/* --- Global Styles & Variables --- */
:root {
    --primary-color: #0056b3;
    --primary-hover: #004494;
    --success-color: #1a7431;
    --success-hover: #155d27;
    --text-color: #333;
    --light-gray: #f4f7fa;
    --border-color: #d1d9e6;
    --white-color: #ffffff;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
}

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

body {
    font-family: 'Noto Sans Lao', sans-serif;
    background-color: var(--light-gray);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

/* --- Main Layout --- */
.main-container {
    width: 100%;
    max-width: 480px;
    margin: auto;
}

.card {
    background: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    width: 100%;
    display: flex;
    flex-direction: column;
}

.card-header {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, #fdfdff, #f1f3f6);
    border-bottom: 1px solid var(--border-color);
}

.header-logo {
    width: 90px;
    height: auto;
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}
.header-logo:hover {
    transform: scale(1.05);
}

.card-header h1 {
    font-size: clamp(1rem, 4.2vw, 1.25rem);
    white-space: normal; /* ແກ້ໄຂ: ອະນຸຍາດໃຫ້ຂໍ້ຄວາມຕັດແຖວ */
    max-width: 100%;
    font-weight: 700;
    color: #002d5b;
    line-height: 1.4; /* ເພີ່ມ: ໄລຍະຫ່າງລະຫວ່າງແຖວເພື່ອให้อ่านง่าย */
}

.card-header p {
    font-size: 0.9rem;
    color: #667;
    margin-top: 0.25rem;
}

.card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* --- Form Elements --- */
.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#text-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s ease;
}
#text-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.2);
}

.file-input-wrapper {
    position: relative;
    width: 100%;
}

#logo-input {
    opacity: 0;
    position: absolute;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

#file-name-display {
    display: block;
    width: 100%;
    padding: 0.75rem;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    color: #555;
    background-color: #fafafa;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: background-color 0.2s ease;
}
#file-name-display:hover {
    background-color: #f0f0f0;
}

.clear-btn {
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #999;
    cursor: pointer;
    display: none; /* Hidden by default */
}
.clear-btn:hover {
    color: #333;
}

/* --- Buttons --- */
.btn {
    width: 100%;
    padding: 0.85rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    font-family: 'Noto Sans Lao', sans-serif;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.btn:active {
    transform: translateY(0);
    box-shadow: none;
}
.btn-primary {
    background-color: var(--primary-color);
    color: var(--white-color);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}
.btn-success {
    background-color: var(--success-color);
    color: var(--white-color);
}
.btn-success:hover {
    background-color: var(--success-hover);
}

/* --- Result Section --- */
.result-section {
    display: none; /* Hidden by default */
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: #f9fafb;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

#qrcode-canvas {
    padding: 0.5rem;
    background: var(--white-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#qrcode-canvas canvas {
    display: block;
}

/* --- Footer & Social Links --- */
.card-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: #f9fafb;
}

.social-links-inline {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links-inline a {
    font-size: 1.5rem;
    color: #556;
    text-decoration: none;
    transition: transform 0.3s ease, color 0.3s ease;
}

.social-links-inline a:hover {
    color: var(--primary-color);
    transform: scale(1.2);
}

.copyright-text {
    font-size: 0.8rem;
    color: #889;
    text-align: center;
}


/* --- Toast Notification --- */
#toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: bottom 0.5s ease-in-out;
}
#toast.show {
    bottom: 20px;
}