/* ============================================
   EFFECTS & THEMES CSS
   Themes: Dark, Light, Neon, Sunset, Ocean
   ============================================ */

/* ============================================
   THEME: LIGHT
   ============================================ */
[data-theme="light"] {
    --primary: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #4338CA;
    --primary-glow: rgba(79, 70, 229, 0.3);

    --secondary: #0891B2;
    --secondary-light: #06B6D4;
    --secondary-dark: #0E7490;
    --secondary-glow: rgba(6, 182, 212, 0.3);

    --accent: #DB2777;
    --accent-light: #EC4899;
    --accent-glow: rgba(236, 72, 153, 0.3);

    --success: #059669;
    --success-light: #10B981;
    --success-glow: rgba(16, 185, 129, 0.3);

    --danger: #DC2626;
    --warning: #D97706;

    /* Light backgrounds */
    --dark: #F8FAFC;
    --dark-lighter: #F1F5F9;
    --dark-light: #E2E8F0;
    --dark-card: rgba(255, 255, 255, 0.95);

    /* Text colors */
    --text: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;

    /* Borders */
    --border: rgba(15, 23, 42, 0.1);
    --border-light: rgba(15, 23, 42, 0.05);

    /* Glass effect */
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(15, 23, 42, 0.1);
}

[data-theme="light"] body {
    background: linear-gradient(135deg, #E0E7FF 0%, #DBEAFE 50%, #E0F2FE 100%);
}

[data-theme="light"] .calculator-container {
    background: var(--glass-bg);
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.15),
        0 0 0 1px var(--glass-border);
}

[data-theme="light"] .btn {
    background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
    color: var(--text);
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.05),
        0 1px 2px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

[data-theme="light"] .btn:hover {
    background: linear-gradient(180deg, #FFFFFF 0%, #E2E8F0 100%);
    transform: translateY(-1px);
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.1),
        0 2px 4px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .btn-operator {
    background: linear-gradient(180deg, var(--secondary-light) 0%, var(--secondary) 100%);
    color: white;
}

[data-theme="light"] .btn-equals {
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
}

[data-theme="light"] .display {
    background: white;
    border: 1px solid var(--border);
}

/* ============================================
   THEME: NEON
   ============================================ */
[data-theme="neon"] {
    --primary: #A855F7;
    --primary-light: #C084FC;
    --primary-dark: #9333EA;
    --primary-glow: rgba(168, 85, 247, 0.6);

    --secondary: #22D3EE;
    --secondary-light: #67E8F9;
    --secondary-dark: #06B6D4;
    --secondary-glow: rgba(34, 211, 238, 0.6);

    --accent: #F472B6;
    --accent-light: #F9A8D4;
    --accent-glow: rgba(244, 114, 182, 0.6);

    --success: #4ADE80;
    --success-light: #86EFAC;
    --success-glow: rgba(74, 222, 128, 0.6);

    --danger: #FB7185;
    --warning: #FBBF24;

    /* Dark backgrounds with purple tint */
    --dark: #0D0015;
    --dark-lighter: #1A0A2E;
    --dark-light: #2D1B47;
    --dark-card: rgba(45, 27, 71, 0.9);

    /* Text colors */
    --text: #F5F3FF;
    --text-secondary: #C4B5FD;
    --text-muted: #A78BFA;

    /* Borders */
    --border: rgba(168, 85, 247, 0.3);
    --border-light: rgba(168, 85, 247, 0.15);

    /* Glass effect */
    --glass-bg: rgba(13, 0, 21, 0.85);
    --glass-border: rgba(168, 85, 247, 0.4);
}

[data-theme="neon"] body {
    background:
        radial-gradient(ellipse at top left, rgba(168, 85, 247, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(34, 211, 238, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at center, rgba(244, 114, 182, 0.1) 0%, transparent 70%),
        #0D0015;
}

[data-theme="neon"] .calculator-container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow:
        0 0 30px rgba(168, 85, 247, 0.3),
        0 0 60px rgba(168, 85, 247, 0.2),
        inset 0 0 30px rgba(168, 85, 247, 0.05);
    animation: neon-pulse 3s ease-in-out infinite;
}

