:root {
    --primary: #1e3a8a;
    --primary-light: #eff6ff;
    --accent: #0284c7;
    --text: #1f2937;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --border: #cbd5e1;
    --radius: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text);
    padding-bottom: 40px;
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, #0f172a, var(--primary));
    color: white;
    padding: 20px 16px;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 1.3rem;
    margin-bottom: 4px;
}
header p {
    font-size: 0.85rem;
    opacity: 0.9;
}
.contact-info {
    font-size: 0.8rem;
    margin-top: 6px;
    font-weight: 500;
    color: #93c5fd;
}

nav {
    display: flex;
    background-color: white;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

nav button {
    flex: 1;
    padding: 14px 8px;
    border: none;
    background: none;
    font-weight: 600;
    font-size: 0.9rem;
    color: #64748b;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
}

nav button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background-color: var(--primary-light);
}

/* Container & Layout */
.container {
    padding: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.view {
    display: none;
}
.view.active {
    display: block;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 18px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card-title {
    font-size: 1rem;
    color: var(--primary);
    margin-bottom: 12px;
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Form Controls */
.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: #334155;
}

input[type="text"],
input[type="tel"],
input[type="date"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    background-color: #fff;
}

input:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

textarea {
    resize: vertical;
    min-height: 70px;
}

/* Checkboxes & Radios */
.checkbox-group,
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.checkbox-item,
.radio-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    background: #f1f5f9;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
}

.checkbox-item input,
.radio-item input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* Signature Canvas */
.signature-container {
    border: 2px dashed var(--border);
    border-radius: 8px;
    background: #fff;
    position: relative;
    touch-action: none;
    margin-top: 8px;
}

canvas {
    width: 100%;
    height: 150px;
    display: block;
    border-radius: 8px;
}

.btn-clear {
    position: absolute;
    right: 8px;
    top: 8px;
    background: #ef4444;
    color: white;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: scale(0.98);
}
.btn-secondary {
    background: #64748b;
    margin-top: 8px;
}

/* Terms Disclaimer */
.terms-text {
    font-size: 0.75rem;
    color: #64748b;
    line-height: 1.4;
    margin-bottom: 12px;
    text-align: justify;
    background: #f8fafc;
    padding: 10px;
    border-left: 3px solid var(--accent);
}

/* Admin Styles */
.patient-card-item {
    background: white;
    padding: 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.session-block {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
}

.session-block .session-num {
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.session-block label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: #334155;
    margin-bottom: 4px;
    margin-top: 8px;
}

.session-block label:first-of-type {
    margin-top: 0;
}

.signature-preview {
    max-width: 120px;
    max-height: 50px;
    object-fit: contain;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: #fff;
}