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

:root {
    --primary: #1976D2;
    --primary-dark: #1565C0;
    --accent: #FF6F00;
    --bg: #f5f5f5;
    --card-bg: #fff;
    --text: #212121;
    --text-secondary: #757575;
    --divider: #e0e0e0;
    --success: #4CAF50;
    --error: #F44336;
    --ripple: rgba(0,0,0,0.1);
}

body {
    font-family: 'Roboto', 'Segoe UI', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding-bottom: 80px;
}

.app-bar {
    background: var(--primary);
    color: #fff;
    padding: 16px;
    font-size: 20px;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 12px;
}

.app-bar .subtitle {
    font-size: 14px;
    font-weight: 400;
    opacity: 0.8;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    margin: 12px 16px;
    padding: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
}

.card h2 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--primary);
}

.card h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 8px;
    font-size: 16px;
    font-family: inherit;
    border: none;
    border-bottom: 2px solid var(--divider);
    background: transparent;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-bottom-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

.btn:active {
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-block {
    width: 100%;
    display: flex;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.upload-area {
    border: 2px dashed var(--divider);
    border-radius: 8px;
    padding: 32px 16px;
    text-align: center;
    color: var(--text-secondary);
    transition: border-color 0.2s, background 0.2s;
    cursor: pointer;
    margin-bottom: 16px;
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(25, 118, 210, 0.05);
}

.upload-area .icon {
    font-size: 48px;
    margin-bottom: 8px;
    display: block;
}

.upload-area .text {
    font-size: 16px;
}

.upload-area .subtext {
    font-size: 12px;
    margin-top: 4px;
}

.upload-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.upload-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.status-message {
    padding: 12px;
    border-radius: 4px;
    margin: 12px 16px;
    font-size: 14px;
    display: none;
}

.status-message.success {
    display: block;
    background: #E8F5E9;
    color: #2E7D32;
    border-left: 4px solid var(--success);
}

.status-message.error {
    display: block;
    background: #FFEBEE;
    color: #C62828;
    border-left: 4px solid var(--error);
}

.event-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 24px 16px;
    text-align: center;
}

.event-header h1 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 4px;
}

.event-header .date {
    font-size: 14px;
    opacity: 0.8;
}

.hidden { display: none; }

#auth-screen { margin-top: 60px; }
#upload-screen { margin-top: 0; }

.photo-preview {
    display: block;
    max-width: 100%;
    margin: 12px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.category-chip {
    display: inline-block;
    padding: 6px 12px;
    margin: 4px;
    background: #e3f2fd;
    color: var(--primary);
    border-radius: 16px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
    border: 2px solid transparent;
}

.category-chip.selected {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary-dark);
}

@media (min-width: 600px) {
    .card { max-width: 500px; margin: 12px auto; }
}