/* ============================================
   Math Blaster - HUD Styles
   ============================================ */

.hud {
    position: absolute; top: 0; left: 0; width: 100%; z-index: var(--z-hud);
    padding: var(--space-sm) var(--space-md); display: flex; justify-content: space-between;
    align-items: flex-start; pointer-events: none;
    background: linear-gradient(to bottom, rgba(0,0,0,0.7) 0%, transparent 100%);
}
.hud-left, .hud-right, .hud-center { display: flex; flex-direction: column; gap: var(--space-xs); }
.hud-center { align-items: center; }
.hud-right { align-items: flex-end; }
.hud-label { font-family: var(--font-display); font-size: 9px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 2px; line-height: 1.2; }
.hud-value { font-family: var(--font-display); font-size: 18px; font-weight: 900; color: var(--neon-blue); text-shadow: 0 0 10px var(--neon-blue), 0 0 20px rgba(0,212,255,0.3); line-height: 1.2; }
.hud-value.score { color: var(--neon-yellow); text-shadow: 0 0 10px var(--neon-yellow), 0 0 20px rgba(255,190,11,0.3); }
.hud-value.combo { color: var(--neon-pink); text-shadow: 0 0 10px var(--neon-pink), 0 0 20px rgba(255,0,110,0.3); font-size: 22px; transition: transform var(--transition-fast); }
.combo-active { animation: comboPulse 0.3s ease; }
@keyframes comboPulse { 0% { transform: scale(1); } 50% { transform: scale(1.4); } 100% { transform: scale(1); } }

.health-bar-container { width: 120px; height: 8px; background: rgba(255,255,255,0.1); border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border-light); }
.health-bar { height: 100%; background: linear-gradient(90deg, var(--neon-green), var(--neon-green)); border-radius: var(--radius-sm); transition: width var(--transition-normal); will-change: width; }
.health-bar.medium { background: linear-gradient(90deg, var(--neon-orange), var(--neon-yellow)); }
.health-bar.low { background: linear-gradient(90deg, var(--neon-pink), var(--neon-orange)); animation: healthPulse 0.5s ease infinite; }
@keyframes healthPulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }

.xp-bar-container { width: 100%; max-width: 200px; height: 5px; background: rgba(255,255,255,0.1); border-radius: 3px; overflow: hidden; }
.xp-bar { height: 100%; background: linear-gradient(90deg, var(--neon-purple), var(--neon-blue)); border-radius: 3px; transition: width var(--transition-normal); will-change: width; }

.powerup-indicators { position: absolute; top: 55px; left: 50%; transform: translateX(-50%); display: flex; gap: var(--space-sm); z-index: var(--z-hud); pointer-events: none; }
.powerup-indicator { width: 32px; height: 32px; border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; position: relative; border: 2px solid; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.powerup-indicator .icon-sm { width: 14px; height: 14px; }
.powerup-timer { position: absolute; bottom: -4px; left: 50%; transform: translateX(-50%); width: 24px; height: 3px; background: rgba(255,255,255,0.2); border-radius: 2px; overflow: hidden; }
.powerup-timer-fill { height: 100%; border-radius: 2px; transition: width 0.1s linear; will-change: width; }

/* ============================================
   PAUSE BUTTON
   White background, green icon, clearly visible
   ============================================ */
.pause-btn {
    position: absolute;
    top: var(--space-sm);
    right: 50px;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid var(--neon-green);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-buttons);
    cursor: pointer;
    pointer-events: all;
    transition: all var(--transition-fast);
    padding: 0;
    outline: none;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.pause-btn:hover {
    background: #ffffff;
    box-shadow: 0 2px 15px rgba(0,255,135,0.3);
}
.pause-btn:active {
    transform: scale(0.9);
}

/* Pause icon bars - green color on white background */
.pause-btn .icon-pause::before,
.pause-btn .icon-pause::after {
    background: #00cc6a !important;
}

/* Resume icon triangle - green color on white background */
.pause-btn .icon-resume::after {
    border-color: transparent transparent transparent #00cc6a !important;
}