@keyframes neon-pulse {
    0%, 100% {
        box-shadow:
            0 0 30px rgba(168, 85, 247, 0.3),
            0 0 60px rgba(168, 85, 247, 0.2);
    }
    50% {
        box-shadow:
            0 0 40px rgba(168, 85, 247, 0.4),
            0 0 80px rgba(168, 85, 247, 0.3),
            0 0 100px rgba(34, 211, 238, 0.2);
    }
}

[data-theme="neon"] .btn {
    background: rgba(45, 27, 71, 0.8);
    color: var(--text);
    border: 1px solid var(--border);
    text-shadow: 0 0 10px currentColor;
    transition: all 0.2s ease;
}

[data-theme="neon"] .btn:hover {
    background: rgba(168, 85, 247, 0.3);
    border-color: var(--primary);
    box-shadow:
        0 0 15px var(--primary-glow),
        0 0 30px var(--primary-glow),
        inset 0 0 10px rgba(168, 85, 247, 0.2);
    transform: translateY(-2px);
}

[data-theme="neon"] .btn-operator {
    background: rgba(34, 211, 238, 0.2);
    border-color: var(--secondary);
    color: var(--secondary);
}

[data-theme="neon"] .btn-operator:hover {
    background: rgba(34, 211, 238, 0.4);
    box-shadow:
        0 0 20px var(--secondary-glow),
        0 0 40px var(--secondary-glow);
}

[data-theme="neon"] .btn-equals {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border: none;
    box-shadow: 0 0 20px var(--primary-glow);
}

[data-theme="neon"] .btn-equals:hover {
    box-shadow:
        0 0 30px var(--primary-glow),
        0 0 50px var(--accent-glow);
}

[data-theme="neon"] .display {
    background: rgba(13, 0, 21, 0.9);
    border: 1px solid var(--border);
    box-shadow: inset 0 0 20px rgba(168, 85, 247, 0.1);
}

[data-theme="neon"] #result {
    text-shadow:
        0 0 10px var(--primary),
        0 0 20px var(--primary),
        0 0 30px var(--primary);
}

/* ============================================
   THEME: SUNSET
   ============================================ */
[data-theme="sunset"] {
    --primary: #F97316;
    --primary-light: #FB923C;
    --primary-dark: #EA580C;
    --primary-glow: rgba(249, 115, 22, 0.5);

    --secondary: #EAB308;
    --secondary-light: #FACC15;
    --secondary-dark: #CA8A04;
    --secondary-glow: rgba(234, 179, 8, 0.5);

    --accent: #EC4899;
    --accent-light: #F472B6;
    --accent-glow: rgba(236, 72, 153, 0.5);

    --success: #22C55E;
    --danger: #EF4444;
    --warning: #FBBF24;

    /* Warm dark backgrounds */
    --dark: #1C1310;
    --dark-lighter: #2D1F1A;
    --dark-light: #3D2A22;
    --dark-card: rgba(45, 31, 26, 0.95);

    /* Text colors */
    --text: #FFF7ED;
    --text-secondary: #FDBA74;
    --text-muted: #FB923C;

    /* Borders */
    --border: rgba(249, 115, 22, 0.2);
    --border-light: rgba(249, 115, 22, 0.1);

    /* Glass effect */
    --glass-bg: rgba(28, 19, 16, 0.9);
    --glass-border: rgba(249, 115, 22, 0.3);
}

[data-theme="sunset"] body {
    background:
        linear-gradient(180deg,
            #1C1310 0%,
            #2D1F1A 30%,
            #4A2C23 60%,
            #5D3A2D 80%,
            #7C4433 100%);
}

[data-theme="sunset"] .calculator-container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(249, 115, 22, 0.1);
}

[data-theme="sunset"] .btn {
    background: linear-gradient(180deg, rgba(61, 42, 34, 0.9) 0%, rgba(45, 31, 26, 0.9) 100%);
    border: 1px solid var(--border);
}

