:root {
    --bg-color: #f8fafc; /* Subtle off-white / light slate background */
    --card-bg: #ffffff; /* Pure white card */
    --card-border: #e2e8f0; /* Ultra-thin border */
    --text-main: #0f172a; /* Slate 900 */
    --text-muted: #64748b; /* Slate 500 */
    --input-bg: #f8fafc; /* Form control default grey */
    --input-border: #e2e8f0;
    --primary-color: #0f172a; /* Slate 900 */
    --primary-hover: #1e293b; /* Slate 800 */
    --focus-ring: rgba(15, 23, 42, 0.15);
    --transition-speed: 0.2s;
    --orcid-color: #a6ce39; /* ORCID Signature Green */
    --orcid-color-hover: #96ba30;
}
body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}
/* Minimalist Card Container */
.login-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 3.5rem 3rem 2rem 3rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.02), 0 8px 16px -6px rgba(0, 0, 0, 0.02);
    transition: all 0.3s ease;
}
/* Logo Design */
.brand-logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.5px;
    user-select: none;
}
.brand-logo sub {
    font-size: 8px !important;
    font-weight: 400;
}
.form-label {
    font-weight: 600;
    font-size: .9rem;
    padding-left: 5px;
}
.form-floating > .form-control {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    border-radius: 12px;
}
.form-floating > .form-control:focus {
    background-color: #ffffff;
    border-color: var(--text-main);
    box-shadow: 0 0 0 4px var(--focus-ring);
    color: var(--text-main);
}
.form-floating > label {
    color: var(--text-muted);
    transition: all var(--transition-speed) ease;
}
.form-floating > .form-control:focus ~ label, .form-floating > .form-control:not(:placeholder-shown) ~ label {
    color: var(--text-main);
    transform: scale(0.85) translateY(-0.75rem) translateX(0.15rem);
}
.form-control, .form-select {
    font-size: 1rem;
}
/* Password Toggle Icon Alignment */
.password-wrapper {
    position: relative;
}
.password-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    z-index: 10;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: color var(--transition-speed);
}
.password-toggle:hover {
    color: var(--text-main);
}
/* Checkbox Style */
.form-check-input {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    cursor: pointer;
}
.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}
.form-check-input:focus {
    box-shadow: 0 0 0 4px var(--focus-ring);
    border-color: var(--text-main);
}
/* Minimalist Deep Dark Button */
.btn-minimal {
    background-color: var(--primary-color);
    border: none;
    color: #ffffff;
    font-weight: 500;
    border-radius: 12px;
    padding: 0.85rem 1.5rem;
    transition: all var(--transition-speed) ease;
}
.btn-minimal:hover {
    background-color: var(--primary-hover);
    color: #ffffff;
}
.btn-minimal:active {
    transform: scale(0.99);
}
/* ORCID Authentication Button */
.orcid-btn-login {
    background-color: #ffffff;
    border: 1px solid var(--input-border);
    color: var(--text-main);
    border-radius: 12px;
    padding: 0.85rem 1.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-speed) ease;
    width: 100%;
}
.orcid-btn-login:hover {
    background-color: #fcfdf7; /* Subtle ORCID green tint background */
    border-color: #a6ce39; /* ORCID Green border */
    color: var(--text-main);
}
.orcid-btn-login:active {
    transform: scale(0.99);
}
.orcid-icon-login {
    width: 20px;
    height: 20px;
}
/* Divider styling */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin: 1.75rem 0;
    letter-spacing: 0.5px;
}
.divider::before, .divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--card-border);
}
.divider:not(:empty)::before {
    margin-right: 1em;
}
.divider:not(:empty)::after {
    margin-left: 1em;
}
/* Autofill Overrides for Chrome and Safari */
input:-webkit-autofill, input:-webkit-autofill:hover, input:-webkit-autofill:focus {
    -webkit-text-fill-color: var(--text-main) !important;
    -webkit-box-shadow: 0 0 0px 1000px #ffffff inset !important;
    border: 1px solid var(--input-border) !important;
    transition: background-color 5000s ease-in-out 0s;
}
.lisans {
    text-align: center;
    line-height: 22px;
    font-size: 0.8rem;
    color: #555;
}
.lisans a {
    color: #444;
    font-weight: 500;
}
.nokta {
    list-style: none;
    padding: 0;
    display: inline;
}
.nokta li {
    display: inline;
}
.nokta li:not(:last-child)::after {
    content: "\2022";
    margin: 0 5px;
}
/* Wide Responsive Card for Registration */
.register-container {
    width: 100%;
    max-width: 800px;
}
/* Header & Back Button */
.header-row {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    margin-bottom: 2.5rem;
}
.btn-back {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 42px;
    height: 42px;
    background-color: #ffffff;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
    text-decoration: none;
}
.btn-back:hover {
    background-color: var(--input-bg);
    border-color: #cbd5e1;
    color: var(--text-main);
    transform: translateY(-50%) translateX(-2px);
}
/* ORCID Integration Block */
.orcid-note {
    background-color: #fcfdf7; /* Very soft greenish tint */
    border: 1px solid rgba(166, 206, 57, 0.25);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}
.orcid-note.matched {
    background-color: #f4fbf7; /* Very soft green success tint */
    border-color: rgba(16, 185, 129, 0.25);
}
.orcid-title-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0.75rem;
}
.orcid-icon {
    width: 22px;
    height: 22px;
}
.orcid-btn-group {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0 0;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.orcid-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-speed);
}
.orcid-btn-connect i {
    color: #ffffff;
}
.orcid-btn-connect {
    background-color: var(--orcid-color);
    color: #ffffff;
    border: 1px solid var(--orcid-color);
}
.orcid-btn-connect:hover {
    background-color: var(--orcid-color-hover);
    border-color: var(--orcid-color-hover);
    color: #ffffff;
}
.orcid-btn-outline {
    background-color: #ffffff;
    color: var(--text-main);
    border: 1px solid var(--card-border);
}
.orcid-btn-outline:hover {
    background-color: var(--input-bg);
    border-color: #cbd5e1;
    color: var(--text-main);
}
.dikkat {
    color: #F00;
    display: none;
    font-size: 11px;
    padding: 5px;
}