:root {
    --bg-color: #f8f9fa;
    --fg-color: #212529;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --card-bg: #ffffff;
    --subtle-text: #6c757d;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --success-color: #28a745;
    --font-family: 'Inter', sans-serif;
    --slow-transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
    font-family: var(--font-family);
    color: var(--fg-color);
    background-color: var(--bg-color);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
}
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    z-index: -1;
}
.main-container {
    width: 100%;
    max-width: 520px;
    animation: fadeIn 0.5s ease-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Profile Header */
.profile-header {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
    transition: var(--slow-transition);
}
.profile-header:hover {
    box-shadow: var(--shadow-md);
}
.banner img { width: 100%; height: 160px; object-fit: cover; display: block; }
.profile-info {
    position: relative;
    padding: 0 24px 24px;
    margin-top: -56px;
    text-align: center;
}
.pfp {
    width: 112px;
    height: 112px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--card-bg);
    box-shadow: var(--shadow-md);
    margin: 0 auto 12px;
}
.site-name { font-size: 28px; font-weight: 700; margin-bottom: 4px; }
.about-text { font-size: 16px; color: var(--subtle-text); line-height: 1.6; }
.header-buttons { display: flex; justify-content: center; gap: 12px; margin-top: 16px; }
.header-btn {
    text-decoration: none;
    color: var(--fg-color);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 14px;
    transition: var(--slow-transition);
    box-shadow: var(--shadow-sm);
}
.header-btn:hover { background-color: var(--bg-color); border-color: #adb5bd; box-shadow: var(--shadow); }
.header-btn:active { transform: scale(0.98); box-shadow: none; }

/* Tool Tabs */
.tool-tabs {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 24px;
}
.tab-buttons { display: flex; border-bottom: 1px solid var(--border-color); margin-bottom: 24px; }
.tab-btn {
    font-family: var(--font-family);
    font-size: 16px;
    font-weight: 500;
    color: var(--subtle-text);
    background: none;
    border: none;
    padding: 0 4px 12px;
    margin-right: 20px;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--slow-transition);
}
.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transition: var(--slow-transition);
}
.tab-btn.active { color: var(--fg-color); }
.tab-btn.active::after { transform: scaleX(1); }
.tool-section { display: none; animation: slideIn 0.4s ease-out; }
.tool-section.active { display: block; }
@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.tool-description { text-align: center; color: var(--subtle-text); margin-bottom: 20px; }

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--slow-transition);
}
.drop-zone.dragover { border-color: var(--accent-color); background-color: #f1f3f5; box-shadow: inset 0 2px 4px 0 rgba(0,0,0,0.06); }
.drop-zone-icon { color: var(--accent-color); margin-bottom: 12px; }
.drop-zone-text { font-size: 16px; font-weight: 500; color: var(--subtle-text); }
.drop-zone-text span { color: var(--accent-color); font-weight: 700; }
.drop-zone-subtext { font-size: 12px; color: var(--subtle-text); margin-top: 4px; }

/* Input Group & Action Button */
.input-group { display: flex; flex-direction: column; gap: 12px; margin-bottom: 20px; }
.input-group input {
    font-family: var(--font-family);
    background-color: #fff;
    border: 1px solid var(--border-color);
    color: var(--fg-color);
    padding: 12px 16px;
    border-radius: 8px;
    width: 100%;
    font-size: 14px;
    transition: var(--slow-transition);
    box-shadow: var(--shadow-sm);
}
.input-group input:focus { outline: none; border-color: var(--accent-color); box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1); }
.action-btn {
    font-family: var(--font-family);
    font-size: 16px;
    color: #fff;
    background-color: var(--accent-color);
    border: none;
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--slow-transition);
    box-shadow: var(--shadow);
}
.action-btn:hover { background-color: #0056b3; box-shadow: var(--shadow-md); }
.action-btn:active { transform: scale(0.98); box-shadow: var(--shadow-sm); }

/* Result Area */
.result-area { margin-top: 20px; min-height: 48px; display: flex; align-items: center; justify-content: center; opacity: 0; transform: translateY(10px); transition: opacity 0.3s ease-out, transform 0.3s ease-out; }
.result-area.visible { opacity: 1; transform: translateY(0); }
.result-area-content { display: flex; align-items: center; gap: 12px; background-color: var(--bg-color); padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border-color); width: 100%; cursor: pointer; position: relative; box-shadow: var(--shadow-sm); }
.result-url { font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--accent-color); font-weight: 500; text-decoration: none; }
.result-url:hover { text-decoration: underline; }
.result-area-content .copy-icon { width: 24px; height: 24px; flex-shrink: 0; color: var(--subtle-text); margin-left: auto; }
.result-area-content::after { content: 'Copied!'; position: absolute; top: 50%; right: 12px; transform: translateY(-50%); background-color: var(--success-color); color: white; padding: 4px 10px; border-radius: 5px; font-size: 12px; opacity: 0; pointer-events: none; transition: opacity 0.2s ease-out; }
.result-area-content.copied .copy-icon { display: none; }
.result-area-content.copied::after { opacity: 1; }
.loader { width: 32px; aspect-ratio: 1; border-radius: 50%; border: 4px solid var(--border-color); border-right-color: var(--accent-color); animation: l2 1s infinite linear; }
@keyframes l2 { to { transform: rotate(1turn) } }

/* History Section */
.history-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 24px;
    margin-top: 24px;
}
.history-section h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}
.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-color);
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    font-family: 'Ubuntu Mono', monospace;
}
.history-url {
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-decoration: none;
    color: var(--fg-color);
}
.history-url strong {
    color: var(--accent-color);
}
.more-btn {
    font-family: var(--font-family);
    width: 100%;
    margin-top: 16px;
    font-size: 14px;
    color: var(--accent-color);
    background: none;
    border: 1px solid transparent;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--slow-transition);
    font-weight: 500;
}
.more-btn:hover {
    background-color: rgba(0, 123, 255, 0.05);
    border-color: rgba(0, 123, 255, 0.1);
}
.more-btn:disabled {
    display: none;
}

/* Error Page */
body.error-page { display: flex; justify-content: center; align-items: center; }
.error-container { text-align: center; background-color: var(--card-bg); padding: 40px; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: var(--shadow-md); }
.error-container img { width: 120px; height: 120px; margin-bottom: 20px; }
.error-container span { font-size: 20px; font-weight: 500; }

/* Donation Section */
.donation-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 24px;
    margin-top: 24px;
}
.donation-section h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}
.donation-section .input-group {
    flex-direction: row;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease-out;
}
.modal-content {
    background-color: var(--card-bg);
    padding: 32px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
    width: 90%;
    max-width: 380px;
    animation: slideIn 0.3s ease-out;
}
.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    font-size: 28px;
    color: var(--subtle-text);
    cursor: pointer;
    line-height: 1;
}
.modal-content h3 {
    font-size: 22px;
    margin-bottom: 16px;
}
.qris-container {
    margin: 20px auto;
    width: 200px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}
#qris-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}
.modal-content p {
    margin: 8px 0;
    color: var(--subtle-text);
    font-size: 14px;
}
.modal-content p strong {
    color: var(--fg-color);
    font-weight: 700;
}
.download-btn {
    margin-top: 16px;
    text-decoration: none;
}