/* ============================================
   KEYBOARD BUTTON
   Hidden during gameplay when using built-in keyboard
   ============================================ */
.keyboard-btn {
    position: absolute;
    bottom: 70px;
    right: var(--space-md);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid var(--neon-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-buttons);
    cursor: pointer;
    pointer-events: all;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
    padding: 0;
    outline: none;
}
.keyboard-btn:active {
    transform: scale(0.9);
}

/* Keyboard icon - blue on white */
.keyboard-btn .icon-keyboard::after {
    border-color: var(--neon-blue) !important;
    background: transparent !important;
}
.keyboard-btn .icon-keyboard::before {
    background: var(--neon-blue) !important;
}

.keyboard-btn.keyboard-open { bottom: calc(var(--keyboard-height, 300px) + 70px); }
.keyboard-btn.gk-active { bottom: 225px; }

/* Input Area */
.input-area {
    position: absolute; bottom: 0; left: 0; width: 100%; z-index: var(--z-hud);
    padding: var(--space-sm) var(--space-md) var(--space-md);
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.6) 70%, transparent 100%);
    transition: bottom 0.3s ease;
}
.input-area.keyboard-open { bottom: var(--keyboard-height, 0px); }
.input-area.gk-active { bottom: 155px; }

.typing-display {
    width: 100%; padding: 10px 16px; background: rgba(255,255,255,0.05);
    border: 2px solid var(--neon-blue); border-radius: var(--radius-lg);
    font-family: var(--font-display); font-size: 20px; color: var(--neon-blue);
    text-align: center; min-height: 48px; display: flex; align-items: center;
    justify-content: center; letter-spacing: 3px; text-shadow: 0 0 10px var(--neon-blue);
    box-shadow: 0 0 15px rgba(0,212,255,0.2), inset 0 0 15px rgba(0,212,255,0.05);
    position: relative; overflow: hidden; cursor: text; user-select: none; -webkit-user-select: none;
}
.typing-display::after { content: '|'; animation: cursorBlink 0.7s ease infinite; margin-left: 2px; color: var(--neon-blue); }
.typing-display.has-text::after { animation: cursorBlink 0.5s ease infinite; }
@keyframes cursorBlink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.typing-correct { color: var(--neon-green); text-shadow: 0 0 8px rgba(0,255,135,0.5); }
.typing-wrong { color: var(--neon-pink); text-shadow: 0 0 8px rgba(255,0,110,0.5); }
.typing-remaining { color: var(--text-muted); }

/* Wave Banner */
.wave-banner { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); font-family: var(--font-display); font-size: clamp(24px,7vw,48px); font-weight: 900; color: var(--neon-blue); text-shadow: 0 0 30px var(--neon-blue), 0 0 60px rgba(0,212,255,0.3); z-index: var(--z-floating); pointer-events: none; animation: waveBanner 2s ease forwards; text-align: center; white-space: nowrap; }
.wave-banner.boss-wave { color: var(--neon-pink); text-shadow: 0 0 30px var(--neon-pink), 0 0 60px rgba(255,0,110,0.3); }
@keyframes waveBanner { 0% { opacity: 0; transform: translate(-50%,-50%) scale(0.5); } 20% { opacity: 1; transform: translate(-50%,-50%) scale(1.2); } 40% { transform: translate(-50%,-50%) scale(1); } 80% { opacity: 1; } 100% { opacity: 0; transform: translate(-50%,-50%) scale(0.8); } }

.float-text { position: absolute; font-family: var(--font-display); font-weight: 900; pointer-events: none; z-index: var(--z-floating); animation: floatUp 1s ease forwards; white-space: nowrap; }
@keyframes floatUp { 0% { opacity: 1; transform: translateY(0) scale(1); } 100% { opacity: 0; transform: translateY(-60px) scale(0.5); } }

