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

:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --background-color: #F2F2F7;
    --card-background: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #8E8E93;
    --border-color: #E5E5EA;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 80px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */
.header {
    text-align: center;
    padding: 24px 16px;
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
}

.logo {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.date-display {
    font-size: 16px;
    color: var(--text-secondary);
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

/* Error Message */
.error-message {
    background-color: #FF3B30;
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    margin: 16px 0;
    text-align: center;
}

/* Email Count */
.email-count {
    padding: 12px 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Email List */
.email-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.email-card {
    background-color: var(--card-background);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s;
}

.email-card:hover {
    box-shadow: var(--shadow-hover);
}

.email-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.email-sender {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.email-date {
    font-size: 12px;
    color: var(--text-secondary);
}

.email-subject {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.email-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    opacity: 0.8;
}

.play-btn {
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    padding: 8px;
    transition: transform 0.2s;
}

.play-btn:hover {
    transform: scale(1.1);
}

.play-btn:active {
    transform: scale(0.95);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 12px 0;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 16px;
    color: var(--text-primary);
    font-size: 12px;
    transition: opacity 0.2s;
}

.nav-btn:hover {
    opacity: 0.7;
}

.nav-btn .icon {
    font-size: 24px;
}

.nav-btn .label {
    font-size: 12px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background-color: var(--card-background);
    border-radius: 16px;
    padding: 24px;
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 20px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 20px;
}

#dateInput {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 20px;
}

/* Search */
.search-input-container {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.search-input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
}

.search-results {
    margin-top: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.search-result-item {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
}

.search-result-item:hover {
    background-color: var(--background-color);
}

.search-result-item:last-child {
    border-bottom: none;
}

/* Responsive Design */
@media (max-width: 600px) {
    .logo {
        font-size: 28px;
    }

    .subtitle {
        font-size: 18px;
    }

    .email-subject {
        font-size: 16px;
    }

    .nav-btn .label {
        font-size: 10px;
    }

    .modal-content {
        padding: 20px;
    }
}

/* Full Text View Modal */
.full-text-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--card-background);
    z-index: 1001;
    overflow-y: auto;
    padding: 20px;
}

.full-text-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
}

.close-full-text {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow);
}