:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: 1px solid rgba(255, 255, 255, 0.2);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-hover: #6366f1;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --glass-bg: rgba(30, 41, 59, 0.8);
    --glass-border: 1px solid rgba(255, 255, 255, 0.05);
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-color);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
    background-image:
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(14, 165, 233, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Navbar */
/* Header Actions */
.header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 20px;
    position: relative;
    z-index: 100;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.visitor-badge {
    display: flex;
    align-items: center;
    opacity: 0.9;
    transition: opacity 0.2s;
}

.visitor-badge:hover {
    opacity: 1;
}

.visitor-text {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.2);
    display: flex;
    gap: 6px;
    align-items: center;
    box-shadow: 0 2px 4px rgba(99, 102, 241, 0.1);
}

#visitor-count {
    font-weight: 800;
    letter-spacing: 0.5px;
}

/* GitHub Button */
/* GitHub Button - Crazy Animation */
.github-btn {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    background: var(--surface-color);
    border: 2px solid transparent;
    border-radius: 50px;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 700;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    z-index: 1;
}

/* Animated Gradient Background on Hover */
.github-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50px;
    padding: 2px;
    background: linear-gradient(45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
    background-size: 400%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    /* Standard property */
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
    animation: crazy-border 20s linear infinite;
}

.github-btn:hover {
    color: var(--primary-color);
    transform: scale(1.1) rotate(-2deg);
    box-shadow:
        0 0 10px #ff0000,
        0 0 20px #48ff00,
        0 0 40px #002bff;
    text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.1);
    animation: shake 0.5s cubic-bezier(.36, .07, .19, .97) both infinite;
}

.github-btn:hover::before {
    opacity: 1;
    animation: crazy-border 2s linear infinite;
}

.github-btn svg {
    transition: transform 0.3s ease;
}

.github-btn:hover svg {
    transform: rotate(360deg) scale(1.3);
    filter: drop-shadow(0 0 5px currentColor);
}

@keyframes crazy-border {
    0% {
        background-position: 0 0;
    }

    50% {
        background-position: 400% 0;
    }

    100% {
        background-position: 0 0;
    }
}

@keyframes shake {

    10%,
    90% {
        transform: scale(1.1) rotate(-1deg);
    }

    20%,
    80% {
        transform: scale(1.1) rotate(2deg);
    }

    30%,
    50%,
    70% {
        transform: scale(1.1) rotate(-2deg);
    }

    40%,
    60% {
        transform: scale(1.1) rotate(2deg);
    }
}

[data-theme="dark"] .github-btn {
    background: rgba(30, 41, 59, 0.8);
    color: #fff;
}



/* Theme Toggle */
.theme-toggle {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    /* Circle */
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Main Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Glassmorphism Cards */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* QR Type Tabs */
.qr-type-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding: 5px;
    scrollbar-width: none;
}

.qr-type-tabs::-webkit-scrollbar {
    display: none;
}

.qr-type-tab {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    font-weight: 500;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.qr-type-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.qr-type-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Layout */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 30px;
    align-items: start;
}

/* Steps */
.step-section {
    margin-bottom: 30px;
}

.step-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--primary-color);
    color: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

.step-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Forms */
.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.2s;
    background: var(--surface-color);
    color: var(--text-primary);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Design Options */
.design-tabs {
    display: flex;
    background: var(--surface-color);
    padding: 6px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    gap: 6px;
}

.design-tab {
    flex: 1;
    text-align: center;
    padding: 10px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    color: var(--text-secondary);
}

.design-tab.active {
    background: var(--bg-color);
    /* Inverted for tab effect */
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .design-tab.active {
    background: var(--primary-color);
    color: white;
}

.shape-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.shape-option {
    aspect-ratio: 1;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-color);
}

.shape-option:hover {
    border-color: var(--text-secondary);
}

.shape-option.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

/* Color Inputs */
.color-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--surface-color);
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.color-picker {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    cursor: pointer;
    padding: 0;
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 8px;
}

.color-hex {
    font-family: monospace;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Preview Area */
.qr-preview {
    position: sticky;
    top: 40px;
    text-align: center;
}

#qr-code-container {
    background: white;
    /* QR needs white context usually or transparent */
    padding: 20px;
    border-radius: 20px;
    margin: 0 auto 30px;
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    justify-content: center;
    align-items: center;
}

/* For dark mode, maybe a slight border around the white QR area */
[data-theme="dark"] #qr-code-container {
    background: white;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.05);
}

.download-btn {
    background: linear-gradient(135deg, var(--primary-color), #4f46e5);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

/* Utility */
.hidden {
    display: none;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* Responsive */
@media (max-width: 1024px) {
    .container {
        padding: 20px;
        max-width: 95%;
    }
}

@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .qr-preview {
        position: static;
        margin-top: 40px;
    }
}

@media (max-width: 600px) {
    .header-actions {
        flex-direction: column;
        gap: 15px;
        padding: 10px 0;
        align-items: stretch;
    }

    .header-left {
        width: 100%;
        justify-content: space-between;
    }

    .github-btn {
        width: auto;
        padding: 8px 16px;
    }

    .github-btn span {
        display: none;
    }

    .header-right {
        width: 100%;
        justify-content: center;
    }

    .visitor-badge {
        width: 100%;
        justify-content: center;
    }

    .container {
        padding: 15px;
    }

    .glass-card {
        padding: 20px;
        border-radius: 16px;
    }

    .shape-options {
        grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
        gap: 10px;
    }

    .color-inputs {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .form-input {
        font-size: 16px;
        /* 16px prevents zoom on iOS */
        padding: 12px 15px;
    }

    .qr-type-tab {
        padding: 10px 16px;
        font-size: 14px;
        flex-shrink: 0;
    }
}

@media (max-width: 480px) {
    .qr-type-tabs {
        gap: 8px;
    }

    .download-btn {
        width: 100%;
        padding: 14px;
        font-size: 14px;
    }

    .visitor-badge {
        font-size: 12px;
    }
}