/* frontend/style.css */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --error-color: #dc3545;
    --highlight-color: #ffc107;
    --qq-color: #12b7f5;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --primary-color-rgb: 0, 123, 255;
    --secondary-color-rgb: 108, 117, 125;
    --primary-color-dark: #0056b3;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.7;
    padding-top: 30px;
    padding-bottom: 30px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden; /* 配合动画 */
}

header {
    text-align: center;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

header .subtitle {
    color: var(--secondary-color);
    font-size: 1.1em;
}

section {
    margin-bottom: 35px;
    padding: 25px;
    background-color: #fff;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

section h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
    display: inline-block;
    font-weight: 500;
}

.sponsor-info p {
    margin-bottom: 15px;
}

.highlight {
    background-color: var(--highlight-color);
    padding: 2px 5px;
    border-radius: 4px;
    font-weight: 500;
    color: #503e00;
}

.qq-group {
    color: var(--qq-color);
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}
.qq-group:hover {
    filter: brightness(90%);
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.qr-code-item {
    text-align: center;
    transition: transform 0.3s ease;
}
.qr-code-item:hover {
     transform: translateY(-5px);
}

.qr-code-item img {
    max-width: 250px;
    height: auto;
    display: block;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    padding: 5px;
    border-radius: var(--border-radius);
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.qr-code-item p {
    font-weight: 500;
    color: var(--secondary-color);
}

.sponsor-list ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 15px;
}

.sponsor-list li {
    background-color: #ffffff;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    padding: 15px;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid var(--primary-color);
    position: relative;
    overflow: hidden;
    opacity: 1;
    transform: translateY(0);
    cursor: pointer;
}

#past-sponsors-list li {
    border-top-color: var(--secondary-color);
    background-color: #fafafa;
}

.sponsor-list li:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.sponsor-list li::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom right, rgba(var(--primary-color-rgb), 0.05), transparent);
    pointer-events: none;
}

#past-sponsors-list li::before {
    background: linear-gradient(to bottom right, rgba(var(--secondary-color-rgb), 0.05), transparent);
}

.sponsor-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.sponsor-nickname {
    font-weight: 700;
    font-size: 1.1em;
    color: var(--primary-color);
    position: static;
    padding-bottom: 0;
    margin-bottom: 0;
    flex-grow: 1;
    word-break: break-word;
    line-height: 1.2;
}

.sponsor-nickname::after {
    display: none;
}

.sponsor-days-left, .sponsor-duration {
    font-size: 0.85em;
    color: var(--secondary-color);
    margin-left: 10px;
    flex-shrink: 0;
    text-align: right;
    white-space: nowrap;
}

.sponsor-details {
    display: none;
    margin-top: 5px;
    padding-top: 5px;
    border-top: 1px dashed var(--border-color);
    animation: fadeIn 0.3s ease-out;
}

.sponsor-list-item.expanded .sponsor-details {
    display: block;
}

.sponsor-details .date-row {
     display: flex;
     align-items: baseline;
     margin-bottom: 3px;
}

.sponsor-details .label {
     font-weight: 500;
     color: var(--text-color);
     margin-right: 5px;
     min-width: 70px;
     display: inline-block;
}

.sponsor-details span {
    color: var(--secondary-color);
    font-size: 0.9em;
}

.sponsor-list li.expired {
    border-top-color: var(--error-color);
    background-color: #fff4f4;
}
.sponsor-list li.expired .sponsor-nickname {
    color: var(--error-color);
}
.sponsor-list li.expired .sponsor-days-left {
    color: var(--error-color);
    font-weight: bold;
}

.header-fade-in {
    animation: fadeIn 1s ease-out;
}

.slide-up-fade-in {
    opacity: 0;
    animation: slideUpFadeIn 0.8s ease-out forwards;
}

.sponsor-progress-container {
    margin-bottom: 30px;
    padding: 10px 5px;
}

.progress-bar-background {
    height: 24px;
    background-color: #f0f3f6;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.progress-bar-foreground {
    height: 100%;
    width: 0%;
    background-color: var(--success-color);
    border-radius: 12px;
    transition: width 0.7s ease-out, background-color 0.5s ease;
    background-image: linear-gradient(45deg, rgba(255, 255, 255, .2) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .2) 50%, rgba(255, 255, 255, .2) 75%, transparent 75%, transparent);
    background-size: 1rem 1rem;
    animation: progressBarStripes 1s linear infinite;
}

