/**
 * Free QR Code Generator - Custom Stylesheet
 * Complements Bootstrap 5 with custom styling
 */

/* ==========================================
   CUSTOM VARIABLES & THEME
   ========================================== */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --color-dark-bg: #0f1419;
    --color-dark-secondary: #1e293b;
    --color-dark-tertiary: #172554;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --color-accent: #667eea;
    --color-accent-alt: #764ba2;
    --color-warning: #fbbf24;
}

/* ==========================================
   BODY & GENERAL STYLES
   ========================================== */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-dark-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* ==========================================
   NAVBAR & HEADER
   ========================================== */
.navbar {
    background: var(--primary-gradient) !important;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1030;
}

.navbar-brand {
    font-size: 1.3rem;
    letter-spacing: 0.5px;
    color: var(--color-text-primary) !important;
}

.navbar-brand i {
    color: var(--color-warning);
}

.nav-link {
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    color: var(--color-text-primary) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-warning);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* ==========================================
   HERO SECTION (DEPRECATED - KEPT FOR REFERENCE)
   ========================================== */
.hero-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #312e81 100%);
    padding: 3rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: none; /* Section removed from HTML */
}

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--color-warning), #fef3c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .main-title {
        font-size: 2rem;
    }
}

.main-description {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

/* ==========================================
   MAIN CONTENT
   ========================================== */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 400px);
}

/* ==========================================
   CONTROLS PANEL
   ========================================== */
.controls {
    background: linear-gradient(135deg, var(--color-dark-secondary) 0%, var(--color-dark-tertiary) 100%);
    border-radius: 12px;
    overflow: hidden;
}

.controls .card {
    background: linear-gradient(135deg, var(--color-dark-secondary) 0%, var(--color-dark-tertiary) 100%);
    transition: var(--transition);
}

.controls .card-title {
    color: var(--color-warning);
    font-size: 1.2rem;
}

.controls .card-title i {
    color: #f59e0b;
}

/* ==========================================
   FORM CONTROLS
   ========================================== */
.form-label {
    color: var(--color-text-primary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.form-label i {
    color: var(--color-accent);
}

.form-control,
.form-select {
    background-color: var(--color-dark-bg);
    border: 2px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 0.75rem;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--color-dark-secondary);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

.form-control-lg,
.form-select-lg {
    font-size: 1rem;
    padding: 0.85rem;
}

.form-range {
    height: 0.5rem;
    border-radius: 5px;
    background-color: var(--color-border);
}

.form-range::-webkit-slider-thumb {
    background: var(--primary-gradient);
    border: none;
    box-shadow: var(--shadow-md);
}

.form-range::-moz-range-thumb {
    background: var(--primary-gradient);
    border: none;
    box-shadow: var(--shadow-md);
}

.form-check-input {
    border: 2px solid var(--color-border);
    width: 1.25em;
    height: 1.25em;
    cursor: pointer;
    transition: var(--transition);
}

.form-check-input:checked {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.form-check-label {
    cursor: pointer;
    margin-bottom: 0;
    color: var(--color-text-secondary);
}

/* ==========================================
   COLOR INPUT
   ========================================== */
.form-control-color {
    cursor: pointer;
    border-radius: 8px;
    border: 2px solid var(--color-border) !important;
    height: 50px !important;
    padding: 4px !important;
    width: 100%;
    transition: var(--transition);
}

.form-control-color::-webkit-color-swatch {
    border-radius: 6px;
    border: none;
}

.form-control-color::-webkit-color-swatch-wrapper {
    padding: 0;
    border: none;
}

.form-control-color:focus {
    border-color: var(--color-accent) !important;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1) !important;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    border: none;
    padding: 0.6rem 1.2rem;
}

.btn-primary,
.btn-gradient {
    background: var(--primary-gradient);
    border: none;
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover,
.btn-gradient:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
    color: #fff;
}

.btn-primary:active,
.btn-gradient:active {
    transform: translateY(-1px);
}

.btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1.1rem;
}

.btn-outline-primary {
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
}

.btn-outline-primary:hover {
    background-color: var(--color-accent);
    color: #fff;
    transform: translateY(-2px);
}

.btn-outline-danger {
    border: 2px solid #ef4444;
    color: #ef4444;
}

.btn-outline-danger:hover {
    background-color: #ef4444;
    color: #fff;
}

.btn-outline-success {
    border: 2px solid #10b981;
    color: #10b981;
}

.btn-outline-success:hover {
    background-color: #10b981;
    color: #fff;
}

.copy-btn {
    cursor: pointer;
    transition: var(--transition);
}

.hidden {
    display: none !important;
}

/* ==========================================
   PREVIEW AREA
   ========================================== */
.preview-area {
    background: linear-gradient(135deg, var(--color-dark-secondary) 0%, var(--color-dark-tertiary) 100%);
    border-radius: 12px;
    min-height: 500px;
    z-index: 10;
}

.preview-area .card {
    background: linear-gradient(135deg, var(--color-dark-secondary) 0%, var(--color-dark-tertiary) 100%);
}

.preview-body {
    max-height: 600px;
    overflow: auto;
}

#qr-code-container {
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    animation: fadeIn 0.3s ease-in;
    max-width: 100%;
    max-height: 100%;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    transform-origin: center bottom;
    will-change: transform;
}

