/* --- Variables & Reset --- */
:root {
    --bg-color: #ffffff;
    --primary-blue: #267dff;
    --accent-yellow: #ffc900;
    --border-color: #000000;
    --text-color: #000000;
    --border-width: 3px;
    --shadow-offset: 6px;
}

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

body {
    font-family: 'Space Grotesk', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Typography --- */
h2 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

p { margin-bottom: 1.5rem; }

/* --- Navbar --- */
.navbar {
    border-bottom: var(--border-width) solid var(--border-color);
    background-color: var(--bg-color);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 1rem 2rem;
    display: flex; justify-content: space-between; align-items: center;
}
.nav-logo { height: 40px; }

/* --- Buttons --- */
.btn, .nav-btn {
    text-decoration: none; font-weight: 700; font-size: 1rem; color: var(--text-color);
    border: var(--border-width) solid var(--border-color);
    box-shadow: 4px 4px 0 var(--border-color);
    transition: all 0.15s ease-in-out; cursor: pointer;
    display: inline-block; padding: 0.75rem 1.5rem; text-align: center;
}
.nav-btn { padding: 0.5rem 1rem; font-size: 0.9rem; }
.btn-primary { background-color: var(--primary-blue); }
.btn-secondary { background-color: var(--bg-color); }
.btn-yellow { background-color: var(--accent-yellow); }
.btn-full { width: 100%; margin-top: 1rem; }

.btn:hover, .nav-btn:hover {
    transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--border-color);
}
.btn:active, .nav-btn:active {
    transform: translate(4px, 4px); box-shadow: 0px 0px 0 var(--border-color);
}

/* --- Registration Layout --- */
.register-container {
    flex: 1; display: flex; justify-content: center; align-items: center;
    padding: 4rem 2rem; background-color: #f8f8f8;
}
.register-box {
    background-color: var(--bg-color);
    border: var(--border-width) solid var(--border-color);
    padding: 3rem; width: 100%; max-width: 500px;
    box-shadow: 8px 8px 0 var(--border-color);
}
.badge {
    display: inline-block; background-color: var(--accent-yellow);
    border: 2px solid var(--border-color); padding: 0.2rem 0.6rem;
    font-weight: 700; font-size: 0.8rem; margin-bottom: 1rem;
    box-shadow: 2px 2px 0 var(--border-color);
}

/* --- Sliding Toggle Switch --- */
.auth-toggle {
    display: flex; position: relative; margin-bottom: 2rem;
    border: var(--border-width) solid var(--border-color);
    background-color: #f0f0f0; box-shadow: 4px 4px 0 var(--border-color);
}
.toggle-slider {
    position: absolute; top: 0; left: 0; width: 50%; height: 100%;
    background-color: var(--accent-yellow);
    border-right: var(--border-width) solid var(--border-color);
    transition: transform 0.35s cubic-bezier(0.25, 1, 0.5, 1); z-index: 1;
}
/* When in login mode, slide the yellow box to the right */
.auth-toggle.login-mode .toggle-slider {
    transform: translateX(100%); border-right: none;
    border-left: var(--border-width) solid var(--border-color);
}
.toggle-btn {
    flex: 1; padding: 0.8rem; text-align: center; font-weight: 700;
    font-size: 1rem; font-family: inherit; cursor: pointer;
    background: transparent; border: none; position: relative; z-index: 2;
}

/* --- Text Animation Utilities --- */
.text-transition {
    transition: opacity 0.25s ease, transform 0.25s ease;
    opacity: 1; transform: translateY(0);
}
.text-hidden {
    opacity: 0; transform: translateY(10px);
}

/* --- Forms --- */
.input-group { margin-bottom: 1.5rem; text-align: left; }
.input-group label { display: block; font-weight: 700; margin-bottom: 0.5rem; }
.input-group input {
    width: 100%; padding: 1rem; font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem; border: var(--border-width) solid var(--border-color);
    background-color: #fff; outline: none; transition: box-shadow 0.2s ease;
}
.input-group input:focus { box-shadow: 4px 4px 0 var(--primary-blue); }

/* --- Divider --- */
.divider { text-align: center; margin: 2rem 0; position: relative; }
.divider::before {
    content: ""; position: absolute; top: 50%; left: 0; right: 0;
    border-top: var(--border-width) solid var(--border-color); z-index: 1;
}
.divider span {
    background-color: var(--bg-color); padding: 0 1rem;
    position: relative; z-index: 2; font-weight: 700;
}

/* --- Alerts --- */
.alert {
    padding: 1rem; border: var(--border-width) solid var(--border-color);
    margin-bottom: 1.5rem; font-weight: 600; box-shadow: 3px 3px 0 var(--border-color);
}
.alert.hidden { display: none; }
.alert.error { background-color: #ff4d4d; color: white; }
.alert.success { background-color: #00cc66; color: white; }

/* --- Initial Page Reveal Animation --- */
.section-reveal {
    opacity: 0; transform: translateY(20px);
    animation: slideUp 0.5s ease-out forwards;
}
@keyframes slideUp { to { opacity: 1; transform: translateY(0); } }