@keyframes progressBarStripes {
    from { background-position: 1rem 0; }
    to { background-position: 0 0; }
}

.progress-text {
    text-align: center;
    margin-top: 12px;
    font-size: 1em;
    color: var(--secondary-color);
    font-weight: 500;
}

.empty-list-notice {
    text-align: center !important;
    padding: 30px 20px !important;
    color: var(--secondary-color);
    font-style: italic;
    border-top-color: var(--border-color) !important;
    grid-column: 1 / -1;
}

.empty-list-notice.error {
    color: var(--error-color);
    border-top-color: var(--error-color) !important;
}

.query-sponsor-section {
    background-color: #f9f9f9;
    border: 1px solid #e5e5e5;
}

.query-sponsor-section h2 {
    color: var(--success-color);
    border-bottom-color: var(--success-color);
}

.query-sponsor-section p {
    margin-bottom: 15px;
}

.query-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 15px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.query-form .form-group {
    width: 100%;
}
.query-form .form-group label {
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}


#query-email {
    padding: 12px 15px;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    font-size: 1em;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
}

#query-email:focus {
    border-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.2);
    outline: none;
}

#query-button {
    padding: 12px 25px;
    background-color: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.05em;
    font-weight: 500;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#query-button:hover {
    filter: brightness(90%);
    transform: translateY(-2px);
}

.query-result-area {
    margin-top: 20px;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    background-color: #fff;
    border-left: 5px solid var(--secondary-color);
    min-height: 50px;
    transition: all 0.3s ease;
    font-size: 1.05em;
    line-height: 1.6;
    display: none;
}

.query-result-area strong {
    font-weight: 700;
}

.query-result-area.found {
    border-left-color: var(--success-color);
    background-color: #e9f7ec;
    display: block;
}

.query-result-area.not-found {
    border-left-color: var(--error-color);
    background-color: #fdecea;
    color: var(--error-color);
    display: block;
}

.query-result-area.info {
    border-left-color: var(--primary-color);
    background-color: #e6f2ff;
    display: block;
}

.toggle-button {
    display: block;
    margin: 20px auto 10px auto;
    padding: 10px 25px;
    font-size: 0.95em;
    font-weight: 500;
    color: #fff;
    background-color: var(--primary-color, #007bff);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.toggle-button:hover {
    background-color: var(--primary-color-dark, #0056b3);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.toggle-button:active {
    transform: translateY(0px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.admin-panel {
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    margin-bottom: 35px;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.admin-panel h2 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 8px;
    display: inline-block;
    font-weight: 500;
}

#redeem-form { /* MODIFIED: Renamed from #admin-form */
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"] {
    padding: 12px 15px;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    font-size: 1em;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="password"]:focus,
.form-group input[type="number"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.2);
    outline: none;
}

/* Specific style for number input to remove spinners in some browsers if desired */
.form-group input[type="number"]::-webkit-outer-spin-button,
.form-group input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.form-group input[type="number"] {
  -moz-appearance: textfield; /* Firefox */
}

/* 【NEW】Style for the redemption code textarea */
.form-group textarea {
    padding: 12px 15px;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    font-size: 1em;
    font-family: 'Noto Sans SC', sans-serif;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
    min-height: 100px;
    resize: vertical;
    line-height: 1.6;
}

.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.2);
    outline: none;
}

/* 【MODIFIED】Unified button style for the redeem form */
#redeem-button {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.05em;
    font-weight: 500;
    transition: background-color 0.3s ease, transform 0.2s ease;
    align-self: flex-start;
}

#redeem-button:hover {
    background-color: var(--primary-color-dark);
    transform: translateY(-2px);
}

#redeem-button:disabled {
    background-color: #aaa;
    cursor: not-allowed;
    transform: none;
}

.admin-status-message {
    margin-top: 15px;
    font-weight: 500;
    padding: 10px;
    border-radius: var(--border-radius);
    display: none;
}

.admin-status-message.success {
    color: var(--success-color);
    background-color: #e9f7ec;
    border: 1px solid var(--success-color);
    display: block;
}

