:root {
    /* Color Palette - Elegant Dark Theme */
    --color-bg-primary: #0f0a1e;
    --color-bg-secondary: #1a0f2e;
    --color-bg-tertiary: #251a3d;
    --color-surface: rgba(255, 255, 255, 0.05);
    --color-surface-hover: rgba(255, 255, 255, 0.08);

    /* Accent Colors */
    --color-accent-primary: hsl(280, 85%, 65%);
    --color-accent-secondary: hsl(200, 85%, 60%);
    --color-accent-gradient: linear-gradient(135deg, hsl(280, 85%, 65%), hsl(200, 85%, 60%));

    /* Text Colors */
    --color-text-primary: rgba(255, 255, 255, 0.95);
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-tertiary: rgba(255, 255, 255, 0.5);

    /* Status Colors */
    --color-error: hsl(0, 85%, 65%);
    --color-success: hsl(140, 70%, 60%);

    /* Layout */
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --spacing-unit: 8px;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', serif;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    background: var(--color-bg-primary);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(138, 43, 226, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(30, 144, 255, 0.1) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* QR Scan Instructions Screen */
.scan-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-unit);
}

.scan-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 6);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--glass-shadow);
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-section {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 5);
}

.rings-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto calc(var(--spacing-unit) * 3);
    color: var(--color-accent-primary);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.app-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.app-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 300;
}

/* Scan Instructions */
.scan-instructions {
    text-align: center;
}

.qr-placeholder {
    width: 150px;
    height: 150px;
    margin: 0 auto calc(var(--spacing-unit) * 4);
    padding: calc(var(--spacing-unit) * 2);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 2px dashed var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent-primary);
    animation: pulse 2s ease-in-out infinite;
}

.qr-placeholder svg {
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.scan-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text-primary);
}

.scan-text {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: calc(var(--spacing-unit) * 4);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.scan-steps {
    display: flex;
    justify-content: space-around;
    gap: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.scan-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1);
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.scan-step p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.scan-hint {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    font-style: italic;
}

/* Form Styles */
.login-form {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 3);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1);
}

.form-group label {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    padding: calc(var(--spacing-unit) * 2);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(138, 43, 226, 0.1);
}

.form-group input::placeholder {
    color: var(--color-text-tertiary);
}

/* Button Styles */
.btn {
    position: relative;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    border: none;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    overflow: hidden;
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(138, 43, 226, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(138, 43, 226, 0.4);
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-text {
    display: inline-block;
}

.btn-loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.btn-primary:disabled .btn-text {
    display: none;
}

.btn-primary:disabled .btn-loader {
    display: inline-block;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.btn-icon {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    padding: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Error Message */
.error-message {
    color: var(--color-error);
    font-size: 0.875rem;
    padding: calc(var(--spacing-unit) * 2);
    background: rgba(255, 0, 0, 0.1);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 0, 0, 0.2);
    display: none;
}

.error-message:not(:empty) {
    display: block;
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

/* App Header */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 10, 30, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 3);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-title {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Upload Section */
.upload-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 3);
}

.drop-zone {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 6);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.drop-zone:hover {
    border-color: var(--color-accent-primary);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.drop-zone.dragging {
    border-color: var(--color-accent-secondary);
    background: rgba(30, 144, 255, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto calc(var(--spacing-unit) * 3);
    color: var(--color-accent-primary);
}

.drop-zone-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.drop-zone-text {
    color: var(--color-text-secondary);
    font-size: 1rem;
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.drop-zone-hint {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* Upload Progress */
.upload-progress {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 3);
}

.upload-progress.hidden {
    display: none;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-accent-gradient);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

/* Gallery Section */
.gallery-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 3);
}

.gallery-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.gallery-title {
    font-size: 1.75rem;
    font-weight: 600;
}

.gallery-controls {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
}

.party-filter {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.party-filter:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-accent-primary);
}

.party-filter:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(138, 43, 226, 0.1);
}

.image-count {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    background: rgba(255, 255, 255, 0.05);
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
    border-radius: calc(var(--border-radius-sm) / 2);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 3);
}

.gallery-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    background: var(--color-bg-tertiary);
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.gallery-item.hidden {
    display: none;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-item:hover .image-overlay {
    opacity: 1;
}

.image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent 50%);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    padding: calc(var(--spacing-unit) * 2);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.image-filename {
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    width: 100%;
}

.image-uploader {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.75rem;
    margin-top: calc(var(--spacing-unit) * 0.5);
}

/* Gallery States */
.gallery-loader {
    text-align: center;
    padding: calc(var(--spacing-unit) * 8) 0;
    color: var(--color-text-secondary);
}

.loader {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    margin: 0 auto calc(var(--spacing-unit) * 3);
    animation: spin 0.8s linear infinite;
}

.empty-state {
    text-align: center;
    padding: calc(var(--spacing-unit) * 8) 0;
    color: var(--color-text-tertiary);
}

.empty-state.hidden {
    display: none;
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin: 0 auto calc(var(--spacing-unit) * 3);
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-info {
    margin-top: calc(var(--spacing-unit) * 3);
    display: flex;
    gap: calc(var(--spacing-unit) * 3);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.lightbox-close,
.lightbox-nav {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: white;
    transition: all 0.3s ease;
}

.lightbox-close:hover,
.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.lightbox-close {
    top: calc(var(--spacing-unit) * 3);
    right: calc(var(--spacing-unit) * 3);
}

.lightbox-prev {
    left: calc(var(--spacing-unit) * 3);
}

.lightbox-next {
    right: calc(var(--spacing-unit) * 3);
}

.lightbox-close svg,
.lightbox-nav svg {
    width: 24px;
    height: 24px;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .login-card {
        padding: calc(var(--spacing-unit) * 4);
    }

    .scan-card {
        padding: calc(var(--spacing-unit) * 4);
    }

    .app-title {
        font-size: 1.75rem;
    }

    .scan-title {
        font-size: 1.5rem;
    }

    .scan-steps {
        flex-direction: column;
        gap: calc(var(--spacing-unit) * 2);
    }

    .qr-placeholder {
        width: 120px;
        height: 120px;
    }

    .step-icon {
        font-size: 2rem;
    }

    .header-title {
        font-size: 1.25rem;
    }

    .upload-section,
    .gallery-section {
        padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 2);
    }

    .drop-zone {
        padding: calc(var(--spacing-unit) * 4);
    }

    .drop-zone-title {
        font-size: 1.25rem;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: calc(var(--spacing-unit) * 2);
    }

    .gallery-title {
        font-size: 1.5rem;
    }

    .lightbox-nav {
        width: 40px;
        height: 40px;
    }

    .lightbox-nav svg {
        width: 20px;
        height: 20px;
    }

    .lightbox-prev {
        left: calc(var(--spacing-unit) * 2);
    }

    .lightbox-next {
        right: calc(var(--spacing-unit) * 2);
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .gallery-item .image-overlay {
        opacity: 1;
    }
}