.preview-area:hover #qr-code-container {
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.2);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ==========================================
   FEATURES SECTION
   ========================================== */
.features-section {
    background: linear-gradient(135deg, #111827 0%, var(--color-dark-bg) 100%);
    padding: 4rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.features-section h2 {
    color: var(--color-warning);
    font-size: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: linear-gradient(135deg, var(--color-dark-secondary) 0%, var(--color-dark-tertiary) 100%);
    border-radius: 12px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.3);
}

.feature-card h5 {
    color: var(--color-warning);
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-card i {
    transition: var(--transition);
}

.feature-card:hover i {
    transform: scale(1.2) rotate(5deg);
}

.hover-lift {
    transition: var(--transition);
}

.hover-lift:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

/* ==========================================
   MODAL
   ========================================== */
.modal-content {
    background: linear-gradient(135deg, var(--color-dark-secondary) 0%, var(--color-dark-tertiary) 100%);
    border-radius: 12px;
}

.modal-header {
    background: var(--primary-gradient);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-title {
    color: var(--color-warning);
    font-weight: 600;
    font-size: 1.3rem;
}

.modal-title i {
    color: #ff69b4;
}

.btn-close-white {
    filter: invert(1) grayscale(100%) brightness(200%);
}

.modal-body {
    padding: 2rem;
    color: var(--color-text-primary);
}

.modal-body h6 {
    color: var(--color-warning);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
}

.modal-body h6 i {
    margin-right: 0.5rem;
}

.modal-body p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ==========================================
   WALLET CARDS (DONATION)
   ========================================== */
.wallet {
    background: linear-gradient(135deg, var(--color-dark-bg) 0%, var(--color-dark-secondary) 100%);
    transition: var(--transition);
    border-radius: 12px !important;
    overflow: hidden;
}

.wallet:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.3) !important;
}

.wallet h6 {
    color: var(--color-warning);
    font-weight: 600;
    margin-bottom: 1rem;
}

.wallet img {
    transition: var(--transition);
    border-radius: 10px !important;
}

.wallet:hover img {
    transform: scale(1.05);
}

.wallet .address {
    color: var(--color-text-muted);
    font-family: "Courier New", monospace;
    font-size: 0.7rem;
    line-height: 1.4;
}

/* ==========================================
   PROJECT CARD
   ========================================== */
.project-card {
    background: linear-gradient(135deg, var(--color-dark-bg) 0%, var(--color-dark-secondary) 100%) !important;
    border-radius: 12px !important;
    transition: var(--transition);
}

.project-card h6 {
    color: var(--color-warning);
    font-weight: 600;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2) !important;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a2e 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer a {
    transition: var(--transition);
}

.footer a:hover {
    color: #fbbf24 !important;
}

.footer .text-danger {
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    25% {
        transform: scale(1.1);
    }
    50% {
        transform: scale(1.2);
    }
    75% {
        transform: scale(1.1);
    }
}

/* ==========================================
   BADGES & UTILITIES
   ========================================== */
.badge {
    border-radius: 8px;
    padding: 0.4rem 0.8rem;
    font-weight: 600;
    font-size: 0.85rem;
}

.bg-gradient {
    background: var(--primary-gradient) !important;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 992px) {
    .preview-area {
        position: relative !important;
        top: auto !important;
        margin-top: 2rem;
    }

    .controls .card {
        margin-bottom: 2rem;
    }

    .hero-section .main-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
    }

    .hero-section .main-title {
        font-size: 1.75rem;
    }

    .hero-section .main-description {
        font-size: 1rem;
    }

    .features-section h2 {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }

    .feature-card {
        padding: 2rem 1.5rem !important;
    }

    .feature-card h5 {
        font-size: 1rem;
    }

    .feature-card i {
        font-size: 2.5rem !important;
    }

    .main-content {
        padding: 1rem 0;
    }

    #qr-code-container {
        padding: 1rem;
    }

    .preview-area {
        min-height: 400px;
    }

    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }

    .form-control-lg,
    .form-select-lg {
        font-size: 0.95rem;
        padding: 0.65rem;
    }

    .modal-body {
        padding: 1.5rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 1.5rem 0;
    }

    .hero-section .main-title {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }

    .hero-section .main-description {
        font-size: 0.95rem;
    }

    .controls .card-body {
        padding: 1.5rem !important;
    }

    .feature-card {
        padding: 1.5rem 1rem !important;
    }

    .feature-card i {
        font-size: 2rem !important;
    }

    .feature-card h5 {
        font-size: 0.9rem;
    }

    .feature-card .card-text {
        font-size: 0.85rem;
    }

    .d-grid {
        gap: 1rem !important;
    }

    .modal-lg {
        max-width: 95vw;
    }

    .wallet {
        padding: 1.5rem !important;
    }

    .address {
        font-size: 0.65rem !important;
    }

    .btn-sm {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .navbar-brand {
        font-size: 1.1rem;
    }

    .nav-link {
        font-size: 0.95rem;
    }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
.btn:focus-visible,
.form-control:focus-visible,
.form-select:focus-visible,
.nav-link:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* ==========================================
   DARK MODE ENHANCEMENTS
   ========================================== */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #0f1419;
    }

    .form-control,
    .form-select {
        background-color: #1a2332;
        border-color: #334155;
    }
}