.admin-status-message.error {
    color: var(--error-color);
    background-color: #fdecea;
    border: 1px solid var(--error-color);
    display: block;
}
.admin-status-message.processing {
    color: var(--secondary-color);
    background-color: #eef0f2;
    border: 1px solid var(--secondary-color);
    display: block;
}

.loading-indicator {
    text-align: center;
    padding: 20px;
    color: var(--secondary-color);
    font-style: italic;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-bottom: 20px;
    color: var(--secondary-color);
    font-size: 0.9em;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUpFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }
    .qr-codes {
        flex-direction: column;
        align-items: center;
        gap: 25px;
    }
    .sponsor-list ul {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .sponsor-summary {
        flex-direction: column;
        align-items: flex-start;
        gap: 3px;
        margin-bottom: 8px;
    }
    .sponsor-nickname {
        font-size: 1.1em;
        margin-bottom: 0;
        text-align: left;
        width: 100%;
    }
    .sponsor-days-left, .sponsor-duration {
        font-size: 0.8em;
        margin-left: 0;
        text-align: left;
        width: 100%;
    }
    .sponsor-details {
        font-size: 0.9em;
         margin-top: 5px;
         padding-top: 5px;
    }
    .sponsor-details .date-row {
        margin-bottom: 2px;
    }
    .sponsor-details .label {
         min-width: 55px;
    }
    /* 【MODIFIED】Ensure buttons are full-width on mobile */
    #redeem-button,
    #query-button {
        align-self: stretch;
    }
}

@media (min-width: 600px) {
    .query-form {
        flex-direction: row;
        align-items: flex-end;
    }
    .query-form .form-group {
         flex-grow: 1;
    }
    #query-button {
        flex-shrink: 0;
        align-self: flex-end;
        margin-bottom: 0;
    }
    /* 【MODIFIED】Ensure button is left-aligned on desktop */
     #redeem-button {
        align-self: flex-start;
    }
}

/* Milestones / Horizontal Timeline Section Styling */
.milestones-section h2 {
    margin-bottom: 20px;
}

.horizontal-timeline-wrapper {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 10px 0 20px 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--border-color);
    background-color: var(--background-color);
    border-radius: var(--border-radius);
}

.horizontal-timeline-wrapper::-webkit-scrollbar {
    height: 10px;
}
.horizontal-timeline-wrapper::-webkit-scrollbar-track {
    background: #efefef;
    border-radius: 5px;
}
.horizontal-timeline-wrapper::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 5px;
    border: 2px solid #efefef;
}
.horizontal-timeline-wrapper::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary-color-dark);
}

.horizontal-timeline {
    display: flex;
    align-items: flex-start;
    position: relative;
    padding: 20px 15px;
    min-width: fit-content;
}

.horizontal-timeline::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 25px;
    right: 25px;
    height: 3px;
    background-color: var(--primary-color);
    z-index: 0;
}

.horizontal-timeline .timeline-item {
    display: flex;
    flex-direction: column;
    flex: 0 0 270px;
    margin: 0 12px;
    position: relative;
}

.horizontal-timeline .timeline-item:first-child {
    margin-left: 25px;
}
.horizontal-timeline .timeline-item:last-child {
    margin-right: 25px;
}

.horizontal-timeline .timeline-point {
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border: 3px solid var(--background-color);
    border-radius: 50%;
    z-index: 1;
    position: absolute;
    top: 22px;
    left: 50%;
    transform: translateX(-50%);
}

.horizontal-timeline .timeline-item-top {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding-bottom: 4px;
    margin-bottom: 36px;
}

.horizontal-timeline .timeline-date {
    font-size: 0.85em;
    color: var(--secondary-color);
    font-weight: 600;
    line-height: 1.3;
    text-align: center;
}

.horizontal-timeline .timeline-content {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--box-shadow);
    width: 100%;
    text-align: left;
    min-height: 80px;
}
.horizontal-timeline .timeline-content strong.highlight {
    /* Global .highlight styles apply */
}

@media (max-width: 480px) {
    .horizontal-timeline .timeline-item {
        flex-basis: 240px;
    }
    .horizontal-timeline .timeline-date {
        font-size: 0.8em;
    }
    .milestones-section h2 {
        font-size: 1.6em;
    }
}