:root {
    --primary: #0052FF;
    --primary-glow: #0052ff66;
    --bg-dark: #05070A;
    --bg-card: #0D1117;
    --text-main: #FFFFFF;
    --text-dim: #A0AEC0;
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.main-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.home-page {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 120px 20px 80px;
    position: relative;
    z-index: 1;
}

.bg-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, #0a101f, var(--bg-dark));
    z-index: -1;
}

/* --- NAVBAR / HEADER --- */
.app-header {
    height: 80px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(5, 7, 10, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.3rem;
    font-weight: 900;
    letter-spacing: 1px;
}

.logo-icon {
    background: var(--primary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    box-shadow: 0 0 15px var(--primary-glow);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    color: var(--text-dim);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
}

.nav-links a:hover {
    color: var(--text-main);
}

/* --- HERO SECTION --- */
.hero-section {
    text-align: center;
    margin-bottom: 50px;
}

.hero-section h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 15px;
    background: linear-gradient(to bottom, #fff, #888);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section p {
    color: var(--text-dim);
    font-size: 1.2rem;
}

.generator-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    width: 100%;
    max-width: 900px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(20px);
}

.generator-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(60deg, var(--primary-glow), transparent, var(--primary-glow), transparent);
    background-size: 300% 300%;
    z-index: -1;
    animation: glowMovement 8s ease infinite;
    border-radius: var(--radius);
}

.modal-body {
    display: flex;
}

.preview-panel {
    flex: 1;
    background: rgba(255, 255, 255, 0.02);
    padding: 60px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.qr-canvas-wrapper {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.qr-canvas-wrapper:hover {
    transform: scale(1.02);
}

.qr-hint {
    margin-top: 20px;
    color: var(--text-dim);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.controls-panel {
    flex: 1.4;
    padding: 50px;
}

.modal-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 30px;
}

.input-group label {
    display: block;
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.input-field {
    position: relative;
    margin-bottom: 30px;
}

.input-field input {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px 20px;
    color: white;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.input-field input:focus {
    border-color: var(--primary);
    outline: none;
    background: rgba(0, 82, 255, 0.05);
    box-shadow: 0 0 15px rgba(0, 82, 255, 0.1);
}

.valid-check {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #10b981;
}

.format-select {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px;
    color: white;
    border-radius: 8px;
    margin-top: 10px;
    cursor: pointer;
    outline: none;
}

.format-select option {
    background: var(--primary);
    color: white;
}

.format-select:focus {
    border-color: var(--primary);
    background: var(--primary-glow);
}


/* Color Picker */
.color-picker {
    display: flex;
    gap: 15px;
    margin: 15px 0 40px;
}

.color-dot {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.color-dot.active {
    border-color: white;
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.modal-footer {
    display: flex;
    gap: 15px;
}

.btn-primary {
    flex: 2;
    background: var(--primary);
    color: white;
    padding: 16px;
    border-radius: 8px;
    border: none;
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px var(--primary-glow);
    filter: brightness(1.1);
}

.btn-secondary {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    color: white;
    padding: 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {

    .home-page {
        padding: 100px 15px 40px;
        align-items: flex-start;
    }

    .hero-section {
        margin-bottom: 30px;
    }

    .hero-section h1 {
        font-size: 2rem;
        letter-spacing: -1px;
    }

    .hero-section p {
        font-size: 1rem;
        padding: 0 10px;
    }

    .generator-card {
        border-radius: 12px;
    }

    .modal-body {
        flex-direction: column;
    }

    .preview-panel {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        padding: 30px 20px;
        background: rgba(255, 255, 255, 0.01);
    }

    .qr-canvas-wrapper {
        padding: 12px;
    }

    .qr-canvas-wrapper canvas {
        width: 180px !important;
        height: 180px !important;
    }

    .controls-panel {
        padding: 30px 20px;
    }

    .modal-header h2 {
        font-size: 1.4rem;
        text-align: center;
        margin-bottom: 25px;
    }

    .input-field input {
        padding: 14px 16px;
        font-size: 16px;
    }

    .color-picker {
        justify-content: center;
        gap: 12px;
        margin-bottom: 30px;
    }

    .color-dot {
        width: 44px;
        height: 44px;
    }

    .modal-footer {
        flex-direction: column;
        gap: 12px;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 16px;
        order: 1;
    }

    .btn-secondary {
        order: 2;
        background: transparent;
    }

    .header-content {
        padding: 0 1.2rem;
    }

    .logo-text {
        font-size: 1rem;
    }

    .nav-links {
        gap: 15px;
    }

    .nav-links a {
        font-size: 0.8rem;
        text-decoration: none;
    }

}

@media (max-width: 380px) {
    .hero-section h1 {
        font-size: 1.7rem;
    }

    .qr-canvas-wrapper canvas {
        width: 150px !important;
        height: 150px !important;
    }
}