.achievement-popup { position: absolute; top: 60px; left: 50%; transform: translateX(-50%); background: linear-gradient(135deg, rgba(131,56,236,0.9), rgba(0,212,255,0.9)); border-radius: var(--radius-lg); padding: 10px 20px; z-index: var(--z-popups); animation: achieveSlide 3s ease forwards; text-align: center; white-space: nowrap; backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.2); }
.achievement-popup .achieve-title { font-family: var(--font-display); font-size: 10px; letter-spacing: 2px; color: rgba(255,255,255,0.8); text-transform: uppercase; }
.achievement-popup .achieve-name { font-family: var(--font-display); font-size: 14px; font-weight: 700; color: var(--text-primary); }
@keyframes achieveSlide { 0% { opacity: 0; transform: translateX(-50%) translateY(-20px); } 10% { opacity: 1; transform: translateX(-50%) translateY(0); } 80% { opacity: 1; } 100% { opacity: 0; transform: translateX(-50%) translateY(-10px); } }

/* ============================================
   BUILT-IN GAME KEYBOARD
   No keyboard icon button - removed to prevent
   blocking letters like L
   ============================================ */
.game-keyboard {
    position: fixed; bottom: 0; left: 0; width: 100%; z-index: var(--z-hud);
    padding: 6px 4px 10px;
    background: linear-gradient(to top, rgba(10,10,26,0.98) 0%, rgba(10,10,26,0.95) 100%);
    border-top: 1px solid rgba(0,212,255,0.15);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    display: flex; flex-direction: column; align-items: center; gap: 5px;
    user-select: none; -webkit-user-select: none; touch-action: manipulation;
}
.gk-row { display: flex; gap: 4px; justify-content: center; width: 100%; max-width: 500px; }
.gk-key {
    flex: 1; max-width: 42px; height: 44px;
    border: 1px solid rgba(255,255,255,0.15); border-radius: 6px;
    background: rgba(255,255,255,0.08); color: #ffffff;
    font-family: var(--font-display); font-size: 15px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; outline: none; padding: 0;
    transition: background 0.1s, transform 0.1s, border-color 0.1s;
    -webkit-tap-highlight-color: transparent; touch-action: manipulation;
}
.gk-key:active, .gk-key.pressed { background: rgba(0,212,255,0.3); border-color: var(--neon-blue); transform: scale(0.92); }
.gk-key.correct { background: rgba(0,255,135,0.25); border-color: var(--neon-green); }
.gk-key.wrong { background: rgba(255,0,110,0.25); border-color: var(--neon-pink); }

/* Backspace key - wider, shows X text instead of icon */
.gk-backspace {
    flex: 1.5; max-width: 64px;
    background: rgba(255,0,110,0.1); border-color: rgba(255,0,110,0.2);
    font-size: 18px; color: #ff006e;
}
.gk-backspace:active { background: rgba(255,0,110,0.3); border-color: var(--neon-pink); }

.gk-spacer { width: 20px; flex-shrink: 0; }
.gk-spacer-half { width: 10px; flex-shrink: 0; }

/* Keyboard type toggle in settings */
.keyboard-type-btn {
    font-family: var(--font-display); font-size: 11px; padding: 6px 16px;
    border-radius: var(--radius-md); border: 1px solid var(--neon-blue);
    background: rgba(0,212,255,0.1); color: var(--neon-blue);
    cursor: pointer; transition: all var(--transition-normal);
    text-transform: uppercase; letter-spacing: 1px; outline: none;
    min-width: 80px; text-align: center;
}
.keyboard-type-btn:hover { background: rgba(0,212,255,0.2); }
.keyboard-type-btn:active { transform: scale(0.95); }

@media (max-width: 360px) {
    .gk-key { height: 38px; font-size: 13px; max-width: 36px; }
    .gk-backspace { max-width: 54px; font-size: 16px; }
    .game-keyboard { padding: 4px 3px 8px; gap: 3px; }
    .gk-row { gap: 3px; }
    .input-area.gk-active { bottom: 135px; }
    .keyboard-btn.gk-active { bottom: 205px; }
}
@media (min-width: 481px) {
    .gk-key { height: 48px; font-size: 16px; max-width: 48px; }
    .gk-backspace { max-width: 72px; font-size: 20px; }
}
@media (max-height: 420px) and (orientation: landscape) {
    .gk-key { height: 34px; font-size: 12px; max-width: 36px; }
    .game-keyboard { padding: 3px 4px 5px; gap: 2px; }
    .gk-row { gap: 2px; }
    .input-area.gk-active { bottom: 115px; }
    .keyboard-btn.gk-active { bottom: 180px; }
}