[data-theme="sunset"] .btn:hover {
    background: linear-gradient(180deg, rgba(249, 115, 22, 0.3) 0%, rgba(234, 88, 12, 0.2) 100%);
    border-color: var(--primary);
}

[data-theme="sunset"] .btn-operator {
    background: linear-gradient(180deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    color: #1C1310;
}

[data-theme="sunset"] .btn-equals {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}

/* ============================================
   THEME: OCEAN
   ============================================ */
[data-theme="ocean"] {
    --primary: #0EA5E9;
    --primary-light: #38BDF8;
    --primary-dark: #0284C7;
    --primary-glow: rgba(14, 165, 233, 0.5);

    --secondary: #14B8A6;
    --secondary-light: #2DD4BF;
    --secondary-dark: #0D9488;
    --secondary-glow: rgba(20, 184, 166, 0.5);

    --accent: #8B5CF6;
    --accent-light: #A78BFA;
    --accent-glow: rgba(139, 92, 246, 0.5);

    --success: #22C55E;
    --danger: #EF4444;
    --warning: #FBBF24;

    /* Deep ocean backgrounds */
    --dark: #0A1628;
    --dark-lighter: #0F1D32;
    --dark-light: #1E3A5F;
    --dark-card: rgba(15, 29, 50, 0.95);

    /* Text colors */
    --text: #E0F2FE;
    --text-secondary: #7DD3FC;
    --text-muted: #38BDF8;

    /* Borders */
    --border: rgba(14, 165, 233, 0.2);
    --border-light: rgba(14, 165, 233, 0.1);

    /* Glass effect */
    --glass-bg: rgba(10, 22, 40, 0.9);
    --glass-border: rgba(14, 165, 233, 0.3);
}

[data-theme="ocean"] body {
    background:
        radial-gradient(ellipse at bottom, rgba(20, 184, 166, 0.15) 0%, transparent 60%),
        linear-gradient(180deg,
            #0A1628 0%,
            #0F1D32 40%,
            #132D4A 70%,
            #1E3A5F 100%);
}

[data-theme="ocean"] .calculator-container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.4),
        0 0 60px rgba(14, 165, 233, 0.1);
}

[data-theme="ocean"] .btn {
    background: linear-gradient(180deg, rgba(30, 58, 95, 0.8) 0%, rgba(15, 29, 50, 0.9) 100%);
    border: 1px solid var(--border);
}

[data-theme="ocean"] .btn:hover {
    background: linear-gradient(180deg, rgba(14, 165, 233, 0.3) 0%, rgba(2, 132, 199, 0.2) 100%);
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
}

[data-theme="ocean"] .btn-operator {
    background: linear-gradient(180deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    color: white;
}

[data-theme="ocean"] .btn-equals {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}

/* ============================================
   KEYBOARD HIGHLIGHT EFFECTS
   ============================================ */
.keyboard-active {
    transform: scale(0.95) !important;
    box-shadow:
        0 0 0 3px var(--primary),
        0 0 20px var(--primary-glow),
        0 0 40px var(--primary-glow) !important;
    background: var(--primary) !important;
    color: white !important;
    transition: all 0.1s ease !important;
}

/* ============================================
   RIPPLE EFFECT
   ============================================ */
.btn {
    position: relative;
    overflow: hidden;
}

.btn-ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: scale(0);
    animation: ripple-effect 0.6s ease-out forwards;
    pointer-events: none;
}

@keyframes ripple-effect {
    to {
        transform: scale(2.5);
        opacity: 0;
    }
}

/* ============================================
   SPARKLE EFFECT
   ============================================ */
.sparkle {
    position: fixed;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    pointer-events: none;
    animation: sparkle-fly 0.6s ease-out forwards;
    box-shadow: 0 0 10px var(--primary-glow);
}

@keyframes sparkle-fly {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(var(--tx), var(--ty)) scale(0);
        opacity: 0;
    }
}

