: 700px) {
    .hamburger {
        display: block;
    }
    .main-toolbar-menu {
        background: var(--bg-secondary); /* card-like look */
        border-radius: 0.5rem;
        color: var(--text-secondary);
        display: none;
        flex-direction: column;
        align-items: flex-end;
        min-width: 200px;
        right: 16px;
        top: 56px; /* adjust for header height */
        position: absolute;
        padding: 0.75rem 0;
        gap: 0;
        border: none;
    }
    .main-toolbar-menu.open {
        display: flex;
        animation: fadeInNav 0.18s;
    }
    .main-toolbar-menu-option {
        color: var(--text-secondary);
        background: transparent;
        border: none;
        padding: 1rem;
        font-size: 1rem;
        cursor: pointer;
        border-radius: 0.5rem 0 0 0.5rem;
        width: 100%;
        text-align: right;
        transition: background 0.14s, color 0.14s;
    }
    .main-toolbar-menu-option-version {
        font-size: 0.5rem;
    }
    @keyframes fadeInNav {
        from { opacity: 0; transform: translateY(-16px);}
        to { opacity: 1; transform: none;}
    }
}

/* ==========================================================================
   GAME UI COMPONENTS
   ========================================================================== */
#game-progress {
    color: var(--text-secondary);
    font-size: 1.25rem;
    font-weight: 600;
    position: fixed;
    left: 50%;
    top: 32%;
    transform: translateX(-50%);
}
.equation-row {
    width: 100%;
    transform: translate(-50%, -50%);
    top: 45%;
    position: fixed;
    left: 50%;
    justify-content: center;
    gap: 1rem;
    font-weight: 600;
    font-size: 1.25rem;
    flex-wrap: wrap;
    display: flex;
    align-items: center;
}
.problem {
    color: var(--text-accent);
    white-space: nowrap;
}
.answer {
    align-items: center;
    display: flex;
    gap: 1rem;
}
.answer-input {
    background: var(--bg-secondary);
    border: none;
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 1.25rem;
    outline: none;
    padding: 0.5rem 0.25rem;
    text-align: center;
    width: 5rem;
}
.answer-input:disabled {
    background: #374151;
    color: #8b8fa4;
}

.fraction-problem-layout {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;   
}

.fraction-operator {
    margin: 0 1rem;
    font-weight: bold;
}

.fraction {
    display: inline-flex;
    flex-direction: column;
    text-align: center;
    vertical-align: middle;
}

.numerator {
    padding: 0.1em 0.4em;
    border-bottom: 2px solid currentColor;
}

.denominator {
    padding: 0.1em 0.4em;
}

.fraction-answer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem; /* A small gap between inputs and the bar */
}

.fraction-bar {
    width: 80%; /* Make it slightly smaller than the input width */
    height: 2px;
    background-color: var(--text-secondary);
    border-radius: 1px;
}

/* We'll use this to hide/show elements */
.hidden {
    display: none !important;
}

/* Optional: Add placeholder text color */
.answer-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}
/* ==========================================================================
   GAME MODES (BOTTOM CONTROLS)
   ========================================================================== */
.game-options {
    bottom: 0;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    left: 0;
    margin: 0.8rem 1rem;
    position: fixed;
}
.game-mode-options {
    align-items: center;
    display: flex;
    gap: 1rem;
}
.game-mode-buttons {
    display: flex;
    gap: 1rem;
    font-size: 1.25rem;
}
.endless-key-hint-key {
    background: var(--text-secondary);
    border-radius: 0.375rem;
    color: var(--bg-primary);
    font-size: 0.75rem;
    padding: 0.15rem 0.3rem;
}

/* ==========================================================================
   KEY HINTS (BOTTOM RIGHT)
   ========================================================================== */
.key-hints-container {
    bottom: 0;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 0.8rem 1rem;
    position: fixed;
    right: 0;
}
.key-hints {
    align-items: end;
    display: flex;
    flex-direction: column;
    font-size: 0.8rem;
    gap: 0.8rem;
}
.key-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.key-hint-key {
    background: var(--text-secondary);
    border-radius: 0.375rem;
    color: var(--bg-primary);
    padding: 0.2rem 0.4rem;
}
@media (max-width: 700px) {
    #reset .key-hint-key, .results-key-hint-key {
        display: none;
    }
}
.key-hint:hover .key-hint-key {
    background: var(--text-primary);
    color: var(--bg-primary);
}
.key-hint:hover .key-hint-text {
     color: var(--text-primary);
}
@media (max-width: 700px) {
    .key-hints-container {
        display: none;
    }
}
/* ==========================================================================
   UTILITIES / STATES
   ========================================================================== */
.selected {
    color: var(--text-primary);
}
.hidden {
    display: none !important;
}
.answer-input.error {
    color: var(--text-danger);
    border-color: var(--text-danger);
}
.answer-input.success {
    color: var(--text-success);
    border-color: var(--text-success);
}

/* ==========================================================================
   OS-SPECIFIC KEY HINTS
   ========================================================================== */
.os-cmd, .os-ctrl { display: none; }
body.mac .os-cmd { display: inline-block; }
body.mac .os-ctrl { display: none; }
body.win .os-ctrl,
body.linux .os-ctrl,
body.other .os-ctrl { display: inline-block; }
body.win .os-cmd,
body.linux .os-cmd,
body.other .os-cmd { display: none; }