/* ===================================
   CSS Variables & Reset
   =================================== */

:root {
    /* Color Palette - Pixel Matrix */
    --color-bg: #f8f9fa;
    --color-bg-card: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;

    /* Neon Accents */
    --color-matrix-green: #00ff41;
    --color-electric-blue: #00d9ff;
    --color-hot-pink: #ff006e;
    --color-cyber-purple: #b026ff;

    /* Gradients */
    --gradient-neon: linear-gradient(135deg, var(--color-matrix-green), var(--color-electric-blue));
    --gradient-cyber: linear-gradient(135deg, var(--color-hot-pink), var(--color-cyber-purple));
    --gradient-matrix: linear-gradient(180deg, var(--color-matrix-green), #00cc33);

    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Effects */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    --shadow-neon: 0 0 20px rgba(0, 255, 65, 0.3);
    --shadow-cyber: 0 0 30px rgba(255, 0, 110, 0.4);

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ===================================
   Grid Background Animation
   =================================== */

.grid-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

.grid-line {
    position: absolute;
    background: linear-gradient(90deg, transparent, var(--color-matrix-green), transparent);
    animation: gridSlide 8s linear infinite;
}

.grid-line:nth-child(1) {
    top: 10%;
    left: 0;
    width: 100%;
    height: 1px;
    animation-delay: 0s;
}

.grid-line:nth-child(2) {
    top: 40%;
    left: 0;
    width: 100%;
    height: 1px;
    animation-delay: 2s;
}

.grid-line:nth-child(3) {
    top: 70%;
    left: 0;
    width: 100%;
    height: 1px;
    animation-delay: 4s;
}

.grid-line:nth-child(4) {
    left: 50%;
    top: 0;
    width: 1px;
    height: 100%;
    background: linear-gradient(180deg, transparent, var(--color-electric-blue), transparent);
    animation: gridSlideVertical 6s linear infinite;
}

@keyframes gridSlide {
    0% {
        opacity: 0;
        transform: translateX(-100%);
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateX(100%);
    }
}

@keyframes gridSlideVertical {
    0% {
        opacity: 0;
        transform: translateY(-100%);
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateY(100%);
    }
}

.scanline {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-matrix-green), transparent);
    box-shadow: 0 0 10px var(--color-matrix-green);
    animation: scanlineMove 3s linear infinite;
}

@keyframes scanlineMove {
    0% {
        transform: translateY(0);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}

/* ===================================
   Pixel Corner Decorations
   =================================== */

.pixel-corner {
    position: fixed;
    width: 60px;
    height: 60px;
    z-index: 1;
    pointer-events: none;
}

.pixel-corner::before,
.pixel-corner::after {
    content: '';
    position: absolute;
    background: var(--gradient-neon);
    opacity: 0.6;
}

.pixel-tl {
    top: var(--spacing-lg);
    left: var(--spacing-lg);
}

.pixel-tl::before {
    width: 40px;
    height: 4px;
    top: 0;
    left: 0;
}

.pixel-tl::after {
    width: 4px;
    height: 40px;
    top: 0;
    left: 0;
}

.pixel-tr {
    top: var(--spacing-lg);
    right: var(--spacing-lg);
}

.pixel-tr::before {
    width: 40px;
    height: 4px;
    top: 0;
    right: 0;
}

.pixel-tr::after {
    width: 4px;
    height: 40px;
    top: 0;
    right: 0;
}

.pixel-bl {
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
}

.pixel-bl::before {
    width: 40px;
    height: 4px;
    bottom: 0;
    left: 0;
}

.pixel-bl::after {
    width: 4px;
    height: 40px;
    bottom: 0;
    left: 0;
}

.pixel-br {
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
}

.pixel-br::before {
    width: 40px;
    height: 4px;
    bottom: 0;
    right: 0;
}

.pixel-br::after {
    width: 4px;
    height: 40px;
    bottom: 0;
    right: 0;
}

/* ===================================
   Container
   =================================== */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 2;
}

/* ===================================
   Header
   =================================== */

.header {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-neon);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-neon);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(0, 255, 65, 0.6);
    }
}

.qr-pattern {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3px;
    width: 30px;
    height: 30px;
}

.qr-pattern span {
    width: 8px;
    height: 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 1px;
}

.qr-pattern span.active {
    background: #000;
    animation: blink 1.5s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 1px;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.tagline {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ===================================
   Content Grid
   =================================== */

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   Cards
   =================================== */

.card {
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
}

.card:hover {
    border-color: var(--color-matrix-green);
    box-shadow: var(--shadow-lg), var(--shadow-neon);
    transform: translateY(-2px);
}

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-bottom: 2px solid var(--color-border);
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-title i {
    color: var(--color-matrix-green);
    font-size: 1rem;
}

.card-body {
    padding: var(--spacing-lg);
}

/* ===================================
   Input Section
   =================================== */

.input-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.input-textarea {
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.6;
    background: #f8f9fa;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    resize: vertical;
    transition: all var(--transition);
    margin-bottom: var(--spacing-lg);
}

.input-textarea:focus {
    outline: none;
    border-color: var(--color-matrix-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 65, 0.1);
    background: #fff;
}

.input-textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* ===================================
   Options Grid
   =================================== */

.options-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.option-label i {
    color: var(--color-electric-blue);
    font-size: 0.875rem;
}

/* Size Buttons */
.size-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.btn-size {
    padding: var(--spacing-md);
    background: #f8f9fa;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.btn-size:hover {
    border-color: var(--color-matrix-green);
    background: #fff;
    transform: translateY(-2px);
}

