:root {
    /* Light Theme (Default) */
    --bg-color: #f3f2f1;
    --surface-color: #ffffff;
    --acrylic-bg-color: rgba(255, 255, 255, 0.85);
    --border-color: #e1dfdd;
    --subtle-border-color: #ebebeb;
    --text-primary: #1c1c1c;
    --text-secondary: #5f5f5f;
    --accent-color: #0078D4;
    --accent-color-hover: #106EBE;
    --accent-color-active: #005A9E;
    --accent-color-soft: #C7E0F4;
    --danger-color: #D83B01;
    --success-color: #107C10;
    --font-family: "Segoe UI", "Segoe UI Web (West European)", "Helvetica Neue", sans-serif;
}

/* --- DARK THEME --- */
body[data-theme="dark"] :root {
    --bg-color: #201f1e;
    --surface-color: #2d2c2b;
    --acrylic-bg-color: rgba(45, 44, 43, 0.9);
    --border-color: #403f3e;
    --subtle-border-color: #3b3a39;
    --text-primary: #ffffff;
    --text-secondary: #a19f9d;
    --accent-color: #1094F1;
    --accent-color-hover: #3da2f4;
    --accent-color-active: #005A9E;
    --accent-color-soft: #1a3651;
    --danger-color: #F0776C;
    --success-color: #63c763;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUpIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

html, body { height: 100%; margin: 0; overflow: hidden; }

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    padding: 1.5rem;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.4s ease-out;
}

.container {
    width: 100%;
    height: 100%;
    max-width: 1400px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    display: grid;
    grid-template-rows: auto 1fr auto;
    grid-template-columns: 1fr 350px;
    gap: 0 2.5rem;
}

.main-content, .sidebar, header { padding: 0 2.5rem; }

header {
    grid-column: 1 / -1;
    padding-top: 2.5rem;
    padding-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}
.header-main h1 { margin: 0 0 0.25rem 0; font-weight: 600; font-size: 2em; }
.header-main p { margin: 0; color: var(--text-secondary); }
.header-actions a { color: var(--accent-color); text-decoration: none; font-weight: 600; }
.header-actions a:hover { text-decoration: underline; }

.header-actions .btn-secondary { border-color: var(--border-color); }
.header-actions .btn-secondary:not(:disabled):hover { background-color: var(--subtle-border-color); border-color: var(--border-color); }


.controls-grid { display: flex; gap: 1rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }
.control-step { flex: 1; }

.btn {
    font-family: var(--font-family); font-size: 14px; font-weight: 600;
    padding: 10px 20px; border-radius: 4px; border: 1px solid var(--border-color);
    cursor: pointer; transition: all 0.2s ease; display: flex;
    align-items: center; justify-content: center; gap: 0.7em;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { cursor: not-allowed; opacity: 0.6; background-color: var(--bg-color) !important; color: var(--text-secondary) !important; border-color: var(--border-color) !important; box-shadow: none !important; }
.btn-primary { background-color: var(--accent-color); color: white; border-color: var(--accent-color); }
.btn-primary:not(:disabled):hover { background-color: var(--accent-color-hover); border-color: var(--accent-color-hover); box-shadow: 0 2px 8px rgba(0,120,212,0.3); }
.btn-secondary { background-color: var(--surface-color); color: var(--text-primary); }
.btn-secondary:not(:disabled):hover { background-color: #f8f8f8; border-color: #c8c6c4; }

input[type="file"] { display: none; }
.key-status { font-size: 12px; color: var(--text-secondary); height: 1.5em; text-align: center; margin-bottom: 0.5rem; }
.key-status .fa-check-circle { color: var(--success-color); }

textarea {
    width: 100%; flex-grow: 1; border: 1px solid #8A8886; border-radius: 4px; padding: 12px;
    font-size: 14px; resize: none; margin-bottom: 1.5rem; font-family: var(--font-family);
    transition: border-color 0.2s ease, box-shadow 0.2s ease; box-sizing: border-box;
}
textarea:focus { border-color: var(--accent-color); outline: none; box-shadow: 0 0 0 2px var(--accent-color-soft); }