/* ============================================
   COUNTER POP ANIMATION
   ============================================ */
.counter-pop {
    animation: counter-pop 0.3s ease-out;
}

@keyframes counter-pop {
    0% {
        transform: scale(1.1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

/* ============================================
   TOUCH ACTIVE STATE
   ============================================ */
.touch-active {
    transform: scale(0.97);
    opacity: 0.9;
}

/* ============================================
   EFFECTS SETTINGS PANEL
   ============================================ */
.effects-settings {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 10000;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.effects-toggle-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--dark-card, rgba(26, 26, 46, 0.95));
    border: 1px solid var(--border, rgba(148, 163, 184, 0.2));
    color: var(--text, #F1F5F9);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.effects-toggle-btn:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.effects-panel {
    position: absolute;
    bottom: 60px;
    right: 0;
    width: 220px;
    background: var(--dark-card, rgba(26, 26, 46, 0.98));
    border: 1px solid var(--border, rgba(148, 163, 184, 0.2));
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    transition: all 0.3s ease;
}

.effects-panel.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.95);
}

.effects-panel h3 {
    color: var(--text, #F1F5F9);
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 12px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.effects-panel hr {
    border: none;
    border-top: 1px solid var(--border, rgba(148, 163, 184, 0.2));
    margin: 12px 0;
}

.effect-option {
    margin-bottom: 8px;
}

.effect-option label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text, #F1F5F9);
    font-size: 14px;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.effect-option label:hover {
    background: var(--border, rgba(148, 163, 184, 0.1));
}

.effect-option.disabled label {
    opacity: 0.5;
    cursor: not-allowed;
}

.effect-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary, #4F46E5);
    cursor: pointer;
}

.theme-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.theme-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 2px solid transparent;
    background: var(--dark-light, #252541);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn:hover {
    transform: scale(1.1);
    border-color: var(--text-secondary, #94A3B8);
}

.theme-btn.active {
    border-color: var(--primary, #4F46E5);
    box-shadow: 0 0 10px var(--primary-glow, rgba(79, 70, 229, 0.5));
}

/* ============================================
   RESULT ANIMATION ENHANCEMENTS
   ============================================ */
#result {
    transition: transform 0.2s ease, filter 0.2s ease;
}

#result.calculating {
    animation: result-calculating 0.5s ease-in-out infinite;
}

@keyframes result-calculating {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Special result glow for special numbers */
.special-result {
    animation: special-glow 1s ease-in-out;
}

@keyframes special-glow {
    0% {
        text-shadow: 0 0 10px var(--primary);
    }
    50% {
        text-shadow:
            0 0 20px var(--primary),
            0 0 40px var(--accent),
            0 0 60px var(--secondary);
    }
    100% {
        text-shadow: 0 0 10px var(--primary);
    }
}

/* ============================================
   BUTTON ENHANCEMENTS FOR ALL THEMES
   ============================================ */
.btn {
    transition:
        transform 0.15s ease,
        box-shadow 0.2s ease,
        background 0.2s ease,
        border-color 0.2s ease;
}

.btn:active {
    transform: scale(0.95);
}

/* Mode button active states */
.mode-btn.active {
    background: var(--primary) !important;
    color: white !important;
    box-shadow: 0 0 15px var(--primary-glow);
}

/* ============================================
   LOADING SHIMMER
   ============================================ */
.loading-shimmer {
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* ============================================
   RESPONSIVE ADJUSTMENTS FOR EFFECTS
   ============================================ */
@media (max-width: 480px) {
    .effects-settings {
        bottom: 10px;
        right: 10px;
    }

    .effects-toggle-btn {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }

    .effects-panel {
        width: 200px;
        right: 0;
        padding: 12px;
    }

    .theme-btn {
        width: 32px;
        height: 32px;
        font-size: 16px;
    }
}

/* Reduce animations for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    .btn-ripple,
    .sparkle,
    .counter-pop,
    [data-theme="neon"] .calculator-container {
        animation: none !important;
    }

    .btn {
        transition: none !important;
    }
}