.btn-size.active {
    border-color: var(--color-matrix-green);
    background: linear-gradient(135deg, rgba(0, 255, 65, 0.1), rgba(0, 217, 255, 0.1));
    box-shadow: 0 0 10px rgba(0, 255, 65, 0.2);
}

.size-label {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.size-value {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Color Pickers */
.color-pickers {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.color-picker-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.picker-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.picker-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: #f8f9fa;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--transition);
}

.picker-wrapper:hover {
    border-color: var(--color-hot-pink);
}

.color-input {
    width: 50px;
    height: 40px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.color-hex {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text);
    font-weight: 600;
}

/* ===================================
   Buttons
   =================================== */

.button-group {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-sm);
}

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-generate {
    background: var(--gradient-neon);
    border-color: var(--color-matrix-green);
    color: #000;
    font-weight: 700;
    box-shadow: var(--shadow-neon);
}

.btn-generate:hover {
    box-shadow: 0 0 30px rgba(0, 255, 65, 0.5);
}

.btn-glitch {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    animation: glitch 3s infinite;
}

@keyframes glitch {
    0%, 100% {
        left: -100%;
    }
    50% {
        left: 100%;
    }
}

.btn-secondary {
    background: #fff;
    border-color: var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-hot-pink);
}

.btn-download {
    width: 100%;
    background: var(--gradient-cyber);
    border-color: var(--color-hot-pink);
    color: #fff;
    font-weight: 700;
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-cyber);
}

.btn-download:hover:not(:disabled) {
    box-shadow: 0 0 30px rgba(255, 0, 110, 0.6);
}

/* ===================================
   QR Code Display
   =================================== */

.qr-display-wrapper {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.qr-display {
    width: 100%;
    aspect-ratio: 1;
    background: #fff;
    border: 3px solid var(--color-border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-md);
}

.qr-display canvas {
    max-width: 100%;
    max-height: 100%;
    image-rendering: pixelated;
}

.qr-placeholder {
    text-align: center;
    color: var(--color-text-muted);
}

.qr-placeholder i {
    font-size: 4rem;
    opacity: 0.3;
    margin-bottom: var(--spacing-md);
    color: var(--color-matrix-green);
}

.qr-placeholder p {
    font-size: 0.9375rem;
    font-weight: 500;
}

/* QR Code Corners */
.qr-corners {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.corner {
    position: absolute;
    width: 30px;
    height: 30px;
    border: 3px solid var(--color-matrix-green);
    opacity: 0;
    transition: opacity var(--transition);
}

.qr-display.has-qr ~ .qr-corners .corner {
    opacity: 1;
}

.corner-tl {
    top: -3px;
    left: -3px;
    border-right: none;
    border-bottom: none;
    border-radius: 12px 0 0 0;
}

.corner-tr {
    top: -3px;
    right: -3px;
    border-left: none;
    border-bottom: none;
    border-radius: 0 12px 0 0;
}

.corner-bl {
    bottom: -3px;
    left: -3px;
    border-right: none;
    border-top: none;
    border-radius: 0 0 0 12px;
}

.corner-br {
    bottom: -3px;
    right: -3px;
    border-left: none;
    border-top: none;
    border-radius: 0 0 12px 0;
}

/* ===================================
   QR Code Info
   =================================== */

.qr-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: #f8f9fa;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    margin-top: var(--spacing-lg);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-align: center;
}

.info-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.info-value {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--color-text);
    font-weight: 600;
}

.info-value.status {
    color: var(--color-matrix-green);
}

/* ===================================
   Footer
   =================================== */

.footer {
    padding: var(--spacing-lg) 0 var(--spacing-xl);
    text-align: center;
    border-top: 2px solid var(--color-border);
}

.footer p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.footer i {
    color: var(--color-electric-blue);
}

/* ===================================
   Toast Notification
   =================================== */

.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%) translateY(150%);
    background: var(--color-text);
    color: var(--color-matrix-green);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 8px;
    border: 2px solid var(--color-matrix-green);
    box-shadow: var(--shadow-lg), var(--shadow-neon);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    z-index: 1000;
    transition: transform var(--transition);
    font-family: var(--font-mono);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast i {
    font-size: 1.125rem;
}

.toast.error {
    color: var(--color-hot-pink);
    border-color: var(--color-hot-pink);
    box-shadow: var(--shadow-lg), var(--shadow-cyber);
}

/* ===================================
   Responsive
   =================================== */

@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .qr-display {
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-lg) 0;
    }

    .logo {
        flex-direction: column;
        text-align: center;
    }

    .logo-text h1 {
        font-size: 1.5rem;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

    .color-pickers {
        grid-template-columns: 1fr;
    }

    .qr-info {
        grid-template-columns: 1fr;
    }

    .pixel-corner {
        width: 40px;
        height: 40px;
    }

    .pixel-tl::before,
    .pixel-tr::before,
    .pixel-bl::before,
    .pixel-br::before {
        width: 30px;
    }

    .pixel-tl::after,
    .pixel-tr::after,
    .pixel-bl::after,
    .pixel-br::after {
        height: 30px;
    }
}

/* ===================================
   Utilities
   =================================== */

.hidden {
    display: none !important;
}

/* Selection */
::selection {
    background: var(--color-matrix-green);
    color: #000;
}

::-moz-selection {
    background: var(--color-matrix-green);
    color: #000;
}