.section-header { font-weight: 600; font-size: 16px; margin: 0 0 1em 0; }
.list-wrapper { flex-grow: 1; overflow-y: auto; margin-bottom: 1.5rem; min-height: 100px; scrollbar-width: thin; scrollbar-color: #c8c6c4 transparent; }
#fileList, #historyList { list-style: none; padding: 0; margin: 0; }
#fileList li { padding: 10px 12px; border-radius: 4px; margin-bottom: 4px; display: flex; justify-content: space-between; align-items: center; cursor: pointer; transition: background-color 0.15s; border-left: 3px solid transparent; }
#fileList li:hover { background-color: var(--subtle-border-color); }
#fileList li.selected {
    background-color: var(--accent-color-soft);
    border-left-color: var(--accent-color);
    font-weight: 600;
}
.file-actions .icon-btn { background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1em; transition: color 0.15s, background-color 0.15s; padding: 0.5em; border-radius: 4px; margin-left: 4px; }
.file-actions .icon-btn:hover { color: var(--danger-color); background-color: #fde8e8; }
.file-actions .download-btn { color: var(--accent-color); background-color: var(--accent-color-soft); }
.file-actions .download-btn:hover { color: white; background-color: var(--accent-color); }
#historyList li { display: block; background-color: var(--subtle-border-color); font-size: 12px; padding: 10px; border-radius: 4px; margin-bottom: 4px; border: 1px solid var(--border-color); }

.status-bar {
    grid-column: 1 / -1;
    grid-row: 3 / 4;
    padding: 12px 2.5rem;
    font-size: 13px;
    background: var(--subtle-border-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#statusMessage { color: var(--text-secondary); }
#dateTimeDisplay {
    font-family: monospace, sans-serif;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.4); display: none; justify-content: center; align-items: center; z-index: 1000; animation: fadeIn 0.2s ease-out; }
.modal-content { background: var(--acrylic-bg-color); backdrop-filter: blur(30px) saturate(180%); border: 1px solid rgba(255, 255, 255, 0.2); padding: 2rem; border-radius: 8px; width: 420px; box-shadow: 0 16px 40px rgba(0,0,0,0.2); animation: slideUpIn 0.3s ease-out; box-sizing: border-box; }
.modal-content h2 { margin-top: 0; }
.modal-content input[type="text"], .modal-content input[type="password"] { width: 100%; padding: 10px; margin-bottom: 1rem; border-radius: 4px; border: 1px solid #8A8886; box-sizing: border-box; font-size: 14px; }
.modal-content input:focus { border-color: var(--accent-color); outline: none; box-shadow: 0 0 0 2px var(--accent-color-soft); }
.modal-buttons { display: flex; justify-content: flex-end; gap: 1rem; margin-top: 1.5rem; }

.passcode-toggle { display: flex; align-items: center; gap: 0.5em; margin-bottom: 1rem; }
.auth-method-toggle { margin-bottom: 1rem; display: flex; gap: 20px; align-items: center; }
.auth-method-toggle label { cursor: pointer; display: flex; align-items: center; gap: 5px; font-size: 14px; }


/* Size Error Overlay */
#sizeErrorOverlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(30, 30, 30, 0.9); color: white;
    display: none; justify-content: center; align-items: center;
    text-align: center; z-index: 9999; animation: fadeIn 0.3s;
}
#sizeErrorOverlay .message-box { background: var(--surface-color); color: var(--text-primary); padding: 2.5rem; border-radius: 8px; max-width: 450px; box-shadow: 0 8px 32px rgba(0,0,0,0.2); }
#sizeErrorOverlay h2 { color: var(--danger-color); margin-top: 0; }

/* Passcode Input Styles */
.passcode-label { font-size: 0.9em; font-weight: 600; color: var(--text-secondary); margin: 1.5rem 0 0.5rem 0; }
.passcode-input-container { display: flex; justify-content: center; gap: 10px; }
.passcode-input {
    width: 40px; height: 50px; text-align: center; font-size: 1.5em;
    border-radius: 4px; border: 1px solid #8A8886;
    -webkit-text-security: disc; -moz-text-security: disc; text-security: disc;
}
.passcode-input:focus { border-color: var(--accent-color); outline: none; box-shadow: 0 0 0 2px var(--accent-color-soft); }

/* Error Help Modal Styles */
.table-wrapper { max-height: 40vh; overflow-y: auto; border: 1px solid var(--border-color); border-radius: 4px; margin-top: 1em; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px; text-align: left; border-bottom: 1px solid var(--border-color); }
th { background-color: var(--subtle-border-color); font-weight: 600; }
td:first-child { font-weight: bold; color: var(--danger-color); }
tbody tr:last-child td { border-bottom: none; }